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📊 Percentage & Shopping Math Calculator

Calculate percentages, percent change, sale price, tip split, and unit price comparison.

Enter 20 for 20%. Percent change returns relative change, not percentage points. Discount, tax, tip, and unit price modes only calculate user-entered arithmetic; they do not look up or judge regional taxes, legal, financial, or shopping outcomes.

Find the value of X% of Y.

Calculate what percent A is of B.

Find the base value when A is P% of it.

Calculate the relative percentage change from A to B using the standard formula.

Use user-entered original price, discount, quantity, and optional tax rate to estimate sale totals. The tax field is arithmetic only and does not represent any regional tax rule.

Use user-entered bill amount, tip percent, group size, and rounding mode to calculate tip and per-person amounts. Results are payment arithmetic only.

Compare user-entered unit prices for two packages. This only calculates price / quantity and does not judge product quality, shipping, coupons, taxes, or purchase decisions.

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Free online percentage and shopping math calculator for finding X% of Y, percent share, reverse percent, percent change, sale price, tip split, and unit price comparison. Uses only user-entered values in your browser and does not provide tax, legal, financial, or shopping advice.