Percentage Calculator
Four modes to solve the most common calculations: percentage of a value, what percentage between two, change between values, and profit margin with markup.
Calculate a percentage of a value (e.g. 20% of 150 = 30)
Calculation
20% × 150 = 30
Result
30
Frequently asked questions
Everything you need to know before getting started
Margin = profit ÷ selling price. Markup = profit ÷ cost. Sell at $100, costs $60, profit $40. Margin = 40%. Markup = 66.7%. NEVER equal — confusing them has been costly for many.
Not if applied in sequence. $100 with 10% = $90, and 10% of $90 = $9. Total: $81 (19% off in the end). Use the calculator to confirm before communicating cumulative percentage.
No. $100 → +50% = $150 → -50% = $75. Percentage changes are NOT symmetric. Common error in sales presentations.
Price × (1 + tax). $100 product with 8% tax = $108. To reverse: price ÷ (1 + tax).
Both. The browser interprets 1.50 and 1,50 as the same value.
2 decimals in percentages, 4 in values. For more precision (accounting), use a tool with exact decimal arithmetic.
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