Discount Calculator
Apply percent-off discounts with optional tax to get final price and savings. Fully client-side — no account, uploads, or remote storage.
Added Apr 18, 2026 · Updated May 1, 2026
Input
Result
Enter a value for original price to see your result.
How it works
Calculates the final price after applying a percentage discount, with an optional tax applied after the discount.
Formula
Discounted Price = Original × (1 − Discount / 100) Final Price = Discounted × (1 + Tax / 100) Savings = Original − Discounted
Step by step
- 01Enter the original price and discount percentage.
- 02Optionally select a tax rate to apply after the discount.
- 03Discounted price = original × (1 − discount/100).
- 04Final price = discounted price + (discounted × tax/100).
Examples
20% off $100
100 × (1 − 0.20) = 80. You save $20.
Inputs
- Original Price:
- 100
- Discount (%):
- 20
- Include Tax?:
- 0
Result
- Price After Discount:
- 80
- You Save:
- 20
- Final Price:
- 80
30% off $200
200 × 0.70 = 140. You save $60.
Inputs
- Original Price:
- 200
- Discount (%):
- 30
- Include Tax?:
- 0
Result
- Price After Discount:
- 140
- You Save:
- 60
- Final Price:
- 140
Frequently asked questions
How do I calculate 20% off $100?
Multiply $100 by (1 − 0.20) = 0.80. The sale price is $80, saving you $20.
How is tax applied after a discount?
First apply the discount to get the discounted price, then multiply by (1 + tax rate/100) to get the final price.
What is the difference between a percent discount and a fixed amount off?
Percent-off scales with price (20% off $200 is $40). Fixed-amount-off removes the same dollars regardless of ticket size ($20 off is a bigger relative win on a $50 item than on a $500 item).
How do stacked coupons or employee discounts interact?
Retailers apply rules in different orders. Some stack multiplicatively, some disallow stacking, and some apply employee discounts before public coupons. Read the fine print — this tool models a single headline discount.
Is the 'saved' amount what I truly save?
It is the list-price difference before financing, shipping, or restocking fees. Your bank statement may still differ if tax is computed on pre-discount price in your jurisdiction.