Discount and sale price calculator
See the final price and what the customer saves, including what two discounts in a row really add up to. Free to use, no sign-up, and nothing you enter is stored.
Reviewed 22 October 2026
How it works
Work out the final price and the customer's saving for a sale, and check how two discounts combine. Successive discounts do not add up: 20% off followed by an extra 10% off is a 28% discount, not 30%.
Check your margin after the discount too. A discount comes entirely out of your profit, so a 20% discount on an item with a 40% margin halves the profit on that sale.
Formula
- Sale price = original price × (1 − discount ÷ 100)
- With an extra discount: final price = sale price × (1 − extra discount ÷ 100)
- Effective discount % = (original price − final price) ÷ original price × 100
Worked example
A ₹2,500 pair of shoes at 20% off sells for ₹2,000, saving the customer ₹500.
With an extra 10% off at the counter, the final price is ₹2,000 × 0.90 = ₹1,800. The total saving is ₹700, an effective discount of 28%.
How to use these calculators well
Keep every number on the same basis. If your selling price excludes GST, your cost should exclude input GST too. Mixing a tax-inclusive price with a tax-exclusive cost is the most common reason a margin looks better than it really is.
Use real numbers from your own records. Last month's bills, purchase invoices and appointment calendar give far better answers than guesses. vkRetA keeps those records for you, so the inputs for these calculators are already in your workspace.
- Values stay in your browser and are not stored
- Results are estimates for planning, not tax or accounting advice
Frequently asked questions
Why do two discounts not add up?
The second discount applies to the already reduced price. 20% off and then 10% off leaves 80% × 90% = 72% of the original price, a 28% total discount.
Is this calculator free to use?
Yes. It is free, needs no sign-up and runs in your browser. The values you enter are not submitted or stored.
Does vkRetA do this arithmetic on my bills?
Yes. On every bill vkRetA works out GST per line with the CGST and SGST or IGST split, applies coupon rules and updates stock and customer history. The calculator is for planning before you set prices.
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