Percent Off Calculator
Calculate percentage discounts
About the Percent Off Calculator
"30% off" sounds simple until you are standing in a store doing mental math, or reconciling an invoice where the discount applies to several units. The Percent Off Calculator does the arithmetic for you: enter a price, a quantity, and a discount percentage, and it returns the sale price per item, the amount saved, and the totals across all units.
Shoppers use it to see the real price behind a sign before they reach the register. Small-business owners and freelancers use it the other way — to price a bulk discount for a client and know exactly how much margin they are giving away. Quick buttons for 10%, 20%, 25%, 50%, and 75% cover the most common sale signs without typing.
How to Use the Percent Off Calculator
- Enter the original price of a single item.
- Enter the quantity you are buying (defaults to one).
- Type the discount percentage, or tap one of the quick buttons — 10%, 20%, 25%, 50%, or 75%.
- Read the per-item sale price and amount saved, both updated instantly.
- Check the "Total for X items" and "Total Amount Saved" figures, then use Copy to save the full breakdown.
How to Calculate Percentage Off (Step-by-Step)
Working out a discount by hand takes two steps. First find the amount you save by multiplying the original price by the discount percentage divided by 100. Then subtract that saving from the original price to get the sale price. The percentage is always divided by 100 because "25%" means 25 per hundred, or 0.25.
The same two steps work for any price and any percentage — the examples below run through different price points so you can see the pattern rather than memorising a single case.
- 20% off a $45 shirt: 45 × (20 ÷ 100) = $9.00 saved, so the shirt costs $36.00.
- 15% off an $80 order: 80 × (15 ÷ 100) = $12.00 saved, leaving $68.00 to pay.
- 30% off a $129.99 gadget: 129.99 × (30 ÷ 100) = $39.00 saved, bringing it to $90.99.
- 10% off a $250 fare: 250 × (10 ÷ 100) = $25.00 saved, for a final price of $225.00.
| Discount | $20 item | $50 item | $100 item |
|---|---|---|---|
| 10% off | Save $2.00 → $18.00 | Save $5.00 → $45.00 | Save $10.00 → $90.00 |
| 15% off | Save $3.00 → $17.00 | Save $7.50 → $42.50 | Save $15.00 → $85.00 |
| 20% off | Save $4.00 → $16.00 | Save $10.00 → $40.00 | Save $20.00 → $80.00 |
| 25% off | Save $5.00 → $15.00 | Save $12.50 → $37.50 | Save $25.00 → $75.00 |
| 30% off | Save $6.00 → $14.00 | Save $15.00 → $35.00 | Save $30.00 → $70.00 |
| 50% off | Save $10.00 → $10.00 | Save $25.00 → $25.00 | Save $50.00 → $50.00 |
How to Find What Percentage Off You Got
Sometimes you already know both prices — the original and the sale price on the tag — and want to know the discount percentage behind them. This is the reverse of the calculation above. Divide the sale price by the original price, subtract that from 1, then multiply by 100 to turn the result into a percentage.
For example, a jacket marked down from $80 to $52: (1 − 52 ÷ 80) × 100 = (1 − 0.65) × 100 = 35% off. To check the discount on any price pair, enter the original price above and try percentages until the sale price matches.
Why Use ToolForge’s Percent Off Calculator
- It separates per-item and total figures, so a bulk purchase shows both the unit price and what you save across every unit — not just a single discounted number.
- Five quick-percentage buttons match the discounts you actually see on sale tags, so common cases take one tap.
- Amounts are formatted to two decimals with thousands separators, matching how prices appear on a receipt.
- It runs instantly in your browser with no sign-up, so it works the moment the page loads, even on a phone in a checkout line.
Frequently Asked Questions
How do I calculate a percentage discount by hand?
Multiply the original price by the discount percentage divided by 100 to get the amount saved, then subtract that from the original price. The "How to Calculate Percentage Off" section above walks through this with several worked examples and a quick-reference table.
Does this include sales tax?
No. It calculates the discount on the price you enter, before tax. If you need the after-tax total, apply the discount here first, then run the result through a sales tax calculator.
Can I stack two discounts, like 20% then an extra 10%?
Stacked discounts are not added together — a 20% then 10% discount is not 30% off. Apply the first percentage here, take the resulting sale price, and run it through the calculator again with the second percentage to get the true stacked price.
