Free Online Calculators — Fast, Accurate, No Sign-Up Required

Mortgages, loans, retirement, savings, and everyday money calculators.

BMI, calories, body fat, due dates, and fitness tracking tools.

Percentages, fractions, statistics, and everyday math made simple.

Calculate ages, dates, durations, and time zones.

Convert colors and check image aspect ratios for design work.

Tips, unit conversions, sales tax, and everyday quick tools.

Home wiring, solar sizing, and electronics circuit calculators.

Water heaters, pipe sizing, tanks, and pressure calculators.

Estimate materials for flooring, paint, concrete, fencing, and more.

Car loans, gas mileage, depreciation, and EV cost calculators.

Self-employment tax, 1099 vs W2, freelance rates, and profit margins.

Passwords, JSON, regex, binary, and other dev utilities.