How do I calculate a percentage of a number?

Multiply the number by the percentage divided by 100. For 15% of 200: 200 × (15/100) = 30. Or multiply by the decimal: 200 × 0.15 = 30.

How do I calculate percentage increase or decrease?

Percentage change = ((New Value − Old Value) / Old Value) × 100. For a price that went from $80 to $100: (($100 − $80) / $80) × 100 = 25% increase.

How do I find the original price before a percentage was added?

If a price of $115 includes a 15% markup, the original is: $115 / 1.15 = $100. Divide the final amount by (1 + percentage/100) to reverse a percentage increase.

家工具Percentage Calculator

百分比计算器

Name: 百分比计算器
Rating: 4.8 (120 reviews)
Author: DailyDevTools

计算百分比和变化

什么是％的?

是 % 的?

% 变化自到?

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What is Percentage Calculator?

Percentage calculations come up constantly — tip calculations, test scores, price increases, sales tax, discount amounts, and budget allocations. DailyDevTools' Percentage Calculator handles all common percentage problems: What is X% of Y? X is what percent of Y? What is the percentage change from X to Y? — all solved instantly without needing to remember formulas.

How to use Percentage Calculator

1Select the calculation type: Percentage of a number, Percentage change, or What percent is X of Y
2Enter the values in the input fields
3The result appears instantly with the formula used clearly shown
4Use the Percentage Change calculator to compare before and after values

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