Quick rule: for 20% off, multiply the price by 0.8; for 30% off, by 0.7. Sales tax is charged on the reduced price.
How to use the Percent Off Calculator
- Original price
- Percent off
- Quantity
- Sales tax
Results update as you type, and every field accepts the units shown in its menu.
How it works
Enter the price, the percent off, the quantity and the sales tax.
Tips
- Know the difference between margin (profit ÷ price) and markup (profit ÷ cost).
- Apply successive discounts one after another – they do not simply add up.
- Check whether prices already include sales tax or VAT.
- Round prices only at the very end of the calculation.
Common mistakes to avoid
- Adding discount percentages together.
- Pricing from a target margin using the markup formula.
- Forgetting payment-processing and shipping fees.
Inputs explained
| Field | What to enter |
|---|---|
| Original price | Amount in your currency |
| Percent off | In % |
| Quantity | A number |
| Sales tax | In % |
What each result means
- Sale price per item = [Original price]×(1 – [Percent off]÷100)
- Total to pay (with tax) = [Sale price per item]×[Quantity]×(1 + [Sales tax]÷100)
- You save = ([Original price] – [Sale price per item])×[Quantity]
- Sales tax = [Sale price per item]×[Quantity]×[Sales tax]÷100
Example values
How the main result changes when Original price changes and everything else stays at the example values above:
| Original price | Total to pay (with tax) |
|---|---|
| 25 | 17.5 |
| 37.5 | 26.25 |
| 50 | 35 |
| 62.5 | 43.75 |
| 75 | 52.5 |
| 100 | 70 |
Formula
Sale price = price × (1 − percent off)With tax = sale price × (1 + tax)Saving = price − sale priceWorked example
Inputs — Original price: $50; Percent off: 30 %; Quantity: 1; Sales tax: 0 %.
Results — Sale price per item = $35.00; Total to pay (with tax) = $35.00; You save = $15.00; Sales tax = $0.00.
Frequently asked questions
What is 30% off $50?
$35 – you save $15.
How do I calculate percent off quickly?
Multiply by (1 − percentage), e.g. × 0.7 for 30% off.
Is tax calculated before or after the discount?
After – on the discounted price.
What formula does the Percent Off Calculator use?
Sale price = price × (1 − percent off).