20% Off Calculator
Calculate 20% off any price. At 20% off, a $100 item costs $80.00 and you save $20.00. Enter your own price below for an exact result.
20% off common prices
| Original price | 20% off | Sale price |
|---|---|---|
| $10 | -$2.00 | $8.00 |
| $25 | -$5.00 | $20.00 |
| $50 | -$10.00 | $40.00 |
| $100 | -$20.00 | $80.00 |
| $200 | -$40.00 | $160.00 |
| $500 | -$100.00 | $400.00 |
| $1,000 | -$200.00 | $800.00 |
How to calculate 20% off
To calculate 20% off any price, multiply the original price by 0.20 to get the discount amount, then subtract that from the original price. The shortcut: multiply by 0.80 to jump directly to the sale price. For example, 20% off $80 is $64.00 — and you save $16.00.
20% off is a quick mental calculation: 20% of the price is the price divided by 5, or 10% × 2 (move the decimal, double it). So 20% off $35 = $7 off = $28 final price.
Watch out for stacked discounts. "20% off + extra 10% off" is not (20 + 10)% off — it's actually 28.0% off, because the second discount applies to the already-reduced price. This is also why "buy one, get one 20% off" is only a 10% discount on the pair, not 20% off each item.
For sellers: a 20% discount is meaningful but manageable on most product categories. If your normal gross margin is 50%, a 20% sale takes that down to 30%. Plan promotional cadence so the discount drives incremental volume rather than just rewarding customers who would have bought anyway.