Percentage Calculator
Find what is X% of Y, what percent X is of Y, and percentage change. Instant and private.
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Frequently asked questions
How do you calculate X percent of a number?
Multiply the number by the percentage as a decimal. 20% of 150 = 150 × 0.20 = 30.
How do you find what percent one number is of another?
Divide the part by the whole and multiply by 100. 30 of 150 = (30 ÷ 150) × 100 = 20%.
How is percentage increase or decrease calculated?
Subtract the old value from the new value, divide by the old value, and multiply by 100. Positive is an increase; negative is a decrease.
Legal & Accuracy Notice: This calculator is for general informational use only. It is not financial, tax, or professional advice. No personal data is collected — all math runs in your browser.