Add or Subtract Percentage Calculator

Q: "How do I add X% to a value?"

"Result = value × (1 + X/100). Example: 100 + 20% = 100 × 1.20 = 120."

Q: "How do I subtract X% from a value?"

"Result = value × (1 − X/100). Example: 100 − 15% = 100 × 0.85 = 85."

Q: "Is \"add 20%\" the same as \"multiply by 1.2\"?"

"Yes. Adding 20% to 100 gives 120; 100 × 1.2 = 120."

Q: "Useful for VAT or discount?"

"Yes. Add percent for VAT (e.g. +20%). Subtract percent for discount (e.g. −15%)."

Q: "What units does the result have?"

"Same as the original value (e.g. dollars, kg)."

Add or subtract X% from a value. Example: 100 + 20% → 120; 100 − 15% → 85. Copy result.

Add or subtract a percentage from a value. Add X%: result = value × (1 + X/100). Subtract X%: result = value × (1 − X/100). Enter the value and the percentage, and choose Add or Subtract. Copy the result or Copy with labels.

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Examples

100 + 20% → 120
100 − 15% → 85
50 + 10% → 55

FAQ

How do I add X% to a value?

Result = value × (1 + X/100). Example: 100 + 20% = 100 × 1.20 = 120.

How do I subtract X% from a value?

Result = value × (1 − X/100). Example: 100 − 15% = 100 × 0.85 = 85.

Is "add 20%" the same as "multiply by 1.2"?

Yes. Adding 20% to 100 gives 120; 100 × 1.2 = 120.

Useful for VAT or discount?

Yes. Add percent for VAT (e.g. +20%). Subtract percent for discount (e.g. −15%).

What units does the result have?

Same as the original value (e.g. dollars, kg).