Percentage increase and decrease calculator
Find the percentage increase or decrease between an old and a new value, such as last month's sales and this month's, or a price before and after a rise. You can also add or take off a percentage, or find the value before a change.
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How to use the Percentage Calculator
- 1Pick the question you want to answer, such as "What is X% of Y?" or "Percentage change".
- 2Type the two numbers. The answer updates as you type.
- 3Read the formula under the result to see how it was worked out.
- 4Copy the answer, or switch questions; your numbers carry over where they fit.
Frequently asked questions
What is the formula for percentage increase?
(new − old) ÷ old × 100. From 80 to 100 is (100 − 80) ÷ 80 × 100 = 25%. A negative answer means a decrease.
How do I find the original price before a percentage increase?
Divide the new price by 1 plus the increase. If a price is £120 after a 20% rise, the original was £120 ÷ 1.2 = £100.
How do I calculate growth over several months?
Compare the last value with the first for the total change. For an average monthly rate, take (last ÷ first) to the power of 1 ÷ months, subtract 1 and multiply by 100.
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