Percentage Calculator — Instant Percentage Calculations
Free online percentage calculator. Calculate percentage of a number percentage increase decrease and reverse percentages instantly with step-by-step solutions.
Percentages are used everywhere from calculating discounts during shopping to figuring out exam scores from understanding interest rates to computing tax amounts. Our percentage calculator handles all common percentage calculations instantly. Whether you need to find what is 15% of 800 or calculate the percentage increase from 200 to 250 or figure out the original price before a 30% discount just enter your numbers and get instant results.
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Percentage Calculator
Key Information
| Parameter | Details |
|---|---|
| Basic Formula | Percentage = (Part / Whole) x 100 |
| Increase Formula | New Value = Original x (1 + Percentage/100) |
| Decrease Formula | New Value = Original x (1 - Percentage/100) |
| Reverse Formula | Original = Final / (1 + Percentage/100) |
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Use Calculator NowFrequently Asked Questions
How do I calculate percentage of a number?
To calculate percentage of a number multiply the number by the percentage and divide by 100. For example 20% of 500 = 500 x 20 / 100 = 100. You can also convert the percentage to a decimal first: 20% = 0.20 then multiply 500 x 0.20 = 100.
How to calculate percentage increase?
Percentage increase = ((New Value - Old Value) / Old Value) x 100. For example if a price increased from Rs 200 to Rs 250 the percentage increase = ((250-200)/200) x 100 = 25%. This formula works for any type of increase whether prices salaries scores or quantities.
How do I reverse calculate a percentage?
To find the original value before a percentage was applied divide the final value by (1 + percentage/100). For example if an item costs Rs 1180 after 18% GST the original price = 1180 / 1.18 = Rs 1000. This is useful for removing tax or discount from a final price.
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Last updated: 24 March 2026