All tools › Everyday calculators
The quick calculations that come up every day. Work out a percentage, a discount or a fraction, calculate your age or the days between two dates, and add up hours worked for a timesheet.
Students can calculate GPA, test grades and the score needed on a final exam. Around the house there are paint, square footage, roof pitch and fuel cost calculators. There are also converters for length, weight, temperature, cooking measurements, time zones, military time and Roman numerals, plus timers, a countdown clock and a random number generator.
Percent of a number, ratio & percent change.
½Add, subtract, multiply & divide fractions.
🏷️Sale price, savings & final total with tax.
🎂Exact age, total days lived & next-birthday countdown.
📅Days, weeks & months between any two dates.
⏱️Add/subtract hours & minutes, total timesheet lists.
⏱️Time between two times, minus breaks — for timesheets.
⏱️Weekly time card with breaks, OT & pay.
🎓Weighted GPA on a 4.0 scale from your courses & credits.
🎓What score you need on the final to hit your target grade.
✏️EZ-grader: wrong answers → score + chart.
📚Categories × weights → your real class grade.
😴Best bedtimes & wake-up times by 90-minute cycles.
🚗Enter any two, get the third.
🏃Pace per mile & km from distance + time.
⛽Estimate gas cost for any trip.
📦Area in ft² for rooms & flooring.
🎨How many gallons your walls need.
🏠Rise/run → pitch, angle & slope.
🖼️Resize dimensions keeping the ratio.
🥄Cups, tbsp, tsp, fl oz & mL — convert instantly.
🌡️Celsius, Fahrenheit & Kelvin at once.
📏Feet, meters, inches, miles & more.
⚖️Kg, lb, oz, grams & stone.
🌐Meeting times across world zones, DST handled.
🪖24-hour ⇄ AM/PM + the full chart.
ⅫNumbers ⇄ Roman numerals, both ways.
⏳Live countdown to any date — Christmas, New Year & more.
⏲️Countdown with alarm, plus a stopwatch.
🔢Pick numbers in any range, with or without repeats.
Multiply the number by the percentage and divide by 100. For example, 15% of 80 is 80 x 15 / 100 = 12. The percentage calculator also handles percentage change and 'X is what percent of Y'.
Enter your current grade, the grade you want, and how much the final is worth. The final grade calculator tells you the score you need.
A gallon typically covers about 350-400 square feet per coat. Enter your total wall length, wall height and number of coats, and the paint calculator tells you how many gallons to buy.
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