What is a Double Discount?

A double discount applies two percentage reductions one after the other. The second discount is taken from the price after the first discount has already reduced it not from the original price. This makes the total saving smaller than the sum of the two percentages.

How to use this calculator

1. Enter the Original Pric.
2. Enter the First Discount (%)
3. Enter the Second Discount (%)
4. (Optional) Tick Include Sales Tax / GST and enter Tax Rate (%) to get the final amount including tax.
5. Click Calculate, you’ll see price after each discount, total savings, effective discount rate and (if chosen) tax added to the final price.

This tool accepts decimals and shows results rounded to two decimal places for currency clarity.

How it works

• Price after first discount = P1 = OriginalPrice × (1 − D1/100)
• Price after second discount = P2 = P1 × (1 − D2/100)
• Total savings = OriginalPrice − P2
• Effective (single equivalent) discount percentage = 100 × (1 − P2 / OriginalPrice)

You can also compute the equivalent single discount directly as:

EquivalentDiscount% = D1 + D2 − (D1 × D2) / 100

This gives the same final price as applying the two successive discounts and is useful for quick mental checks.

Example

Original price = $200, First discount = 20%, Second discount = 10%:

1. After 20%: $200 × 0.80 = $160.
2. After 10% on $160: $160 × 0.90 = $144.
3. Total saved = $200 − $144 = $56 → Effective discount = (56/200)×100 = 28%.
   Compare: 20 + 10 − (20×10)/100 = 30 − 2 = 28% — matches the computed result.

Why this matters

• Avoid over-estimating savings: People often add discount percentages; this calculator gives the actual amount you’ll pay.
• Stacking coupons & promotions: See the real effect of combining store markdowns, coupons, or membership discounts.
• Price comparisons: Quickly compute whether stacking a second discount beats a competitor’s single discount after tax.
• Retail and business use: Useful for merchants testing promotional strategies or for shoppers negotiating in marketplaces.

Tips & best practices

• When tax is included, remember tax is usually applied after discounts in many U.S. states check local rules if in doubt.
• If you’re comparing offers, convert every offer into a final dollar price (not just percentages) that avoids confusion.
• For multi-item purchases, apply discounts per item if discounts are item-level; for overall cart discounts, calculate on the cart total.
• Looking for a simple single-discount calculation instead? Try our Discount Calculator for quick one-discount price savings.

what each input means

• Original Price: The product’s listed price before any discounts (enter in your currency).
• First Discount (%): The first percentage reduction (applied to the original price).
• Second Discount (%): The second percentage reduction (applied to the price after the first discount).
• Include Sales Tax / GST (checkbox): Toggle this to add a final tax calculation on the discounted price.
• Tax Rate (%): Enter your local sales tax percentage (only used when the checkbox is checked).

FAQ

Q1. Is a 50% + 50% discount the same as 100% off?

A: No, two successive 50% discounts result in 75% off the original price (50% of 50% remains), not free. The formula shows why.

Q2. Where is tax applied before or after discounts?

A: Most retailers apply tax after discounts, but local regulations vary. Use the calculator’s tax toggle for an accurate final price.