Math & Everyday
15 toolsPercentages, ratios, fractions, dates and bills — the small sums that interrupt the day.
Percentages, ratios, fractions, averages, dates and bill splitting — the small sums that interrupt a day and are annoying to do in your head.
The date tools are the ones worth bookmarking: working days between two dates, time until a deadline, and duration between two dates all get answered wrong surprisingly often by hand, because months and weekends do not divide evenly.
Age Calculator
Find exact age in years, months, days and total days lived.
Percentage Calculator
Solve percentage of, percentage change and reverse percentages.
Discount Calculator
What you actually pay after stacked discounts, coupons and tax.
Ratio Calculator
Simplify a ratio, divide an amount by it, or solve a proportion.
Average Calculator
Mean, median, mode and spread from any list of numbers.
Fraction Calculator
Add, subtract, multiply and divide fractions — exactly, not in decimals.
Time Duration Calculator
Hours worked between two times, with breaks and overnight shifts handled.
Date Difference Calculator
The gap between two dates in years, months, days — and every other unit.
Working Days Calculator
Working days between two dates, with your own week and holidays.
Business Days Calculator
Count business days between dates, excluding weekends and holidays.
Time Until Calculator
A live countdown to any date and time.
Tip Calculator
Work out a tip and split the bill, with an option to round it evenly.
Split Bill Calculator
Split a bill by what each person actually ordered, not by headcount.
Savings Calculator
How much to save each month for a goal — or what your saving will grow to.
Retirement Calculator
Whether your corpus will actually fund your retirement, in real terms.
How these tools work
Every one of these 15 tools runs entirely in your browser. There is no account to create, no file to upload and no daily limit, because the work happens on your own device rather than on a server — which also means there is nothing for us to log, cache or leak. Most of them keep working with the network off once the page has loaded.
Not finding what you need? Press ⌘K to search all 223 tools, or browse the other categories.