In a jam?
Every calculator here gives you the number and the arithmetic that produced it. No sign-ups, no lead forms, no email capture. No answer you have to take on faith.
96%
(90 − 88 × 0.75) ÷ 0.25 = 96
Skip the final entirely and you finish the course at 66%.
Four calculators, and what each one shows you
- Percentage What is 15% of 80? And every other way of asking it. 80 × 15 ÷ 100 = 12
- Tip The tip, the total, and what each person owes to the cent. $84.20 × 20% = $16.84
- Final grade What you need on the final, and where you land if you skip it. (90 − 88 × 0.75) ÷ 0.25 = 96
- Age Exact age in years, months and days. Leap-day birthdays handled. borrow from the prior month
Why the work is shown
A number on its own is something you have to trust. A number with its arithmetic beside it is something you can check, and correct if we have it wrong. Every page states the formula it uses, the limits it accepts, the conventions it follows where maths allows more than one, and the date it was last updated.
Read the editorial policy for how these pages are built and tested.