Calculate percentages, increases, decreases, and differences instantly with our AI-powered calculator.
Formula: (X / 100) × Y
This calculation shows what X% of Y is.
Formula: (X / Y) × 100
This calculation shows the percentage that X represents of Y.
Formula: ((New - Original) / Original) × 100
Change: 0 (no change)
Formula: |(Value1 - Value2)| / ((Value1 + Value2)/2) × 100
Absolute Difference: 0
Percentages hide inside everyday questions: What is 15% of my bill? What grade is 42 out of 50? How much did sales grow this quarter? This page answers all of them with four focused calculators, each showing the exact formula it uses so you can see how the answer is reached.
The first finds a percentage of any number — type the percent and the base value to get the result of (X ÷ 100) × Y. The second works in reverse, telling you what percentage one number is of another. The third measures percentage change between an original and a new value, the standard way to express growth or decline in prices, scores and revenue. The fourth calculates percentage difference between two values, comparing them against their average — the right choice when neither number is the "original."
Every calculator runs instantly in your browser with nothing to install. Whether you are checking a discount, a tax amount, an exam score or a business metric, pick the calculation that matches your question and get the answer in seconds — free, with no sign-up.
Use the first calculator: it applies the formula (X ÷ 100) × Y, so 20% of 150 gives 30.
Use the second calculator — it divides the part by the whole and multiplies by 100: (X ÷ Y) × 100.
Change compares a new value to the original: ((New − Original) ÷ Original) × 100. Difference compares two values against their average, when neither is the starting point.
Yes — all four calculators are free with no sign-up.