Percentage Calculator
Six handy percentage calculators — pick the one you need
What is X% of Y?
% of
X is what % of Y?
of
Percentage Change (Increase / Decrease)
Add or Remove a Percentage
Find Original Value (Reverse %)
Given final value after a % increase or decrease, find the original.
Percentage Difference Between Two Values
Symmetric difference — neither value is treated as the "original".
vs
Frequently Asked Questions
Divide the part by the whole and multiply by 100. Formula: (X ÷ Y) × 100. Example: 80 is what % of 200? → (80 ÷ 200) × 100 = 40%.
Formula: ((New − Original) ÷ Original) × 100. Example: price went from 100 to 150 → ((150 − 100) ÷ 100) × 100 = 50% increase.
Percentage change has a clear "before" and "after" — it shows how much a value changed relative to the original. Percentage difference is symmetric — it compares two values without either being the reference point, using their average as the denominator: |A − B| ÷ ((A + B) / 2) × 100.
Use the "Find Original Value" calculator (calculator 5). If a product now costs ₹850 after a 15% discount, the original was ₹850 ÷ (1 − 0.15) = ₹1,000. Formula: Final ÷ (1 − discount%/100).
Multiply the number by (1 + percentage/100). Example: add 18% GST to ₹1,000 → 1000 × 1.18 = ₹1,180. To remove a percentage: multiply by (1 − percentage/100). Example: remove 18% from ₹1,180 → 1180 ÷ 1.18 = ₹1,000.
100% of any number equals the number itself (the whole thing). 50% = half. 200% = double. Percentages above 100 mean the result is greater than the original. For example, 150% of 200 = 300.
About This Percentage Calculator
This free Percentage Calculator covers six common percentage problems — all calculated instantly in your browser. Whether you need to find a percentage of a number, calculate how much prices changed, reverse-calculate an original value, or compare two numbers, this tool has you covered.
| Calculator | Formula | Example |
|---|---|---|
| X% of Y | (X / 100) × Y | 20% of 500 = 100 |
| X is what % of Y | (X / Y) × 100 | 80 is 40% of 200 |
| % Change | ((New − Old) / Old) × 100 | 100→150 = +50% |
| Add % | N × (1 + P/100) | 1000 + 18% = 1180 |
| Remove % | N × (1 − P/100) | 1180 − 18% ≈ 967.6 |
| Reverse % | Final / (1 ± P/100) | 1180 after +18% → orig = 1000 |
| % Difference | |A−B| / ((A+B)/2) × 100 | |80−120| / 100 × 100 = 40% |
