Math CalculatorsQuick Answers for Everyday Numbers
Clean, fast math tools for percentage calculations, unit conversions, GPA tracking, scientific functions, and discount pricing. No setup, no account needed.
All Math Tools
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Percentage Calculator
4 calculation modes: percent of a number, percent change, what percent X is of Y, and reverse percentage.
Open calculatorUnit Converter
Convert between 60+ units across length, weight, temperature, volume, speed, area & more.
Open calculatorGPA Calculator
Calculate cumulative GPA, semester GPA, and find the grades needed to hit your target.
Open calculatorScientific Calculator
Trigonometric functions, logarithms, powers, factorials, constants & DEG/RAD mode.
Open calculatorDiscount Calculator
Find the final price after any percentage discount or coupon — or reverse-calculate the original price.
Open calculatorCommon Use Cases
The right tool for each situation
Shopping & Sales
Percentage off, sale price after discount, tax included total — all instant.
Discount CalculatorTravel & International
Convert km to miles, kg to lbs, Celsius to Fahrenheit — 60+ unit pairs covered.
Unit ConverterSchool & College
Track your GPA, model grade scenarios, and plan the grades needed to graduate with honors.
GPA CalculatorWork & Finance
Percentage change, growth rates, markup — the calculations behind every business report.
Percentage CalculatorAbout These Calculators
The math tools here cover the calculations that come up repeatedly in everyday life — the ones that take just long enough to be annoying but are too common to ignore. Percentage calculations appear everywhere: tip amounts, sale prices, grade points, tax rates, and investment returns all require the same underlying formula.
The Unit Converter covers 60+ conversion pairs across 9 measurement categories. Unlike single-purpose converters, it handles the full range you'll actually need: metric-to-imperial for travel, cooking conversions, temperature for recipes, and speed for running or driving.
The Scientific Calculator supports trigonometric functions (sin, cos, tan and their inverses), natural and base-10 logarithms, power and root operations, factorials, and mathematical constants. It works in both DEG and RAD mode, making it suitable for physics, engineering, and pre-calculus coursework.
The GPA Calculator is particularly useful for understanding what grades are needed going forward to hit a target GPA — a question that's hard to answer by hand but trivial with the right tool.