Free online calculators
Quick, accurate answers for everyday maths. Every calculator shows how it got the result and runs entirely in your browser.
Every tool on ToolboxHere is free, needs no account and runs on your device. New tools are added as people ask for them; suggest one.
About the calculators
These calculators answer the everyday questions people search for: a percentage of a number and a percentage change, a sum with a full history, scientific functions, a grade point average on the credit-hour system Pakistani universities use, and the date calculations that are surprisingly hard to do in your head, the days between two dates, an age in years, months and days, a date plus a number of working days, hours between two times, and the ISO week number. Each one shows its working next to the result, so you can check the method rather than trust a number.
Dates are calculated as whole days on a calendar, never through the clock, so daylight-saving changes and time zones cannot shift a result by a day. Working-day calculations let you choose the weekend your country uses, Friday and Saturday in the Gulf or Saturday and Sunday elsewhere, and add public holidays. The basic calculator uses exact decimal arithmetic, so 0.1 plus 0.2 is 0.3, and its percent key works the way a phone’s does.
Frequently asked questions
Is anything I type saved or sent?
No. The figures are worked out in your browser and forgotten when you close the tab. The pages keep no account and set no cookie of their own.
How does the age calculator count months and days?
As whole calendar days: full years first, then full months, then the days left over, with month ends clamped the way registries do it (31 January plus one month is the last day of February). The total number of days is shown as well.
Which weekend does the working-days calculator use?
It starts from your time zone’s convention, Friday and Saturday in the Gulf and Egypt, Saturday and Sunday elsewhere, and you can change it. Public holidays are added by hand, because they differ by country and year.
Why does the percentage calculator show the working?
So that you can check it and reuse the method. Percentage questions are easy to set up backwards; seeing “25 of 80 is 31.25%” next to the formula makes the mistake obvious.
Which tool do I need?
- Quick sums, with a history
- Calculator; Scientific Calculator for functions
- Percent of, percent off, percentage change
- Percentage Calculator
- Days, weeks or working days between two dates
- Days Between Dates, Working Days Calculator
- Someone’s exact age, or a date plus some days
- Age Calculator, Add Days to a Date
- Hours worked, or this week’s number
- Hours Calculator, Week Number
- GPA and CGPA
- CGPA Calculator, CGPA to Percentage