How the calculator works
- Product price
- The listed price of the product before any reduction.
- Discount percentage
- Optional. A percentage taken off the product price first.
- Coupon amount
- Optional. A flat amount taken off the discounted price. It is limited so the subtotal never goes below zero.
- Tax percentage
- Optional. An estimate you enter yourself, applied to the subtotal after discount and coupon.
- Shipping cost
- Optional. Added after tax. This estimate does not tax shipping.
The order of operations
- 1. Price after discount = Product price − (Product price × Discount % ÷ 100)
- 2. Subtotal = Price after discount − Coupon (never below zero)
- 3. Estimated tax = Subtotal × Tax % ÷ 100
- 4. Estimated final cost = Subtotal + Estimated tax + Shipping
- Total savings = Discount amount + Coupon applied
Worked example
Example (hypothetical numbers, not a real listing): suppose a product costs ₹10,000 with 10% off, a ₹500 coupon, ₹100 shipping and 5% tax.
- Price after discount: 10,000 − 1,000 = ₹9,000.
- Subtotal after the coupon: 9,000 − 500 = ₹8,500.
- Estimated tax: 8,500 × 5% = ₹425.
- Estimated final cost: 8,500 + 425 + 100 = ₹9,025. Total savings: ₹1,500.
Shipping and tax pushed the cost back up by ₹525, so the ₹1,500 saved shows up as ₹975 less than the original price once those are added.
When to use it
- You want the total you may pay, not just the listed price, before you decide to buy.
- You are comparing two offers that differ in shipping, coupons or discounts.
- You want to work out a budget for a purchase and see the savings separately from the extra costs.
An estimate, not a checkout
This is an estimated shopping cost based on the values you enter. Real checkouts can handle tax, fees, bank offers and shipping differently depending on the store and region, so the final amount may not match.
The calculator is not a tax or legal calculator. Use the tax field for a rough percentage you already know, and check the checkout page for the actual total.
Common mistakes
- Assuming every store calculates tax in the same order. Some prices already include tax, in which case you should leave the tax field empty.
- Counting shipping or tax as savings. Only the discount and the coupon reduce the price.
- Entering both a percentage discount and the same reduction as a coupon, which counts it twice.
- Comparing the final cost of two products without checking they are the same variant and seller.
Using the result with price tracking
Once you know the total you are willing to pay, track the product and watch for a better price. The calculator gives you a number to aim for; tracking tells you when the listed price moves.