How is percentage increase or decrease calculated?

Subtract the original value from the new value, divide by the absolute value of the original, and multiply by 100. Formula: ((New - Old) ÷ Old) × 100.

Can I use this for test scores and grades?

Yes. Enter your scored marks as X and total marks as Y in the 'X is what % of Y?' calculator to immediately get your percentage score.

All Everyday Calculators

Everyday Math

Percentage Calculator

Solve all common percentage problems instantly: find percent values, portions, and percentage growth or decline.

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What is X% of Y?

Percentage (%)

Total Value (Y)

Result

15% of 200 is 30

X is what % of Y?

Part Value (X)

Whole Value (Y)

Result

25%

25 is 25% of 100

Δ%

Percentage Change

Initial Value

Final Value

Increase

+50%

From 80 to 120 (increase)

Mastering Percentage Calculations

Percentages are used constantly in finance, shopping sales, tips, taxes, school tests, and performance statistics. PicoFix performs precision floating-point percentage math in real time directly inside your browser.