Calculators & Math Tools
Solve everyday arithmetic and financial scenarios with visible formulas and stated assumptions.
Percentage Calculator
Calculate a chosen percentage of a value.
Calculators & MathPercentage Change Calculator
Measure relative change from an original value.
Calculators & MathAverage Calculator
Calculate the arithmetic mean of a list.
Calculators & MathMedian Calculator
Find the middle value of an ordered list.
Calculators & MathStandard Deviation Calculator
Calculate population or sample standard deviation.
Calculators & MathRatio Calculator
Reduce a pair of positive integers to simplest terms.
Calculators & MathFraction Calculator
Add, subtract, multiply or divide two rational numbers.
Calculators & MathScientific Calculator
Evaluate arithmetic, powers and common mathematical functions.
Calculators & MathSquare Root Calculator
Find a real square root of a nonnegative number.
Calculators & MathExponent Calculator
Raise a number to a chosen power.
Calculators & MathPrime Number Checker
Test integer primality using bounded trial division.
Calculators & MathGCD Calculator
Find the greatest common divisor of integers.
Calculators & MathLCM Calculator
Find the least common multiple of integers.
Calculators & MathFactorial Calculator
Calculate exact factorials using arbitrary-sized integers.
Calculators & MathRandom Number Generator
Generate an unbiased integer in an inclusive range.
Calculators & MathCompound Interest Calculator
Model periodic compounding with fixed principal and rate.
Calculators & MathSimple Interest Calculator
Calculate interest without compounding.
Calculators & MathLoan EMI Calculator
Estimate fixed monthly payments on an amortizing loan.
Calculators & MathDiscount Calculator
Calculate savings and price after a percentage discount.
Calculators & MathSales Tax Calculator
Calculate tax and total from a pretax price.
Calculators & MathAspect Ratio Calculator
Reduce positive integer width and height to their simplest ratio.
Calculators & MathDPI and PPI Calculator
Calculate diagonal pixels per inch from physical diagonal size. Display scaling is not included.
Calculators & MathGolden Ratio Calculator
Calculate the longer and shorter golden-section parts of a total length.
Calculators & MathFraction to Decimal Converter
Divide an integer numerator by a nonzero denominator. Floating point precision applies.
Calculators & MathDecimal to Fraction Converter
Convert a finite decimal string to an exact reduced fraction, up to 15 decimal places.
Calculators & MathPrime Factorization Calculator
Factor an integer from 2 to 10^12 by bounded trial division.
Calculators & MathMatrix Calculator
Add, multiply or transpose rectangular JSON numeric matrices up to 20 by 20.
Calculators & MathScientific Notation Converter
Convert a finite real number to scientific notation with chosen significant digits.
Calculators & MathData Transfer Time Calculator
Estimate seconds from bytes and bits per second. Uses decimal rates and excludes protocol overhead.
Calculators & MathInflation Calculator
Estimate inflation-adjusted cost using an entered annual rate. No live price index is queried.
Calculators & MathTip Calculator
Calculate a tip and split a bill evenly among a positive number of people.
Calculators & MathROI Calculator
Calculate return on investment from initial cost and final proceeds, excluding tax and time value.
Calculators & MathBreak Even Calculator
Calculate units required to cover fixed costs when unit price exceeds variable unit cost.
Calculators & MathHourly Rate to Salary Converter
Estimate gross salary from hourly rate, hours per week and paid weeks per year.
Calculators & MathCPM Calculator
Calculate cost per thousand impressions from an entered campaign cost and impression count.
Calculators & MathCTR Calculator
Calculate click-through rate from clicks and impressions. Counts must be nonnegative integers.
Calculators & MathProfit Margin Calculator
Calculate gross profit, margin and markup from selling price and cost.
Calculators & MathPayment Processing Fee Calculator
Estimate net proceeds using your own percentage and fixed fee. No current processor pricing is assumed.
Calculators & MathAdSense Revenue Estimator
Estimate revenue from page views and your entered page RPM. This is a scenario, not an earnings prediction.
Calculators & MathVector Distance Calculator
Calculate Euclidean distance and cosine similarity for equal-length finite numeric JSON vectors.
Calculators & MathOhms Law Calculator
Calculate current and power from positive resistance and voltage. Units are volts, ohms, amperes and watts.
Calculators & MathCapacitor Code Calculator
Decode a three-digit capacitor code in picofarads; the last digit is the decimal multiplier.
Calculators & MathLED Series Resistor Calculator
Estimate series resistance and resistor dissipation from supply, forward voltage and current in milliamps.
Calculators & MathGPS Coordinate Converter
Convert signed degrees, minutes and seconds to decimal degrees, or decimal degrees to DMS.
Calculators & MathHaversine Distance Calculator
Estimate great-circle surface distance using a spherical Earth radius of 6,371 km. This is not a road route.
Calculators & MathMouse DPI Converter
Preserve effective DPI by converting sensitivity between mouse DPI settings. Game yaw differences are not inferred.
Calculators & MathPacket Payload Calculator
Subtract entered header overhead from an MTU to estimate payload capacity. This does not discover a network path MTU.
Calculators & MathPassword Entropy Estimator
Estimate a character-pool upper bound assuming independent uniform character selection. Human-chosen passwords can have much less entropy; no crack time is claimed.
Calculators & MathResistor Color Code Calculator
Decode a four-band resistor into resistance and tolerance using standard color digits and multipliers.
Calculators & MathChoose the right calculators & math tool
Each utility lists its accepted inputs, working example and result limitations. Start with the task you need, then use the related utilities to check or transform its output.
Frequently used in this category
- Percentage Calculator — Calculate a chosen percentage of a value.
Practical guides
- How to calculate percentage change — Work through increases, decreases and the special case of a zero starting value.
Frequently asked questions
Which standard deviation should I select?
Population deviation divides variance by the number of values; sample deviation divides by one less. Select the definition appropriate to your data.
What do the interest calculators assume?
They use the entered fixed rate and stated compounding or payment schedule. They exclude fees, changing rates and jurisdiction-specific rules; results are mathematical estimates.