30% Off Calculator
Calculate 30% off any price. At 30% off, a $100 item costs $70.00 and you save $30.00. Enter your own price below for an exact result.
30% off common prices
| Original price | 30% off | Sale price |
|---|---|---|
| $10 | -$3.00 | $7.00 |
| $25 | -$7.50 | $17.50 |
| $50 | -$15.00 | $35.00 |
| $100 | -$30.00 | $70.00 |
| $200 | -$60.00 | $140.00 |
| $500 | -$150.00 | $350.00 |
| $1,000 | -$300.00 | $700.00 |
How to calculate 30% off
To calculate 30% off any price, multiply the original price by 0.30 to get the discount amount, then subtract that from the original price. The shortcut: multiply by 0.70 to jump directly to the sale price. For example, 30% off $80 is $56.00 — and you save $24.00.
To do 30% off in your head: take 10% (move the decimal one place left), multiply by 3.0, then subtract from the original price.
Watch out for stacked discounts. "30% off + extra 10% off" is not (30 + 10)% off — it's actually 37.0% off, because the second discount applies to the already-reduced price. This is also why "buy one, get one 30% off" is only a 15% discount on the pair, not 30% off each item.
For sellers: a 30% discount is meaningful but manageable on most product categories. If your normal gross margin is 50%, a 30% sale takes that down to 20%. Plan promotional cadence so the discount drives incremental volume rather than just rewarding customers who would have bought anyway.