All Calculators
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Percentage Calculator
Free percentage calculator: find what X% of a number is, what percent one number is of another, or increase a number by a percent.
MathPercentage Increase Calculator
Calculate percentage increase between two values instantly.
MathPercentage Decrease Calculator
Calculate percentage decrease between two values instantly.
MathPercentage Difference Calculator
Find the percentage difference between two values using their average as the reference.
MathPercentage Change Calculator
Calculate percentage change from an old value to a new value.
MathPercentage Off Calculator
Find the sale price after a percentage discount and how much you save.
MathTank Volume Calculator
Calculate the capacity of a cylindrical, rectangular or spherical tank in gallons, liters and cubic feet from its dimensions in inches.
MathStandard Deviation Calculator
Calculate standard deviation (population and sample), variance and mean for any data set.
MathMean Calculator
Find the mean (average) of any list of numbers, plus the sum, count, minimum, maximum and range.
MathMean Median Mode Calculator
Calculate mean, median, mode and range for any data set in one step.
MathPercentile Calculator
Find the value at a given percentile (like the 75th or 90th) in your data set using the standard linear-interpolation method used by Excel and NumPy.
MathCovariance Calculator
Calculate sample and population covariance between two data sets, plus the Pearson correlation coefficient.
MathFactor Calculator
Find every factor of a number, its prime factorization, and whether it is prime.
MathFactoring Calculator
Factor a quadratic expression ax² + bx + c into two binomials and see its roots and discriminant.
MathSimplify Calculator
Simplify any fraction to lowest terms instantly.
MathRadical Calculator
Simplify square roots to simplest radical form (like 6√2) with the decimal approximation, or evaluate any nth root.
MathRounding Calculator
Round any number to the nearest integer, tenth, hundredth, thousand, or a custom number of decimal places.
MathQuadratic Formula Calculator
Solve any quadratic equation with the quadratic formula.
MathRREF Calculator
Compute the reduced row echelon form (RREF) of a matrix with Gauss–Jordan elimination, plus its rank.
MathLinear Regression Calculator
Fit a least-squares regression line to paired data.
MathP-Value Calculator
Convert a z-score or t-statistic into a p-value for left, right or two-tailed tests.
MathCircle Calculator
Enter any one value — radius, diameter, circumference or area — and get all four circle measurements instantly, using full-precision π.
MathCircumference Calculator
Find a circle’s circumference from its radius, diameter or area, and get the remaining measurements too.
MathSurface Area Calculator
Calculate the surface area of a cube, rectangular prism, cylinder, sphere or cone from its dimensions.
MathArc Length Calculator
Find arc length, sector area and chord length from a circle’s radius and central angle in degrees.
MathTriangle Area Calculator
Calculate a triangle’s area three ways: base × height, Heron’s formula from three sides, or two sides with the included angle.
MathRight Triangle Calculator
Solve a right triangle from two legs, or from one leg and the hypotenuse.
MathSpecial Right Triangle Calculator
Solve 45°-45°-90° and 30°-60°-90° triangles from any single side using their fixed side ratios.
MathVolume of a Cone Calculator
Calculate a cone’s volume from radius and height, plus slant height, lateral area and total surface area.
MathSolve for X Calculator
Solve a one-step or two-step linear equation ax + b = c for x.
MathInequality Calculator
Solve a linear inequality for x, with the sign-flip rule for negative coefficients handled automatically.
MathFraction Calculator
Add, subtract, multiply or divide two fractions and get the result in lowest terms, plus its decimal and mixed-number forms.
MathLong Division Calculator
Divide any two numbers and get the quotient, the remainder and the full decimal result.
MathAverage Percentage Calculator
Average a list of percentages instantly, with the median, sum and count.
FinanceMortgage Calculator
Estimate your monthly mortgage payment including principal, interest, property taxes, homeowners insurance and HOA dues.
FinanceMortgage Recast Calculator
See how a lump-sum payment plus a mortgage recast lowers your monthly payment while keeping the same rate and payoff date.
FinanceDividend Calculator
Calculate dividend income from shares owned: annual, quarterly and monthly income, dividend yield and total invested.
FinanceCompound Interest Calculator
Project compound growth with your choice of compounding frequency, plus optional monthly contributions or withdrawals.
FinanceLoan Calculator
Calculate the monthly payment and total interest for any loan, and see how an extra monthly payment shortens the loan and saves interest.
FinanceAuto Loan Calculator
Calculate a car loan payment including sales tax, down payment and trade-in value.
FinanceConstruction Loan Calculator
Estimate interest-only payments during a construction loan’s draw period, assuming even monthly draws.
FinanceCredit Card Payoff Calculator
Find out how long it takes to pay off a credit card with a fixed monthly payment, or by paying only the minimum.
FinanceCap Rate Calculator
Calculate a rental property’s capitalization rate and net operating income from rent, vacancy and operating expenses.
FinanceProrated Rent Calculator
Calculate prorated rent for moving in mid-month: daily rate, days charged and the exact partial payment based on the real days in that month.
FinanceRent Split Calculator
Split rent between roommates equally, or proportionally by income or room size for a fair share.
FinanceDebt-to-Income Ratio Calculator
Calculate your debt-to-income ratio (DTI) and housing ratio from monthly debts and gross income.
FinanceBond Calculator
Price a bond from its yield to maturity, or solve for the yield from a price.
FinanceSavings Bond Calculator
Project the value of Series EE or Series I US savings bonds, including the EE 20-year doubling guarantee.
FinanceAPY Calculator
Convert an APR and compounding frequency into the true APY, or project how a savings balance grows at a given APY.
FinancePresent Value Calculator
Discount a future amount back to today’s value at any rate and compounding frequency.
FinancePresent Value of Annuity Calculator
Value a stream of equal payments today: pensions, leases, structured settlements.
Finance401(k) Match Calculator
Calculate your yearly 401(k) contribution, your employer’s match, and whether you are leaving match money on the table.
FinanceStock Return Calculator
Calculate the total profit and percentage return on a stock position including dividends received and trading fees.
FinanceGold Value Calculator
Calculate the melt value of gold jewelry, coins or bullion from weight, karat purity and the spot price you enter.
FinanceSilver Melt Value Calculator
Calculate the melt value of silver coins, sterling flatware and bullion by weight and purity (999, 925 sterling, 900 coin, 800) at the spot price you enter.
FinanceCoast FIRE Calculator
Find your Coast FIRE number: how much you need invested today so compound growth alone reaches your retirement target.
FinancePay Rate Calculator
Convert an hourly rate to weekly, monthly and annual pay — or a salary back to its hourly equivalent.
FinanceXRP Calculator
Convert XRP to US dollars or dollars to XRP using the current price you enter.
FinanceDogecoin Calculator
Convert Dogecoin to US dollars or dollars to Dogecoin using the current price you enter.
FinanceExponential Growth Calculator
Project exponential growth (or decay) for money, populations or anything growing by a fixed percent per period.
EducationGPA Calculator
Calculate your GPA from letter grades and credits, for one semester or cumulatively with a previous GPA.
EducationWeighted Grade Calculator
Compute a weighted grade average from scores and their syllabus weights — homework, quizzes, tests, finals.
EducationSemester Grade Calculator
Calculate your GPA for a single semester from this term’s course grades and credit hours.
EducationFinal Grade Calculator
Find the exact score you need on your final exam to hit a target course grade, given your current grade and the final’s weight.
EducationGrade Curve Calculator
See what a grade curve does to a score: square-root curve, adding flat points, or scaling to the highest score in class.
EducationTest Grade Calculator
Turn “42 out of 50” into a percentage and letter grade instantly.
EducationSAT Score Calculator
Estimate your digital SAT score from questions answered correctly: Reading & Writing (54 questions) and Math (44).
EducationACT Score Calculator
Calculate your ACT composite from English, Math, Reading and Science scale scores.
EducationLSAT Score Calculator
Estimate your LSAT scaled score (120–180) from the number of questions you answered correctly.
EducationMCAT Score Calculator
Add up your MCAT total from the four section scores (118–132 each): Chem/Phys, CARS, Bio/Biochem and Psych/Soc.
EducationAP Calculus BC Score Calculator
Estimate your AP Calculus BC score from multiple-choice correct answers (of 45) and free-response points (of 54).
EducationAP Calculus AB Score Calculator
Estimate your AP Calculus AB score from multiple-choice correct answers (of 45) and free-response points (of 54).
EducationAPES Score Calculator
Estimate your AP Environmental Science (APES) score from 80 multiple-choice questions and 30 free-response points, using recent released scoring patterns.
EducationSHSAT Score Calculator
Estimate your SHSAT score from correct answers in ELA and Math (57 scored questions each).
Date & TimeAge Calculator
Calculate exact age from a date of birth: years, months and days, total days lived, the day of the week you were born, and when your next birthday falls.
Date & TimeDays Between Dates Calculator
Count the days between two dates: total days, a years-months-days breakdown, business days and weekend days.
Date & TimeDate Calculator
Add or subtract any number of days, weeks, months or years from a date.
Date & TimeElapsed Time Calculator
Find the time elapsed between a start and end time: hours and minutes, total minutes and decimal hours.
Date & TimeTime and a Half Calculator
Calculate time-and-a-half overtime pay: your 1.
Date & TimeHalf Birthday Calculator
Find your half birthday: exactly six months after your birthday.
Date & TimeCat Age Calculator
Convert your cat’s age to human years with the veterinary model (15 years for year one, +9 for year two, +4 after).
Date & TimeTravel Time Calculator
Work out travel time from distance and speed — or solve for distance or average speed instead.
Date & TimeLead Time Calculator
Add a supplier lead time to an order date — in calendar days or business days — to get the expected delivery or completion date.
Date & TimeCourt Date Calculator
Estimate a filing deadline by adding calendar days, or court days that skip weekends and US federal holidays, to a trigger date.
Date & TimeSpeech Time Calculator
Estimate speaking time from your script text or word count at slow, average or fast speaking rates.
Date & TimeHours Calculator
Calculate work hours from clock-in and clock-out times, minus unpaid breaks.
Date & TimeDoubling Time Calculator
Find how long growth at a fixed rate takes to double: the exact answer plus the Rule of 70 and Rule of 72 estimates used in finance and biology.
ConversionLength Converter
Convert length and distance between millimeters, centimeters, meters, kilometers, inches, feet, yards and miles with exact standard factors.
ConversionWeight Converter
Convert weight and mass between kilograms, grams, pounds, ounces, stone and US tons.
ConversionAngle Converter
Convert angles between degrees, radians, gradians and full turns.
ConversionGrams to Cups Converter
Convert grams to cups (and cups to grams) correctly — by ingredient, because a cup of flour does not weigh the same as a cup of sugar.
ConversionGrams to Teaspoons Converter
Convert grams to teaspoons and teaspoons to grams by ingredient, using level-teaspoon reference weights.
ConversionMilliliters to Ounces Converter
Convert milliliters to US fluid ounces and between liters, cups, tablespoons, teaspoons and gallons.
ConversionMilliliters to Grams Converter
Convert milliliters to grams and grams to milliliters using the density of the substance — water, milk, olive oil, honey, flour, sugar and ethanol.
ConversionAmps to kW Converter
Convert amps to kilowatts for DC, single-phase and three-phase AC with power factor — and back: kW to amps, VA to amps, amps to VA, kVA to kW.
ConversionTorque Converter
Convert torque between newton-meters (Nm), foot-pounds (ft-lb), inch-pounds (in-lb) and kilogram-centimeters (kgf·cm) with exact factors.
ConversionGallons to Pounds Converter
Convert US gallons to pounds (and pounds to gallons) by liquid: water 8.
ConversionSquare Feet to Cubic Yards Converter
Convert an area in square feet and a depth in inches into cubic yards and cubic feet — the amount of concrete, soil, mulch or gravel you actually need to order.
ConversionLiquid Conversion Converter
Convert between all US liquid measures and metric: teaspoons, tablespoons, fluid ounces, cups, pints, quarts, gallons, milliliters and liters.
ConversionArea Converter
Convert area between square feet, square meters, square yards, square inches, acres, hectares, square kilometers and square miles with exact factors.