The all-in-one calculator for math, finance, health, unit conversions, construction, date and time, vehicles, and developer tools. No signup, no ads, works offline.
calculator.gay
130+ calculators. Zero nonsense.
calculator.gay combines over 130 specialized calculators into one fast, free, privacy-first web app. Whether you need a scientific calculator for trigonometry and logarithms, a mortgage calculator with full amortization schedule, a BMI and calorie tracker, unit conversions across 23 categories, or developer utilities like JWT decoding and regex testing, every tool runs locally in your browser.
Standard, scientific, percentage, fraction, ratio solver, statistics, triangle solver, quadratic equation solver, linear system solver, logarithm, combinatorics, prime factorization, GCD and LCM, matrix operations, vector calculator, sequences (arithmetic, geometric, Fibonacci), and random number generator.
Mortgage with amortization, refinance breakeven, personal loan, auto loan, lease vs buy comparison, compound interest, APR to APY converter, savings goal planner, investment ROI, retirement planner, inflation calculator, bond yield, net worth tracker, crypto profit and loss, tip and split, sales tax, discount, currency converter, and fuel cost.
BMI calculator, ideal weight (Devine, Robinson, Miller, Hamwi formulas), calorie and BMR with Mifflin-St Jeor, macro splits, US Navy body fat, one-rep max estimator, running pace, VO2 max via Cooper test, heart rate training zones, sleep cycle planner, pregnancy due date, pregnancy weight gain (IOM guidelines), ovulation tracker, and water intake.
Length, weight, volume, temperature (Celsius, Fahrenheit, Kelvin, Rankine), area, speed, energy, power, pressure, force, torque, frequency, density, data storage (binary and decimal), time, angle, fuel economy, cooking volumes, cooking by weight, shoe sizes, clothing sizes, Roman numerals, and number to words.
Concrete volume and bag count, paint coverage, wallpaper rolls, roofing squares, tile and flooring, carpet, drywall, insulation R-value, lumber board feet, gravel and aggregate, mulch and soil, fence posts, brick and block, stairs (rise, run, stringer), pool volume and chemicals, HVAC sizing, solar panel sizing, Ohm's law, and wire gauge voltage drop.
Date difference, business days, age in years/months/days, timezone converter, countdown timer, work hours with earnings, day of week finder, sunrise and sunset by latitude, moon phase, and stopwatch with laps.
Zero to sixty and quarter mile estimator, tire size comparison with speedometer error, gear ratio to MPH, and towing capacity with GCWR check.
Base converter (binary, octal, decimal, hexadecimal), encoding and SHA-256 hashing, JSON formatter and validator, JWT decoder, regex tester, UUID generator, cron expression parser, Unix timestamp converter, URL parser, lorem ipsum generator, secure password generator, IP and CIDR subnet calculator, and color converter (HEX, RGB, HSL).
Privacy: every calculation runs locally with zero data transmission. Speed: instant results with no page reloads. Coverage: 130+ tools eliminate the need for separate apps. Accessibility: keyboard support, dark mode, and mobile-optimized layout. Cost: completely free with no signup, ads, or trackers.