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Twenty free tools for money, health, time and the stuff that's new — EV charging costs, AI API bills, 2026 take-home pay. No sign-up, no downloads, every formula shown.

Trending

EV charging vs gasEV charging cost calculator: compare electric cost per mile against gasoline, including charging losses, and see your real yearly savings.AI API costAI API cost calculator: estimate your monthly and yearly LLM bill from requests, tokens per request, and per-million token pricing

Math

Basic calculatoronline calculator for quick everyday mathPercentage calculatorpercentage calculator: find X% of a number, what percent one number is of another, and percentage increase or decrease

Money

Loan / EMI calculatorloan calculator: enter amount, interest rate and term to get your exact monthly payment (EMI), total interest and total cost for any fixed-rate loan.Mortgage + amortizationmortgage calculator with a full year-by-year amortization schedulePaycheck take-home2026 paycheck calculatorCompound interestcompound interest calculator with monthly contributionsSalary ↔ hourlyConvert annual salary to hourly wage or hourly to salary instantlyInflationinflation calculator: see what today's money will buy in the future, what goods will cost, and how much purchasing power you lose at any inflation rate.Discountdiscount calculator: enter the original price and percent off to see the final sale price and exactly how much you saveTip & splittip calculator: work out the tip, total with tip, and each person's share when splitting the bill

Health

BMIBMI calculator in metric or imperial unitsProtein intakeprotein calculator: your daily protein target in grams based on body weight and goal — general health, regular exercise, muscle building or weight loss.Sleep cyclesleep cycle calculator: enter your wake-up or bedtime and get the best times to sleep or set your alarm, based on 90-minute sleep cycles.

Time

Ageage calculator: exact age in years, months and days from any date of birth, plus total days lived and a countdown to the next birthday.Date differencedate calculator: count the exact number of days, weeks, months and years between any two dates

Convert

Unit converterunit converter for length, weight, temperature, volume, speed and data

School

GPAGPA calculator on the 4.0 scale

Travel

Fuel trip costfuel cost calculator for road trips: enter distance, fuel economy and gas price to get total fuel cost and each person's share