Percentage Calculator FAQ

Use (new − old) / old × 100. For example, if a value rises from 80 to 100, the increase is ((100 − 80) / 80) × 100 = 25%. A negative result means a decrease rather than an increase.

Use (percentage / 100) × base value. For example, 25% of 200 is (25 / 100) × 200 = 50. You can also think of it as multiplying the base by the decimal form of the percentage.

Use the same formulas in any spreadsheet. For what percent, use =A1/B1*100. For percent of a number, use =A1*B1/100. For percentage change, use =(B1-A1)/A1*100. Most spreadsheet programs use the same arithmetic so you can copy the formulas shown in the reference panel.

Percentage increase uses a start value and an end value to measure growth or decline from a known starting point. Percentage difference compares two values against their average, which is useful when neither value is the clear starting point. The two methods give different results for the same pair of numbers.

A change from 35% to 40% is 5 percentage points, not a 5% increase. The relative increase is (40 − 35) / 35 × 100 ≈ 14.3%. Percentage points measure the arithmetic difference between two percentages, while percent change measures the relative difference.

Yes, the discount mode calculates the sale price after a percentage off the original price. For product pricing scenarios like comparing markup percentage versus margin percentage, or for batch export workflows, open the Markup Calculator which is designed specifically for those use cases.