Business Tools

Free Discount Calculator

Whether you're building a promo, quoting a bulk deal or checking a supplier invoice, this calculator handles flat and percentage discounts on single items or full line-item lists — with optional tax on top.

Item

Saves $20.00 → $80.00

Results

Subtotal (original)$100.00
Amount saved− $20.00
After discount$80.00
Final price$80.00

What the Discount Calculator does

A discount is a reduction applied to a listed price, expressed either as a flat amount or a percentage, calculated before tax is added back on the reduced figure. This tool exists to apply that reduction accurately across single items or multi-line orders, not to measure profitability — pair it with the Profit Margin Calculator to see the cost of a promotion.

Methodology and formula

Percentage discount: Final Price = Original Price x (1 − Discount % / 100); Flat discount: Final Price = Original Price − Discount Amount; Tax is applied after the discount.

Worked example

Inputs
Original price 250; discount 20%; tax 8%.
Result
Discounted price 200; tax 16; total due 216; savings 50.

The customer saves $50 off the list price, and because tax is calculated on the discounted $200 rather than the original $250, they also pay $4 less tax than they would if tax were applied first — matching standard invoicing rules.

When to use this tool

Use this tool to work out the final price and savings for a promotion, bulk order or invoice line. Check the Profit Margin Calculator first to see how much margin room a discount actually leaves, and use the Markup Calculator if you need to rebuild a price from cost after deciding on a target margin.

About the Discount Calculator

How the discount is applied

Percentage discount: Final = Original × (1 − Discount / 100). Flat discount: Final = Original − Discount. If tax is entered, it's applied to the discounted price, not the original — matching standard invoicing behaviour.

Discounting without eroding margin

A 20% discount on a product with a 40% margin cuts profit by half. Before promising a discount, check your margin — the profit margin calculator on this site tells you exactly how much room you have.

Volume vs promotional discounts

Volume discounts are permanent tiered pricing tied to quantity — they belong in your price list. Promotional discounts are time-limited and should have an end date. Mixing them trains customers to always wait for a promo.

Frequently asked questions

Is the tax calculated before or after the discount?

After. The discount reduces the taxable amount, then tax is applied to the reduced price. This matches standard invoicing and most tax authorities.

Can I combine multiple discounts?

Use multi-item mode and apply the discount per line. Stacking two percentages on one line requires applying them sequentially, not adding them together.

What does 'buy one get one free' translate to?

A 50% discount on the total for two items — enter two lines at full price and 50% discount per line, or a single line with 50% off two units.

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