# Discount Calculator

> Work out sale prices, stacked discounts and how much you actually save.

To calculate a discount, enter the original price and the percentage off. If a second "extra percent off" applies, it is calculated on the already-reduced price, which is how retailers actually stack offers — the combined saving is always less than adding the two percentages.

**URL:** https://convertto.tech/t/discount-calculator
**Category:** Calculators (https://convertto.tech/c/calculators)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## How to use

1. Set the original price.
2. Set the discount.
3. Set the extra discount.
4. The result appears immediately — copy or download it.

## FAQ

### How do I combine two discounts?

Multiply, do not add. A 20% discount followed by a further 10% is not 30% — it is 0.8 × 0.9 = 0.72, so 28% off. Stacked discounts always total less than their sum.

### What does the original price mean in a sale?

Legally it must be a price genuinely charged for a meaningful period, though enforcement varies. A "was" price that was never really charged is a pricing practice regulators in the UK and EU have repeatedly acted against.

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