Calculateur de Reverse Discount
Find the original price before a known discount was applied.
Formula and method
This calculator computes Original price, Discount amount directly in your browser without sending data to an external server.
Mathematical formula
- Original price:
discount>=100 ? NaN : sale ÷ (1-discount ÷ 100) - Discount amount:
discount>=100 ? NaN : sale ÷ (1-discount ÷ 100)-sale
Variables and parameters
- Sale price (sale): default value 80 $.
- Discount (discount): default value 20 %.
Some formulas are undefined for certain input combinations (such as division by zero or logarithms of non-positive numbers). In those cases the live tool displays an alert instead of NaN.
Embed this tool
Paste this snippet into your own site or blog post to embed a live, working copy of this tool. It links back to the full page on SpecWhale.
Frequently asked questions
What equation and variables does Reverse Discount Calculator use?
Reverse Discount Calculator evaluates outputs such as <strong>Original price, Discount amount</strong> based on inputs including Sale price, Discount. Check the Mathematical Method section for the explicit formula.
What happens if I enter invalid or zero values into Reverse Discount Calculator?
If an input combination is mathematically undefined (such as division by zero or negative square roots), SpecWhale alerts you gracefully rather than returning invalid NaN outputs.
Are my calculations in Reverse Discount Calculator saved or private?
All calculations are 100% private and run locally in your Web browser. Your numbers are never uploaded to any server, but can be saved locally to your device or exported as CSV/JSON.
Is Reverse Discount Calculator free to use?
Yes. Reverse Discount Calculator is completely free, has no usage limit, and does not require an account, email, or API key.
Does Reverse Discount Calculator store or upload my data?
No. Reverse Discount Calculator calculates everything locally in your browser. Nothing you type is sent to a server or stored by SpecWhale.
How accurate is Reverse Discount Calculator?
Reverse Discount Calculator uses a standard formula (see the Method section above for the exact expression). For high-stakes financial, medical, or legal decisions, confirm the result with a professional or an authoritative source before relying on it.
Can I embed Reverse Discount Calculator on my own website?
Yes. Use the "Embed this tool" snippet on this page to add a free, working copy of Reverse Discount Calculator to your own blog post or page.