Math calculators built for clarity.
Percentages, fractions, ratios, GPA, statistics, random numbers, and more — each tool gives you a clean answer with the working shown. No clutter, no popups, no guessing.
Featured
Start with our most-used math tools
Standard Calculator
Everyday calculator: +, −, ×, ÷, %, history, keyboard support.
Open calculatorMathScientific Calculator
Full scientific calculator with history.
Open calculatorMathPercentage Calculator
Percent of, percent change, and more.
Open calculatorMathStandard Deviation
Mean, variance, and standard deviation.
Open calculatorBrowse by topic
Pick the kind of math you need
Every tool grouped by what you're actually trying to do — from quick percentages to GPA planning.
Percentages & ratios
Everyday percent and ratio math — for shopping, school, work, and quick sanity checks.
Fractions & decimals
Convert between fractions and decimals or do arithmetic with mixed numbers.
General math & statistics
A full scientific keypad plus the stats tools you reach for most often.
School & grades
GPA, course grades, and what-if scenarios for the next test.
Time & date math
Age, date differences, hours worked — handled with full calendar awareness.
Age Calculator
Exact age in years, months, days, hours.
Time & Date →Date Difference
Days between any two dates.
Time & Date →Date Calculator
Add or subtract days, weeks, months from a date.
Time & Date →Time Calculator
Add, subtract, and convert hours, minutes, seconds.
Time & Date →Hours Calculator
Hours worked between two times — payroll-friendly.
Time & Date →Number utilities
Quick-use generators and converters that play well with math.
Learn
Short, plain-English math explainers
Quick refreshers paired with the calculators above — written to teach the idea, not just give an answer.
Percent of, percent change, percent difference
Three percent calculations that look similar but answer different questions — with examples.
Open Percentage CalculatorFractions without the headache
A clean refresher on adding, subtracting, and converting fractions to decimals.
Open Fraction CalculatorWhat standard deviation actually tells you
How spread, variance, and standard deviation describe a dataset in plain English.
Open Standard DeviationHow GPA is calculated
Weighted vs. unweighted GPA, credit hours, and how to plan for a target.
Open GPA CalculatorInstant & accurate
Calculations run in your browser the moment you type — no waiting, no round-trips.
The working, shown
Each result is paired with the formula and a short explanation, so you learn while you use it.
Private by default
Numbers stay on your device. We don't store, sell, or upload anything you type.