About Sales Tax Calculator
Calculate sales tax add-on or extract original pre-tax costs and tax paid directly from final cash register receipt totals.
Key Capabilities & Features
- Dual calculation modes: Forward (Price + Tax) and Reverse (Extract from Receipt Total)
- Quick presets for US state rates, Canadian GST/PST, and European VAT
- Computes exact pre-tax subtotal, tax portion, and gross total
- Full precision rounding to cents ($0.01)
How to Use Sales Tax Calculator
1
Choose Mode
Select Forward (to add tax) or Reverse (to extract tax from an existing receipt).
2
Enter Amount
Type the dollar amount from your price tag or receipt.
3
Specify Tax Rate
Select your local sales tax or VAT percentage.
Privacy & In-Browser Execution Guarantee
100% client-side calculation. Your receipt numbers never leave your browser.
Frequently Asked Questions
What is reverse sales tax calculation?
Reverse tax extraction divides the gross receipt total by (1 + tax_rate / 100) to mathematically determine what portion was the actual merchandise and what portion was tax.
Does this tool work for international VAT?
Yes, the mathematical extraction is identical for VAT, GST, HST, and standard US sales tax.