Percentage Calculator
Eight useful percentage calculations, with clear formulas and worked steps.
GSTCalculators.in · Percentage Calculator
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Percentage of a number
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How to use this calculator
Choose a calculation, enter your values and select Calculate. Use Load example for a worked example. Switch tools without losing the values you entered.
General mathematical results. Rounding may differ from a school, invoice or financial system.
Frequently Asked Questions
How do I calculate a percentage?
Divide the part by the whole and multiply by 100. For example, 30 out of 150 is 20%. To find 20% of 500, multiply 500 by 20 and divide by 100: the answer is 100.
How are percentage change and percentage difference different?
Percentage change uses the original value as the baseline. Percentage difference uses the average of two values. From 80 to 100 is a 25% increase, but their percentage difference is about 22.22%. Change requires a positive original value; difference accepts nonnegative values, except two zeroes.
Can I add two successive discounts together?
No. Each discount applies to the remaining price. A 20% discount followed by 10% gives a total discount of 28%, not 30%. Leave the second discount blank for a single discount.
How do I recover the value before a percentage change?
Divide the final value by 1 plus the increase rate, or 1 minus the decrease rate, written as a decimal. After a 20% decrease, a final value of 800 gives 800 ÷ 0.8 = 1,000. A 100% decrease cannot be reversed uniquely.