Percentage Calculator

A percentage is a number or ratio expressed as a fraction of 100. It is denoted using the percent sign '%' and represents a portion of a whole.

Divide the part by the total whole and multiply by 100. For example, 25 out of 200 is (25 ÷ 200) × 100 = 12.5%.

To find 10% of any number, move the decimal point one position to the left, or multiply the number by 0.10. For example, 10% of 250 is 25.

Multiply the number by 0.20 or calculate 10% and double it. For example, 20% of 500 is 100.

Divide the smaller number (or part) by the total number and multiply by 100. Formula: (Value ÷ Total) × 100.

Subtract the original value from the new value, divide by the original value, and multiply by 100. Formula: ((New − Original) ÷ Original) × 100.

Subtract the new value from the original value, divide by the original value, and multiply by 100.

Percentage change compares an old value to a new value chronologically. Percentage difference compares two values without a chronological order by dividing the absolute difference by their average.

Multiply the original price by the discount percentage divided by 100 to find your savings, then subtract that amount from the original price.

Divide the discounted price by (1 − discount percentage ÷ 100). For example, $80 after a 20% discount is $80 ÷ 0.80 = $100.

Multiply the wholesale cost by (1 + markup percentage ÷ 100). For example, a $100 item marked up 25% has a selling price of $125.

Subtract cost price from selling price to get profit, then divide profit by the cost price and multiply by 100.

Subtract selling price from cost price to get loss, then divide loss by the cost price and multiply by 100.

Multiply the bill amount by the tip percentage (e.g., 0.15, 0.18, 0.20) and add the result to the bill to obtain the total amount.

Divide the total marks obtained by the maximum marks possible and multiply by 100. For example, 450 ÷ 500 × 100 = 90%.

Sum the earned points or weighted categories, divide by the total possible points, and multiply by 100.

Percentage points measure the absolute arithmetic difference between two percentages (e.g. 40% to 50% is 10 percentage points), whereas percent change measures relative growth (a 25% relative increase).

Yes. All formulas in this calculator handle decimal inputs and floating point fractions accurately.

Yes. Negative percentages represent reductions, decreases, or financial losses below the original benchmark.

All calculations use standard IEEE-754 double-precision floating-point arithmetic with configurable decimal rounding.

No. All calculations run strictly in your browser. Recent history and favorites are stored only on your device using local storage.

Yes. Once loaded, this page requires no active internet connection or external APIs to calculate.