🛍️ Sales Calculator
Quickly calculate total sales revenue, sales tax owed, and the final amount due for any transaction.
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What Does This Calculator Do?
This sales calculator works out the total amount due on a sale, including subtotal and sales tax, based on the unit price, quantity purchased, and the applicable tax rate.
The Formula
Subtotal = Unit Price × Quantity. Sales Tax = Subtotal × Tax Rate. Total Sale Amount = Subtotal + Sales Tax. Sales tax rates vary by state, county, and city, so use the actual combined rate that applies to your transaction for accurate results.
- Some jurisdictions exempt certain goods or services from sales tax entirely — check local rules if unsure.
- This calculator assumes a single flat tax rate applied to the full subtotal.
For general planning and educational purposes; consult local tax authorities for exact obligations.
Last reviewed August 2026