Calculate final sale prices, exact savings, original prices, stacked coupons, or batch cart totals instantly with live waterfall steps and tax estimates.
Note: Stacked discounts apply sequentially to each resulting subtotal, not simply added together.
| Offer | Rule | Savings | Final Price | Effective % |
|---|
Browser-local calculation: Calculations run in your browser. No pricing or shopping data is transmitted or stored.
Pricing advice: Compare the final checkout price, not only the advertised discount percentage. Actual tax, coupon stackability, and shipping terms depend on retailer policy.
| Discount % | Total Saved | Final Sale Price | Effective Rate |
|---|
Understanding the mathematics of discounts ensures you accurately evaluate promotions, verify retail claims, calculate sales tax impact, and determine exact cash savings.
Percentage markdowns reduce the original price proportionally. A 20% discount on a ₹1,000 item saves ₹200, resulting in a ₹800 final price.
When multiple discounts apply successively (e.g., 30% sale + 10% coupon), the second discount applies to the already discounted price, yielding an effective 37% discount, not 40%.
In standard commercial pricing, sales tax or GST is calculated on the net discounted subtotal, ensuring you only pay tax on what you actually spend.
Shows the step-by-step price reduction across sequential discount tiers:
\text{Discount} = \text{Original Price} \times \left(\frac{\text{Discount \%}}{100}\right)
\text{Final Price} = \text{Original Price} - \text{Discount Amount}
\text{Original Price} = \frac{\text{Sale Price}}{1 - (\text{Discount \%} / 100)}
\text{Final Price} = \text{Original} \times \prod_{i=1}^{n} \left(1 - \frac{d_i}{100}\right)
To calculate the final sale price, multiply the original price by the discount percentage divided by 100 to determine total savings, then subtract that amount from the original price. For example, a 25% discount on ₹1,200 saves ₹300, giving a final checkout price of ₹900.
Stacked discounts do not simply add together. If a store offers 30% off with an additional 10% coupon, the 10% applies to the remaining 70% subtotal, giving an effective savings of 37%, not 40%. The formula is Final = Original × (1 - d1) × (1 - d2).
When you know the discounted price and the discount rate, divide the sale price by (1 - Discount Rate / 100). For example, if an item costs ₹750 after a 25% discount, the original price is ₹750 / (1 - 0.25) = ₹750 / 0.75 = ₹1,000.
When combining percentage discounts (e.g., 20% off) and fixed amount vouchers (e.g., ₹300 off), the order of application matters. Applying percentage off first reduces the base before subtracting the coupon, which typically matches standard e-commerce checkout behavior.
In standard retail and commercial transactions, sales tax or GST is calculated on the net post-discount subtotal. If a ₹2,000 product is discounted by 20% to ₹1,600, an 18% GST rate is applied to ₹1,600 (₹288 tax), making the final payable amount ₹1,888.
A higher discount percentage does not always mean a better deal. A 50% discount on a ₹100 accessory saves ₹50, while a 15% discount on a ₹20,000 laptop saves ₹3,000. Always evaluate total cash savings and the final payable amount.
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