Calculator Inputs
Example Data Table
Use these sample values to verify your store math before entering live campaign numbers.
| Original Price | Quantity | Discount | Coupon | Shipping | Tax Rate | Unit Cost | Grand Total |
|---|---|---|---|---|---|---|---|
| $120.00 | 3 | 15% | 5% after discount | $12.00 | 8% | $55.00 | $325.96 |
| $85.00 | 2 | $10.00 fixed | None | $6.00 | 5% | $34.00 | $174.30 |
| $49.99 | 5 | 20% | $15.00 fixed | $10.00 | 7% | $18.50 | $208.61 |
Formula Used
Subtotal = Original Price × Quantity
Primary Discount = Subtotal × Discount Rate ÷ 100, or the fixed discount amount entered.
Price After Primary Discount = Subtotal − Primary Discount
Coupon Amount = Coupon Base × Coupon Rate ÷ 100, or the fixed coupon amount entered.
Discounted Subtotal = Price After Primary Discount − Coupon Amount
Tax Amount = Tax Base × Tax Rate ÷ 100
Grand Total = Discounted Subtotal + Shipping + Tax Amount
Gross Profit = Discounted Subtotal − (Unit Cost × Quantity)
Gross Margin Rate = Gross Profit ÷ Discounted Subtotal × 100
Effective Discount Rate = Total Savings ÷ Subtotal × 100
The calculator caps percentage discounts at 100% and prevents totals from dropping below zero.
How to Use This Calculator
- Enter the original item price and the number of units in the order.
- Choose whether your main promotion is percentage based or a fixed amount.
- Add an optional coupon and decide whether it should apply before or after the main discount.
- Set shipping, tax rate, tax base, and whether shipping is taxable.
- Enter unit cost if you also want profit and gross margin estimates.
- Click Calculate Discounted Price to show results above the form under the header.
- Use the CSV or PDF buttons to save a shareable report.
- Compare scenarios by changing one pricing variable at a time.
FAQs
1. What does the discounted subtotal represent?
It shows the order value after the main discount and coupon are applied, but before shipping and tax are added. This figure is useful for comparing promotional strategies and estimating revenue from the items alone.
2. Can I use both a sale discount and a coupon?
Yes. The calculator supports stacked promotions. You can enter a primary discount and then apply a coupon either to the original subtotal or to the already discounted subtotal, depending on your store rule.
3. Why is the tax amount changing when I switch tax base?
Different regions tax orders differently. Some stores tax the pre-discount amount, while others tax the discounted selling price. Changing the tax base lets you model those policies more accurately before launching a promotion.
4. What is the effective discount rate?
It measures the combined savings from all discounts and coupons compared with the original subtotal. This helps you understand the real promotional depth instead of looking at only one discount field.
5. How is gross profit calculated here?
Gross profit equals discounted subtotal minus total product cost. Tax is excluded from profit because it is usually collected for remittance. This keeps the margin view closer to operational ecommerce pricing analysis.
6. Does the calculator prevent impossible values?
Yes. It stops discount and coupon calculations from pushing the discounted subtotal below zero. Percentage values are capped at one hundred percent, and basic negative input validation is also included.
7. When should I include shipping in tax?
Enable that option only if your tax rules require shipping charges to be taxable. If shipping is non-taxable in your market, leave it unchecked so the final total mirrors your checkout setup.
8. What does break-even discount ceiling mean?
It estimates the highest percentage discount you can offer before item revenue drops to product cost. It is a quick guardrail for promotions when margin protection matters more than volume.