18 calculators for math, fitness, cooking, life events, school and recipe scaling.
No sign-up. No tracking. No ads.
Find out how much your meetings actually cost. Enter attendees, salaries, and duration.
Resize images and videos keeping proportions. Presets for YouTube, Reels, Instagram, DSLR.
Convert between units instantly. Length, weight, temperature, area, volume, speed, data size, time, CSS.
Convert between binary, octal, decimal, and hex. Live-linked fields. Bitwise inspector.
BMI, BMR, ideal weight, TDEE, and macros. Metric or imperial. US Navy body-fat method.
Convert between Roman numerals and regular numbers. Supports extended notation up to 3,999,999.
Three calculators in one: X % of Y, what % is X of Y, and percentage increase/decrease between two numbers.
Generate random integers in any range, one-off or in batch. Cryptographically random, unique option.
Convert between Celsius, Fahrenheit, Kelvin and Rankine. Live three-way conversion as you type.
Spell out any integer in English, from zero to quadrillions. Useful for cheques, legal text, and invoices.
Daily calorie needs using Mifflin-St Jeor. Activity multipliers + targets for cutting, maintaining and bulking.
Calculate due date and current pregnancy week from LMP or conception. Trimester breakdown + milestones.
Pace ↔ time ↔ distance. Split tables for 5K, 10K, half-marathon, marathon at any pace you set.
Cups ↔ grams ↔ ml ↔ oz with per-ingredient density. Plus °C / °F / gas-mark for oven temps.
Wake at the end of a 90-minute cycle (not mid-cycle). Bedtime suggestions or wake-time options.
Unweighted (4.0) + weighted (5.0) GPA from courses, grades, credits, and AP / honors / college flags.
MPG (US + UK), L/100km, km/L, cost-per-mile, full trip cost. Multi-currency.
Paste any recipe, change servings — every ingredient quantity scales. Fraction-aware, decimals or pretty fractions.
Mean, median, mode, range, sum and count from any list of numbers.
Add up work time from start/end rows, subtract breaks. Total in h:mm and decimal hours.
Simplify fractions, fraction to decimal and decimal to fraction, mixed numbers.
Simplify ratios to lowest terms and solve proportions A:B = C:?. Scale mixes and recipes.
Convert numbers to/from scientific, E-notation and engineering notation.
A broad collection of free online calculators for math, fitness, cooking, life events, school, finance and everyday conversions. From the basics (percentage, temperature, BMI) to the specialized (TDEE, running pace, recipe scaling, Roman numerals). Browser-based, no sign-up, no ads.
Yes — every calculator in this category is free, no sign-up, no usage limits. No data is uploaded; every calculation runs in your browser.
Yes — BMI, cooking, running pace, gas mileage and the unit converter all support both. Temperature converter handles Celsius, Fahrenheit, Kelvin and Rankine.
The BMI / TDEE calculators use Mifflin-St Jeor (the most accurate formula for general populations) and standard activity multipliers. They're informational; consult a doctor for medical decisions.
For most tools, no — the inputs are local to your browser. The few that benefit from sharing (random number generator with a seed, for example) explicitly support it.