Everyday calculators
Ages and dates, hours worked, grades, tips, fuel, unit conversions and more.
- Age calculatorExact age in years, months and days, and your next birthday.
- Date calculatorDays between two dates, or add and subtract days from a date.
- Time calculatorAdd or subtract hours, minutes and seconds, or add time to a clock time.
- Hours calculatorA weekly time card: hours worked from start and end times.
- Time zone converterConvert a time between time zones, with daylight saving handled.
- Unit converterLength, weight, temperature, volume, area, speed, data and more.
- Tip calculatorWork out the tip and split the bill between friends.
- GPA calculatorSemester and cumulative GPA on the 4.0 scale.
- Grade calculatorWhat you need on the final, or your weighted average grade.
- Fuel cost calculatorWhat a trip costs in fuel, in miles per gallon or litres per 100 km.
- Electricity cost calculatorWhat an appliance costs to run per day, month and year.
- Concrete calculatorConcrete volume for slabs and columns, and how many bags to buy.
- Sleep calculatorBedtimes and wake-up times that fit whole sleep cycles.
- Roman numeral converterNumbers to Roman numerals and back, with the breakdown.