Discount Calculator

Calculate sale prices, savings and discount percentages instantly

Currency:

Calculate Sale Price

Original Price $100.00

$0$10k

Discount Percentage 20% off

0%100%

Second Discount (stacked, optional) 0%

0%50%

Sale Price

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Enter details above to calculate

Original

—

You Save

—

% Off

—

// Price Split

You Pay

Save

You Pay: —

You Save: —

// Compare Discount Levels

Discount	You Save	Sale Price	vs Current

How to Use the Discount Calculator

Choose what you want to calculate using the tabs above. Sale Price — enter the original price and discount percentage to find the sale price. Original Price — enter the sale price and discount percentage to work out what the original price was. Find % Off — enter both prices to calculate the discount percentage.

Discount Formulas

Sale Price (original → discounted): Sale Price = Original × (1 − Discount% / 100) Saving = Original × (Discount% / 100) Original Price (sale → original): Original = Sale Price / (1 − Discount% / 100) Find % Off (both prices known): Discount% = ((Original − Sale) / Original) × 100 Stacked discounts (e.g. 20% then 10%): After 1st = Original × (1 − 0.20) = Original × 0.80 After 2nd = After 1st × (1 − 0.10) Effective % = 100 − (0.80 × 0.90 × 100) = 28% Note: 20% + 10% ≠ 30% when stacked!

Stacked Discounts

When two discounts are applied sequentially — for example a 20% sale plus an extra 10% off — the combined discount is NOT simply 30%. The second discount is applied to the already-reduced price. Use the optional second discount field to see the true effective combined discount.

Finding the Original Price

If an item is on sale for £80 and you know it has a 20% discount, the original price is NOT £80 + 20% = £96. The correct calculation divides by (1 − 0.20) = £80 / 0.80 = £100. This calculator handles this correctly in "Original Price" mode.

Disclaimer: CalcHub calculators are for informational purposes only. Always verify prices with the retailer. Advertised discounts may be subject to terms and conditions.

// Stacked ≠ Added

20% off then 10% off = 28% total — not 30%. Stacked discounts always give less than the sum of individual discounts.

// Original Price Trap

To find the original from a sale price, divide by (1 − discount). Don't add the % back — that gives the wrong answer.

// Biggest Bang

Apply the largest discount first — it saves slightly more in absolute terms because it applies to the highest starting price.

// Price Anchoring

Retailers often inflate "original" prices to make discounts look bigger. Compare the sale price to other retailers, not just the crossed-out price.