MiniCalci

Calculators & Converters
Everyday Math

Discount Calculator

Free discount calculator for sale price, amount saved, percent-off or flat-amount discounts, and stacked (sequential) discounts with the true effective discount rate.

What Does This Discount Calculator Do?

This discount calculator finds the sale price and amount saved on an item, supporting both percentage-off and flat dollar-off discounts. It also supports stacking two discounts applied sequentially - for example, an extra 10% off an already-discounted item - and shows you the true, combined effective discount percentage.

The Discount Formula

For a single percentage discount:

Sale Price = Original Price × (1 - Discount% / 100)

For a single flat-amount discount:

Sale Price = Original Price - Discount Amount

How Stacked Discounts Actually Work

When two discounts apply, the second discount is calculated on the price after the first discount - not on the original price, and not simply added to the first percentage. This is a common source of confusion: 20% off plus an additional 10% off does not equal 30% off.

Worked Example

A 100.00 item has 20% off, then an additional 10% off the discounted price:

  • Price after 1st discount = 100.00 x (1 - 20/100) = 100.00 x 0.80 = 80.00
  • Price after 2nd discount = 80.00 x (1 - 10/100) = 80.00 x 0.90 = 72.00
  • Total amount saved = 100.00 - 72.00 = 28.00
  • Effective discount = 28.00 / 100.00 = 28% (not 30%)

This calculator performs exactly this sequential math for you and clearly labels the "effective discount" so you're never surprised at checkout.

Percent Off vs. Dollar Off

A percentage discount scales with price, so it's worth more on expensive items (20% off a 500 item saves 100, while 20% off a 20 item saves only 4). A flat dollar discount removes a fixed amount regardless of price, so it's proportionally more valuable on cheaper items (10 off a 20 item is a 50% effective discount, while 10 off a 500 item is only 2%). Toggle between the two discount types to compare which offer is actually better for your specific purchase.

Practical Tips

  • Order matters for flat + percent combos: Applying a flat discount before a percentage discount can produce a different result than the reverse order - use the toggles to test both.
  • Watch for "up to X% off": Store promotions advertising "up to 50% off" often mean only select items hit that ceiling - check the actual discount applied to your specific item.
  • Coupon stacking limits: Many retailers cap how many discounts can combine - always check the fine print before assuming two codes will stack.
  • Compare the effective discount, not just the advertised numbers: The effective discount percentage this calculator shows is the only number that reflects your true, combined savings.

Frequently Asked Questions

How does a stacking discounts calculator work?
Stacked discounts are applied one after another, not added together. This calculator applies the first discount to the original price, then applies the second discount to the already-discounted price. Enable 'Stack a second discount' to see the price after each step and the combined effective discount percentage.
How much do I save with two discounts?
It depends on the order and type of discounts, but two stacked percentage discounts always save less than simply adding the percentages. For example, 20% off then 10% off a 100 item leaves you paying 72.00 (a 28% effective discount), not 30% off as you might expect from adding 20 + 10.
What's the difference between percent off and dollar off discounts?
A percent-off discount (e.g. 20% off) scales with the price - larger for expensive items, smaller for cheap ones. A flat dollar-off discount (e.g. 10 off) removes the same amount regardless of price, so it's proportionally more valuable on cheaper items. This calculator lets you toggle between both types for either discount.
Why isn't 20% off plus 10% off the same as 30% off?
Because the second discount applies to the already-reduced price, not the original price. 100 with 20% off becomes 80.00. Taking 10% off that 80.00 removes only 8.00 (not 10.00), leaving 72.00 - a 28% effective discount, not 30%.
How do I calculate the sale price after a discount?
For a percentage discount: Sale Price = Original Price x (1 - Discount% / 100). For a flat discount: Sale Price = Original Price - Discount Amount. This calculator does both and, for stacked discounts, applies the second discount to the result of the first.
What is the effective discount percentage?
The effective discount percentage is the total percentage saved off the original price, calculated as (Total Amount Saved / Original Price) x 100. It accounts for the true combined effect of any stacked discounts, which is usually lower than simply adding the individual percentages together.
Can I combine a percentage discount with a flat dollar discount?
Yes. Set the first discount to one type (e.g. percent) and the second to the other type (e.g. flat amount) - the calculator applies them sequentially in the order you entered them, whichever types you choose.

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How this is calculated: This tool uses standard, well-established formulas for everyday math calculations. Results are estimates for informational and planning purposes — always double-check figures for anything with real-world consequences (e.g. ordering materials or submitting grades).