Calculate and convert
Convert units from miles to gallons, Fahrenheit to horsepower, calculate percentages and VAT, convert hours to decimal, Roman numerals and number systems.
Tools
- Percentage calculator Work out percentages, discounts and mark-ups.
- Unit converter Length, weight, temperature, volume, horsepower and more.
- Roman numerals Numbers to Roman numerals and back.
- Rule of three Direct and inverse proportion with working.
- Average & median Mean, median, standard deviation, quartiles.
- Swiss VAT calculator Calculate VAT with the Swiss rates.
- Time calculator Decimal hours, working time, adding up times.
- Number systems Binary, octal, decimal and hexadecimal.
- Cash discount & discount Cash discount, discounts in sequence, annual rate.
- Interest calculator Loan, compound interest and savings goal by year.