Free Online Tools
Calculators
Handy calculators for everyday needs — health, finance, time, science, and unit conversions.
All Calculators
Unit Converter
PopularConvert between length, weight, temperature and more
BMI Calculator
Calculate Body Mass Index
Percentage Calculator
Calculate percentages easily
Age Calculator
Calculate exact age from date of birth
Date Difference
Calculate days between two dates
Currency Converter
Convert between 150+ world currencies
Tip Calculator
Calculate tip and split the bill
Scientific Calculator
Full scientific calculator in your browser
Discount Calculator
Calculate discount price and savings
Loan Calculator
Calculate monthly payments and interest
Speed Calculator
Calculate speed, distance, and time
About Calculators
SimplyToolbox's free calculator collection gives you instant answers for common everyday calculations. Calculate your BMI and understand your health category, estimate monthly loan repayments with the loan calculator, convert between currencies using live exchange rates, convert any unit of measurement, calculate the number of days between two dates, figure out discounts and sale prices, calculate tips at restaurants, or use the full scientific calculator for advanced math. All calculators work instantly in your browser with no signup needed.
100% Private
All processing happens in your browser. Your files are never uploaded to our servers.
Instant Processing
No waiting for server responses. Tools run immediately using WebAssembly technology.
Always Free
No subscriptions, no watermarks, no file size limits. Every tool is free forever.