Percentage Calculator

To find what percentage A is of B, divide A by B and multiply by 100. For example, to find what percentage 25 is of 200: (25 ÷ 200) × 100 = 12.5%. Our calculator does this automatically when you select 'What % is X of Y'.

Percentage change has a specific direction (increase or decrease) from an original value. Percentage difference compares two values without a specific reference point. For example, going from 50 to 75 is a 50% increase, while the percentage difference between them is 40%.

To calculate percentage increase: ((New Value - Original Value) ÷ Original Value) × 100. For example, if a price increases from $50 to $60: ((60-50) ÷ 50) × 100 = 20% increase.

Yes! Percentages over 100% are common. For example, if something doubles in size, that's a 100% increase. If it triples, that's a 200% increase. In our calculator, you can work with any percentage value.

To add X% to a number, multiply the number by (1 + X/100). To subtract X%, multiply by (1 - X/100). For example, adding 20% to 50: 50 × 1.20 = 60. Our calculator handles this automatically.

To find the original value before a percentage increase: Original = Final ÷ (1 + Percentage/100). Before a decrease: Original = Final ÷ (1 - Percentage/100). This is useful for finding pre-sale prices.

Because the base value changes. A 50% decrease from 100 gives you 50. But a 50% increase from 50 gives you 75, not 100. This is because percentages are always relative to the starting value.

For compound percentages, multiply the decimal forms together. For example, a 10% increase followed by a 20% increase: 1.10 × 1.20 = 1.32, or a 32% total increase. Don't just add the percentages!