All tools
Percentage calculator
Work out a percentage of a number, what percent one is of another, a change, a discount or what it was before, with the steps. Free, with no account or uploads.
What is of ?
X% of a number
17
20% of 85 is 17.
How it is worked out
- 20% means 20 out of 100, so divide by 100: 20 ÷ 100 = 0.2
- Multiply by 85: 0.2 × 85 = 17
What do you want to work out?
X% of a numberBest for most20% of 85How much is a percentage of something.What percent is it17 of 85One number as a percentage of another.Percent change80 → 100How much something rose or fell, as a percentage.Add or take off %Discount, tax, tipA price with a discount taken off or a tax added.Before the %ReverseWhat it was before a percentage was added or taken off.Percentage of marksExamsMarks out of a total, for one subject or many.
Answers that do not end are rounded to this many places, halves up.
Worked out exactly on your device, rounded only to show it. Nothing you type is sent anywhere.
A little help along the way
Follow these steps. Every option is explained underneath. Everything is worked out in your browser; nothing is sent anywhere.
- Say what you want to work outA percentage of a number is the usual. The others are what percent one number is of another, a change, adding or taking off a percentage, the number before a percentage, and marks.
- Fill in the numbersType them into the sentence. You can type 1,250, ₹85, 12.5% or even 1/3.
- Read the answer and the workingThe answer is said in a sentence, with the steps on your own numbers and a grid of 100 squares.
Every option explained
- Rounding
- Answers are worked out exactly and rounded only to show them, halves up, to the decimal places chosen under More options.
- Percentage points
- For a change between two percentages, such as interest rates, turn on “The numbers are percentages” to have the change said in percentage points too.
- Two discounts
- Under More options, a second percentage after the first is taken from the new amount, and the page says what the two come to together.
- Marks
- Add a row for each subject for an overall percentage. When totals differ, the page also gives the average of the subjects' percentages and says how the two differ.