Math Tools
6 free calculators for everyday math, fractions, percentages, scientific functions, dates, and randomness.
Percentage Calculator
6 modes — what percent, % of, % change, % increase/decrease.
Open →Scientific Calculator
sin/cos/tan/log/ln/exp/fact. RAD/DEG modes. Keyboard input.
Open →Fraction Calculator
Add, subtract, multiply, divide fractions with simplification.
Open →Age Calculator
Exact age in years, months, days, hours, minutes from birth date.
Open →Date Calculator
Days between dates or add/subtract days, weeks, months, years.
Open →Random Number Generator
Pick numbers from a range or draw winners from a list. Cryptographically secure.
Open →About math tools
All calculators use validated formulas. The scientific calculator handles trig, logs, exponentials, and factorials with keyboard input. The percentage calculator has 6 different modes covering every common scenario. The random number generator uses the browser's crypto API for fair draws.