Percentage Calculator

Switch between the three tabs to solve the most common percentage problems without formulas. The Basic Percentage tab determines what percent a part is of a whole, the % Change tab measures increases or decreases, and the % of Number tab multiplies a number by any percentage. Each calculation is mobile friendly and updates the result panel instantly.

Enter clean numeric values, press the corresponding calculate button, and watch the text summary explain your answer in plain language. The reset buttons let you run new scenarios quickly, making this free online percentage calculator perfect for shopping, grades, and analytics.

The tool applies three standard formulas: (part ÷ whole) × 100 for basic percentages,((new − old) ÷ old) × 100 for percentage change, and percentage × number ÷ 100when finding X% of Y. Knowing the structure helps you double-check spreadsheets or homework by hand.

For example, if sales increased from 8,400 to 9,900 units, the calculator returns ((9,900 − 8,400) ÷ 8,400) × 100 = 17.86% growth. Entering 18% of 245 immediately shows 44.10, which is useful for commissions or gratuity calculations when you are on the go.

Professionals rely on percentage calculations for discount planning, markup analysis, and KPI tracking. The calculator also supports students who need to determine exam weights or compare scores across classes. Because every tab accepts decimals, you can work with precise financial values or fractional grade points.

Remember that percentages always compare against a defined whole. When the reference number changes, recalculate to keep your insights accurate. For currency conversions or budget splits, pair this tool with the discount and tip calculators linked below.