Percent Off Calculator
Calculate stacked discounts, tax, shipping & true final price
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Savings Breakdown
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📌 How Stacked Discounts Work
- 20% + 10% ≠ 30% - They apply sequentially, resulting in 28% total discount
- First Discount: P × (1 - 20%) = P × 0.8
- Second Discount: (P × 0.8) × (1 - 10%) = P × 0.72
- Tax applies to the discounted amount, not the original
- Shipping added at the very end (after tax)
📐 Discount Stacking Formula
F
=
P
×
(
1
−
d1
)
×
(
1
−
d2
)
×
(
1
+
t
)
+
s
F = final payable amount
P = original price
d₁,d₂ = discount rates (decimal)
t = tax rate (decimal)
s = shipping charge
Discounts are sequential (multiplicative), not additive.
❓ Percent Off Calculator FAQs
How does discount stacking really work?+
Each discount applies to the reduced price from the previous step. This makes the combined effective discount lower than simple addition.
Is tax calculated before or after discounts?+
In most cases, tax is applied after discounts on the taxable amount. This usually reduces total tax compared to taxing the original price.
When should shipping be added?+
Shipping is typically added near the end of checkout, after item discounts and often after tax calculations depending on platform and tax rules.
How should coupon codes be used for maximum savings?+
Try percentage coupons on higher base amounts and compare with flat coupons. Also verify whether coupons apply before or after existing sale discounts.