Discount Calculator
Find the final sale price, the original price, or the exact discount percentage — whichever two numbers you know, this calculator finds the third.
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How Discount Calculator Works
Three Ways to Calculate a Discount
This calculator handles the three questions people actually search for when a discount is involved — depending on which two numbers you already know, pick the matching tab:
- Find Final Price — you know the original price and the discount percentage, and want the sale price.
- Find Original Price — you know the sale price you paid and the discount percentage, and want to reverse-calculate what it cost before the discount.
- Find Discount % — you know both the original and final price, and want to know what percentage off that actually was.
Formulas
1. Final Price from Original Price + Discount %
Discount Amount = Original Price × Discount % ÷ 100
Final Price = Original Price − Discount Amount
Example: ₹1,000 item at 25% off:
Discount = 1000 × 25 ÷ 100 = ₹250
Final Price = 1000 − 250 = ₹750
2. Original Price from Final Price + Discount %
Original Price = Final Price ÷ (1 − Discount % ÷ 100)
Example: You paid ₹750 after a 25% discount:
Original = 750 ÷ (1 − 0.25) = 750 ÷ 0.75 = ₹1,000
3. Discount % from Original Price + Final Price
Discount % = (Original Price − Final Price) ÷ Original Price × 100
Example: A ₹1,000 item now selling for ₹750:
Discount = (1000 − 750) ÷ 1000 × 100 = 25%
A Note on "Find Original Price"
This mode only accepts discount percentages up to (but not including) 100% — a 100%-off item was free, and there's no single original price that can be reconstructed by dividing by zero. For anything short of a full giveaway, the formula works in reverse cleanly.
When the "Discount" Is Actually a Markup
In "Find Discount %" mode, if the final price you enter is higher than the original price, the result shows as a price increase rather than a discount — useful for checking whether a "sale" price actually went up compared to an earlier price you remember paying.
Related Tools
Once you've worked out the discount, the Tip Calculator and GST Calculator can help with tax or tipping on the final price, and the Percentage Calculator covers other percentage math this tool doesn't.
Accuracy & Sources
Last reviewed: August 2026. Formula source: Standard percentage-discount calculation convention. All calculations run in your browser. No data is sent to any server.
Frequently Asked Questions
Discount Amount = Original Price × Discount Percentage ÷ 100. For example, 25% off a ₹1,000 item is 1000 × 25 ÷ 100 = ₹250, making the final price ₹1,000 − ₹250 = ₹750.
Yes — use the 'Find Original Price' tab. Enter the price you actually paid and the discount percentage, and the calculator divides by (1 − discount% ÷ 100) to recover the pre-discount price.
Use the 'Find Discount %' tab and enter both the original and final price. The calculator computes (Original − Final) ÷ Original × 100 — useful for checking whether an advertised 'up to 50% off' actually applied that rate to a specific item.
A 100% discount means the item was free, and there's no single original price that can be mathematically reconstructed from a final price of zero — the formula would require dividing by zero. 'Find Final Price' mode does allow 100% (it correctly computes a final price of zero); only the reverse direction is restricted.
In 'Find Discount %' mode, that's treated as a price increase rather than a discount, and the result is labeled 'Price Increased' instead of showing a discount percentage — useful for spotting a 'sale' that isn't actually a discount at all.
Yes — select 'Custom percentage' from the dropdown in the 'Find Final Price' or 'Find Original Price' tabs and a text field appears for any percentage from 0 up to just under 100%.