Everyday Math
MAD Calculator
Find mean absolute deviation, the average, and a complete deviation table.
YOUR PRACTICAL TOOLKIT
Find your calculator.
Search the calculator library, browse by topic, or keep your favorites bookmarked on this device.
270 tools availableNo account required
Statistics
Binomial Distribution Calculator
Calculate exact, cumulative, at-least, and between probabilities.
Everyday Math
Integer Calculator
Add, subtract, multiply, and divide signed integers with exact results.
Geometry
Reflection Calculator
Reflect points across an axis, a diagonal, or a custom straight line.
Everyday Math
Squaring Calculator
Square a number or fraction and see the exact multiplication.
Everyday Math
Adding Decimals Calculator
Add multiple decimals exactly, with aligned place-value working.
Everyday Math
Square Root Simplifier
Turn a whole-number square root into its simplest radical form.
Geometry
Rotation Calculator
Rotate coordinate points around any center, with a visual comparison.
Everyday Math
Reciprocal Calculator
Find the reciprocal of a whole number, decimal, or fraction.
Time
Average Time Calculator
Average elapsed durations and see their total, minimum, and maximum.
Algebra
Interval Notation Calculator
Convert simple inequalities and interval unions into clear notation.
Algebra
Rational Function Calculator
Find domain exclusions, holes, intercepts, and asymptotes for quadratic ratios.
Algebra
Zeros of a Function Calculator
Find real polynomial roots through degree 6, plus quadratic complex roots.
Algebra
Parabola Calculator
Find a quadratic vertex, roots, axis, focus, and directrix.
Algebra
Three-Variable System Calculator
Solve three linear equations and identify inconsistent or dependent systems.
Physics
Projectile Motion Calculator
Estimate flight time, range, peak height, and the ideal trajectory.
Physics
Kinematics Calculator
Solve constant-acceleration displacement, velocity, acceleration, and time.
Algebra
Composite Function Calculator
Expand f(g(x)) or g(f(x)) for polynomial inputs and evaluate a point.
Algebra
Ordered Pairs Function Calculator
Test whether a relation is a function and list its domain and range.
Statistics
Cohen's d Calculator
Calculate a signed independent-group effect size using pooled standard deviation.
Everyday Math
Inverse Trigonometry Calculator
Find principal arcsin, arccos, and arctan angles in degrees or radians.
Everyday Math
Number Line Solver
Sort numbers and fractions, or plot a simple interval or inequality.
Everyday Math
Four-Function Calculator
Evaluate everyday arithmetic with parentheses and exact fraction results.
Calculus
Area Under a Graph Calculator
Find signed integrals and total geometric area for polynomial curves.
Everyday Math
Trigonometric Graphing Calculator
Graph transformed sine, cosine, or tangent with explicit angle units.
Everyday Math
Log Graphing Calculator
Graph a shifted logarithm and inspect its domain and intercept.
Savings & Planning
How Long Will My Money Last?
Explore savings coverage using your spending, income, inflation, and return assumptions.
Retirement
403(b) Calculator
Model a hypothetical 403(b) balance from the contributions and returns you choose.
Retirement
457(b) Calculator
Model a hypothetical 457(b) balance from the contributions and returns you choose.
Retirement
TSP Growth Calculator
Model a hypothetical TSP balance from the contributions and returns you choose.
Investing
VOO Investment Calculator
Explore a hypothetical investment scenario without live prices or return claims.
Savings & Planning
Monthly Savings Calculator
Project a future balance or solve for the monthly deposit needed for a target.
Investing
Monthly Dividend Calculator
Estimate annual dividend income and its average monthly equivalent.
Investing
Dividend Reinvestment Calculator
Compare reinvested dividends with keeping distributions as cash.
Paycheck Worksheets
Oklahoma Paycheck Calculator
A manual-withholding worksheet for your Oklahoma paycheck; tax amounts must be entered.
Paycheck Worksheets
Missouri Paycheck Calculator
A manual-withholding worksheet for your Missouri paycheck; tax amounts must be entered.
Paycheck Worksheets
Maryland Paycheck Calculator
A manual-withholding worksheet for your Maryland paycheck; tax amounts must be entered.
Paycheck Worksheets
Ohio Paycheck Calculator
A manual-withholding worksheet for your Ohio paycheck; tax amounts must be entered.
Paycheck Worksheets
Virginia Paycheck Calculator
A manual-withholding worksheet for your Virginia paycheck; tax amounts must be entered.
Paycheck Worksheets
Georgia Paycheck Calculator
A manual-withholding worksheet for your Georgia paycheck; tax amounts must be entered.
Paycheck Worksheets
Kentucky Paycheck Calculator
A manual-withholding worksheet for your Kentucky paycheck; tax amounts must be entered.
Paycheck Worksheets
Louisiana Paycheck Calculator
A manual-withholding worksheet for your Louisiana paycheck; tax amounts must be entered.
Paycheck Worksheets
Connecticut Paycheck Calculator
A manual-withholding worksheet for your Connecticut paycheck; tax amounts must be entered.
Paycheck Worksheets
Massachusetts Paycheck Calculator
A manual-withholding worksheet for your Massachusetts paycheck; tax amounts must be entered.
Unit Converters
Length Converter
Convert length units with a clear result and a complete equivalence table.
Unit Converters
Weight & Mass Converter
Convert mass units with a clear result and a complete equivalence table.
Unit Converters
Temperature Converter
Convert temperature units with a clear result and a complete equivalence table.
Unit Converters
Area Converter
Convert area units with a clear result and a complete equivalence table.
Everyday Math
Percentage Calculator
Find what percentage one number is of another.
Everyday Math
Percent of a Number Calculator
Calculate a percentage of any number.
Everyday Math
Percentage Change Calculator
Measure the percent increase or decrease from an old value to a new value.
Everyday Math
Percentage Difference Calculator
Compare two values using their average magnitude as the reference.
Everyday Math
Proportion Calculator
Solve a proportion of the form a/b = c/x.
Everyday Math
Average Calculator
Find the arithmetic mean of a list of numbers.
Everyday Math
Weighted Average Calculator
Calculate a weighted mean from three values and their weights.
Everyday Math
Fraction to Decimal Calculator
Convert a numerator and denominator into a decimal.
Everyday Math
Decimal to Percent Calculator
Convert a decimal value into a percentage.
Everyday Math
Percent to Decimal Calculator
Convert a percentage into decimal form.
Everyday Math
Exponent Calculator
Raise a base number to a chosen exponent.
Everyday Math
Nth Root Calculator
Find the real nth root of a number.
Everyday Math
Logarithm Calculator
Calculate a logarithm using any valid positive base.
Everyday Math
Absolute Value Calculator
Find the nonnegative distance of a number from zero.
Everyday Math
Rounding Calculator
Round a number to a selected number of decimal places.
Everyday Math
Remainder Calculator
Find the quotient and remainder for integer division.
Everyday Math
GCF / GCD Calculator
Find the greatest common divisor of two whole numbers.
Everyday Math
LCM Calculator
Find the least common multiple of two whole numbers.
Everyday Math
Prime Factorization Calculator
Break a positive integer into its prime factors.
Everyday Math
Factorial Calculator
Calculate n! for a nonnegative whole number.
Everyday Math
Permutation Calculator
Count ordered selections of r items from n.
Everyday Math
Combination Calculator
Count unordered selections of r items from n.
Algebra
Quadratic Formula Calculator
Solve ax² + bx + c = 0 and inspect its discriminant.
Algebra
Discriminant Calculator
Calculate b² − 4ac and classify the real roots of a quadratic.
Algebra
Slope Calculator
Find the slope between two coordinate points.
Algebra
Midpoint Calculator
Find the point exactly halfway between two coordinates.
Algebra
Distance Between Two Points Calculator
Find straight-line distance between two coordinate points.
Algebra
Slope-Intercept Calculator
Find y = mx + b from two distinct points.
Algebra
Point-Slope Form Calculator
Build a point-slope equation from a point and slope.
Algebra
Linear Interpolation Calculator
Estimate y at an x-value between or beyond two known points.
Algebra
Arithmetic Sequence Calculator
Find the nth term of an arithmetic sequence.
Algebra
Arithmetic Series Sum Calculator
Find the sum of the first n terms of an arithmetic sequence.
Algebra
Geometric Sequence Calculator
Find the nth term of a geometric sequence.
Algebra
Geometric Series Sum Calculator
Find the sum of the first n terms of a geometric sequence.
Algebra
Two-Equation System Calculator
Solve two linear equations in x and y.
Algebra
Direct Variation Calculator
Find the constant k in y = kx and project another value.
Geometry
Rectangle Calculator
Calculate rectangle area, perimeter, and diagonal.
Geometry
Square Calculator
Calculate square area, perimeter, and diagonal from a side length.
Geometry
Triangle Area Calculator
Find triangle area from a base and perpendicular height.
Geometry
Triangle Perimeter Calculator
Calculate a triangle perimeter from three side lengths.
Geometry
Circle Calculator
Calculate circle area, circumference, and diameter from radius.
Geometry
Trapezoid Area Calculator
Find trapezoid area from two parallel bases and height.
Geometry
Parallelogram Area Calculator
Calculate parallelogram area from base and perpendicular height.
Geometry
Rhombus Area Calculator
Calculate rhombus area from its two diagonals.
Geometry
Ellipse Area Calculator
Find ellipse area from the semi-major and semi-minor axes.
Geometry
Sector Area Calculator
Calculate the area of a circular sector from radius and central angle.
Geometry
Arc Length Calculator
Calculate circular arc length from radius and central angle.
Geometry
Regular Polygon Interior Angle Calculator
Find each interior angle and the total interior-angle sum of a regular polygon.
Geometry
Regular Polygon Area Calculator
Calculate regular polygon area from side count and side length.
Geometry
Pythagorean Theorem Calculator
Find the hypotenuse from two perpendicular legs.
Geometry
Right Triangle Calculator
Calculate a right triangle’s hypotenuse, area, and acute angles from two legs.
Geometry
Cube Calculator
Calculate cube volume, surface area, and space diagonal.
Geometry
Rectangular Prism Calculator
Calculate box volume, surface area, and space diagonal.
Geometry
Cylinder Calculator
Calculate cylinder volume and total surface area.
Statistics
Mean, Median & Mode Calculator
Find common measures of center for a list of numbers.
Statistics
Variance Calculator
Calculate population or sample variance for a data set.
Statistics
Standard Deviation Calculator
Calculate sample or population standard deviation.
Statistics
Z-Score Calculator
Standardize a value using a mean and standard deviation.
Statistics
Coefficient of Variation Calculator
Compare standard deviation with the magnitude of the mean.
Statistics
Probability of A or B Calculator
Calculate P(A ∪ B) when P(A), P(B), and their overlap are known.
Statistics
Independent Probability Calculator
Calculate the probability that two independent events both occur.
Statistics
Correlation Coefficient Calculator
Calculate Pearson’s r from paired x and y values.
Savings & Planning
Simple Interest Calculator
Estimate interest and ending balance without compounding.
Savings & Planning
Compound Interest Calculator
Project growth with a fixed rate and compounding frequency.
Savings & Planning
Loan Payment Calculator
Estimate a fixed monthly payment for a standard amortizing loan.
Savings & Planning
Mortgage Payment Calculator
Estimate monthly principal-and-interest payment for a fixed-rate mortgage.
Savings & Planning
Discount Calculator
Calculate a sale price and amount saved from a percentage discount.
Savings & Planning
Markup Calculator
Calculate selling price from cost and markup percentage.
Savings & Planning
Profit Margin Calculator
Calculate gross margin percentage from cost and selling price.
Savings & Planning
Sales Tax Calculator
Add a user-entered sales-tax rate to a pre-tax amount.
Savings & Planning
Tip Calculator
Calculate tip amount and total bill from a chosen percentage.
Savings & Planning
Split Bill Calculator
Split a bill plus tip evenly among a number of people.
Savings & Planning
ROI Calculator
Calculate simple return on investment from initial and final values.
Savings & Planning
CAGR Calculator
Calculate compound annual growth rate between a start and end value.
Time
Age Calculator
Calculate age between a birth date and another date.
Time
Date Difference Calculator
Find elapsed days and calendar components between two dates.
Time
Add Days to Date Calculator
Add or subtract a whole number of days from a calendar date.
Time
Hours and Minutes to Decimal Hours
Convert hours and minutes into decimal hours.
Time
Decimal Hours to Hours & Minutes
Convert a decimal-hour duration into hours and minutes.
Physics
Speed Calculator
Calculate average speed from distance and elapsed time.
Unit Converters
Volume Converter
Convert liquid and solid volume units.
Unit Converters
Speed Converter
Convert speed and velocity units.
Unit Converters
Time Unit Converter
Convert common duration units.
Unit Converters
Pressure Converter
Convert pressure units.
Unit Converters
Energy Converter
Convert energy and work units.
Unit Converters
Power Converter
Convert power units.
Unit Converters
Data Storage Converter
Convert decimal and binary digital storage units.
Unit Converters
Data Transfer Rate Converter
Convert common network and data-transfer rates.
Unit Converters
Angle Converter
Convert degrees, radians, gradians, and turns.
Unit Converters
Frequency Converter
Convert frequency units.
Unit Converters
Force Converter
Convert force units.
Unit Converters
Acceleration Converter
Convert acceleration units.
Unit Converters
Density Converter
Convert density units.
Unit Converters
Torque Converter
Convert torque units.
Unit Converters
Fuel Economy Converter
Convert fuel economy between mpg, km/L, and L/100 km.
Unit Converters
Cooking Volume Converter
Convert common kitchen volume measurements.
Unit Converters
Flow Rate Converter
Convert volumetric flow-rate units.
Unit Converters
Dynamic Viscosity Converter
Convert dynamic viscosity units.
Unit Converters
Kinematic Viscosity Converter
Convert kinematic viscosity units.
Unit Converters
Magnetic Field Converter
Convert magnetic flux density units.
Unit Converters
Electric Charge Converter
Convert electric charge units.
Unit Converters
Voltage Converter
Convert electric potential units by SI prefix.
Unit Converters
Electrical Resistance Converter
Convert electrical resistance units by SI prefix.
Unit Converters
Capacitance Converter
Convert capacitance units by SI prefix.
Unit Converters
Inductance Converter
Convert inductance units by SI prefix.
Unit Converters
Radioactivity Converter
Convert activity units for radioactive decay.
Unit Converters
Absorbed Radiation Dose Converter
Convert absorbed radiation dose units.
Unit Converters
Equivalent Radiation Dose Converter
Convert equivalent-dose units.
Unit Converters
Luminance Converter
Convert luminance units.
Unit Converters
Illuminance Converter
Convert illuminance units.
Unit Converters
Typography Length Converter
Convert common print and typography length units.
Unit Converters
Mass Concentration Converter
Convert mass-per-volume concentration units.
Everyday Math
Ratio Simplifier
Reduce a two-number ratio to its simplest whole-number form.
Everyday Math
Fraction Addition Calculator
Add two fractions and return a simplified exact fraction.
Everyday Math
Fraction Subtraction Calculator
Subtract one fraction from another and simplify the result.
Everyday Math
Fraction Multiplication Calculator
Multiply two fractions and simplify the exact result.
Everyday Math
Fraction Division Calculator
Divide one fraction by another and simplify the exact result.
Everyday Math
Decimal to Fraction Calculator
Convert a decimal to a simplified fraction.
Everyday Math
Fraction to Percent Calculator
Convert a fraction into a percentage.
Everyday Math
Scientific Notation Calculator
Express a number in scientific notation.
Everyday Math
Significant Figures Calculator
Round a number to a chosen number of significant figures.
Everyday Math
Prime Number Checker
Check whether a positive whole number is prime.
Everyday Math
Sum of Integers Calculator
Find 1 + 2 + … + n without listing every term.
Everyday Math
Sum of Squares Calculator
Calculate 1² + 2² + … + n².
Everyday Math
Sum of Cubes Calculator
Calculate 1³ + 2³ + … + n³.
Everyday Math
Geometric Mean Calculator
Find the geometric mean of positive values.
Everyday Math
Harmonic Mean Calculator
Find the harmonic mean of positive values.
Everyday Math
Root Mean Square Calculator
Calculate the RMS value of a list of numbers.
Everyday Math
Percentage Error Calculator
Compare a measured value with an accepted value as a percentage error.
Everyday Math
Unit Rate Calculator
Convert a quantity pair into an amount per one unit.
Everyday Math
Ratio to Percentage Calculator
Express a ratio a:b as a percentage of b.
Everyday Math
Mixed Number to Improper Fraction Calculator
Convert a mixed number into a simplified improper fraction.
Algebra
Linear Equation Calculator
Solve an equation of the form ax + b = c.
Algebra
Quadratic Vertex Calculator
Find the vertex of y = ax² + bx + c.
Algebra
Standard Form Line Slope Calculator
Find the slope of a line written Ax + By = C.
Algebra
Point to Line Distance Calculator
Find the shortest distance from a point to Ax + By + C = 0.
Algebra
Circle Equation Calculator
Get radius and area from (x − h)² + (y − k)² = r².
Algebra
Exponential Growth Calculator
Project a starting value using a constant percentage growth rate.
Algebra
Exponential Decay Calculator
Project a starting value using a constant percentage decay rate.
Algebra
Half-Life Calculator
Find the remaining quantity after a number of half-lives.
Algebra
Doubling Time Calculator
Estimate doubling time from a constant compound growth rate.
Algebra
Polynomial Evaluation Calculator
Evaluate ax³ + bx² + cx + d at a chosen x value.
Geometry
Sphere Volume Calculator
Calculate the volume of a sphere from its radius.
Geometry
Sphere Surface Area Calculator
Calculate the surface area of a sphere.
Geometry
Cone Volume Calculator
Calculate the volume of a right circular cone.
Geometry
Cone Surface Area Calculator
Find total surface area of a right circular cone.
Geometry
Cone Slant Height Calculator
Find a cone’s slant height from radius and vertical height.
Geometry
Hemisphere Volume Calculator
Calculate the volume of a hemisphere.
Geometry
Square Pyramid Volume Calculator
Calculate volume from base side length and vertical height.
Geometry
Triangular Prism Volume Calculator
Calculate prism volume from triangle base, triangle height, and prism length.
Geometry
Cylinder Surface Area Calculator
Find total surface area of a closed cylinder.
Geometry
Annulus Area Calculator
Find the area between two concentric circles.
Geometry
Circle Chord Length Calculator
Find chord length from circle radius and central angle.
Geometry
Circle Segment Area Calculator
Estimate minor-segment area from radius and central angle.
Geometry
Sector Perimeter Calculator
Calculate arc length plus two radii for a circular sector.
Geometry
Ellipse Circumference Calculator
Approximate ellipse circumference with Ramanujan’s formula.
Geometry
Rectangle Diagonal Calculator
Find the diagonal of a rectangle from width and height.
Statistics
Median Calculator
Find the middle value of a numeric data set.
Statistics
Mode Calculator
Find the most frequently occurring value or values.
Statistics
Range Calculator
Find the minimum, maximum, and range of a data set.
Statistics
Quartile and IQR Calculator
Find Q1, median, Q3, and the interquartile range.
Statistics
Percentile Calculator
Estimate a percentile value from a data set using linear interpolation.
Statistics
Percentile Rank Calculator
Estimate the percentage of observations at or below a chosen value.
Statistics
Standard Error Calculator
Estimate the standard error of the sample mean from raw observations.
Statistics
Mean Confidence Interval Calculator
Build a z-based confidence interval for a mean from mean, known standard deviation, and sample size.
Statistics
Expected Value Calculator
Calculate the weighted expected value of discrete outcomes.
Statistics
Linear Regression Calculator
Fit a least-squares line y = mx + b to paired data.
Savings & Planning
Break-Even Units Calculator
Estimate the number of units needed to cover fixed costs.
Savings & Planning
Contribution Margin Calculator
Calculate contribution margin per unit and as a percentage of sales.
Savings & Planning
Commission Calculator
Calculate commission earnings from sales and commission rate.
Savings & Planning
Salary to Hourly Calculator
Convert annual salary to an approximate hourly rate.
Savings & Planning
Overtime Pay Calculator
Estimate gross weekly pay with regular and overtime hours.
Savings & Planning
Future Value Calculator
Project a lump sum using a fixed compound return.
Savings & Planning
Present Value Calculator
Discount a future amount back to today using a fixed rate.
Savings & Planning
Affiliate Commission Calculator
Estimate affiliate earnings from clicks, conversion rate, order value, and commission rate.
Savings & Planning
ROAS Calculator
Calculate return on ad spend from revenue and advertising cost.
Savings & Planning
Page RPM Calculator
Estimate revenue per thousand pageviews.
Physics
Kinetic Energy Calculator
Calculate kinetic energy from mass and speed.
Physics
Gravitational Potential Energy Calculator
Calculate near-Earth gravitational potential energy.
Physics
Momentum Calculator
Calculate linear momentum from mass and velocity.
Physics
Force Calculator
Calculate net force from mass and acceleration.
Physics
Work Calculator
Calculate mechanical work for force applied along the displacement direction.
Physics
Mechanical Power Calculator
Calculate average power from work and elapsed time.
Physics
Ohm’s Law Voltage Calculator
Calculate voltage from current and resistance.
Physics
Electric Power Calculator
Calculate electrical power from voltage and current.
Physics
Wavelength Calculator
Calculate wavelength from wave speed and frequency.
Physics
Density Calculator
Calculate mass density from mass and volume.
Unit Converters
Electric Current Converter
Convert amperes and common SI-prefixed current units.
Unit Converters
Electrical Conductance Converter
Convert siemens and common SI-prefixed conductance units.
Unit Converters
Electrical Resistivity Converter
Convert electrical resistivity units.
Unit Converters
Electrical Conductivity Converter
Convert siemens-per-meter conductivity units.
Unit Converters
Electric Field Strength Converter
Convert electric field strength units.
Unit Converters
Magnetic Flux Converter
Convert webers, milliwebers, microwebers, and maxwells.
Unit Converters
Luminous Flux Converter
Convert lumens and related luminous-flux scales.
Unit Converters
Angular Velocity Converter
Convert radians per second, degrees per second, RPM, and revolutions per second.
Unit Converters
Angular Acceleration Converter
Convert angular acceleration units.
Unit Converters
Jerk Converter
Convert common jerk units.
Unit Converters
Mass Flow Rate Converter
Convert kilograms per second and common mass-flow units.
Unit Converters
Surface Tension Converter
Convert newtons per meter and related surface-tension units.
Unit Converters
Thermal Conductivity Converter
Convert common thermal-conductivity units.
Unit Converters
Heat Flux Converter
Convert heat-flow density units.
Unit Converters
Specific Heat Capacity Converter
Convert specific heat capacity units.
Unit Converters
Heat Transfer Coefficient Converter
Convert heat-transfer coefficient units.
Unit Converters
Energy Density Converter
Convert joules per cubic meter and related units.
Unit Converters
Specific Volume Converter
Convert volume-per-mass units.
Unit Converters
Moment of Inertia Converter
Convert mass moment of inertia units.
Unit Converters
Spring Constant Converter
Convert spring-rate / stiffness units.
Unit Converters
Molar Concentration Converter
Convert molarity-scale concentration units.
Unit Converters
Amount of Substance Converter
Convert moles and common SI-prefixed amount units.
Unit Converters
Molar Flow Rate Converter
Convert amount-of-substance flow rates.
Unit Converters
Entropy Converter
Convert entropy units.
Unit Converters
Pressure Gradient Converter
Convert pressure change per unit length.
Unit Converters
Linear Charge Density Converter
Convert electric charge per unit length.
Unit Converters
Surface Charge Density Converter
Convert electric charge per unit area.
Unit Converters
Volume Charge Density Converter
Convert electric charge per unit volume.
Unit Converters
Temperature Difference Converter
Convert temperature intervals without absolute-temperature offsets.
Unit Converters
Running Pace Converter
Convert running pace between minutes per kilometer and minutes per mile.
Everyday Math
10th Power Calculator
Raise a real number to the power of 10.
Savings & Planning
Affiliate Campaign Commission Calculator
Calculate commission for affiliate campaign from conversions and commission per conversion.
Physics
Kinetic Energy from Mass and Speed Calculator
Calculate kinetic energy from mass and speed.
Health & Fitness
Body Mass Index Calculator
Calculate BMI from body mass and height.
Unit Converters
Centimeter to Foot Converter
Convert centimeter values to foot using the standard length conversion factor.
No tools matched this search.
Try a shorter phrase or clear the category and bookmark filters.