HomeMath & Everyday
Math & Everyday
Everyday arithmetic, percentages, fractions, and classroom tools.
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Basic Calculator
Everyday arithmetic with full keypad entry.
Advanced
Scientific Calculator
Trig, logs, powers, and constants via expression input.
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Percentage Calculator
Percent of a value, share of total, or change over time.
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Fraction Calculator
Add, subtract, multiply, or divide two fractions.
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Discount Calculator
Sale price, savings, and stacked discounts.
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Time Duration Calculator
Add a duration to a time, or find the gap between two.
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Random Number Generator
Generate random integers in any range, with or without repeats.
Students
GPA Calculator
Weighted grade point average across your courses.
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Grade Calculator
Weighted final score and letter grade from assignments.
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Stopwatch & Timer
A precise stopwatch with laps, plus a countdown timer.
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Prime Number Checker
Check primality, factor a number, or list primes up to N.
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Statistics Calculator
Mean, median, mode, range, and standard deviation from a data set.
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Matrix Calculator
Add, multiply, transpose, invert, or find the determinant.
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Chess ELO Calculator
Expected score and rating change after a rated game.