A sales tax calculation has two useful answers: the amount of tax added to a price and the final amount the customer pays. This calculator helps you work out both values from the original price and the applicable tax rate.
Quick Answer
Sales Tax = Price Γ (Tax Rate Γ· 100)
Total Price = Price + Sales Tax
Understanding the Inputs
Price is the amount before sales tax. Tax rate is the percentage charged by the applicable tax authority. For example, a 7.5% rate is entered as 7.5, not 0.075.
How to Use the Sales Tax Calculator
- Enter the original price before tax.
- Enter the sales tax rate as a percentage.
- Calculate the result to see the tax amount.
- Add the tax to the original price to get the final total.
Worked Examples
Example 1: $100 at 8%
Tax = $100 Γ 8 Γ· 100 = $8. Total = $100 + $8 = $108.
Example 2: $250 at 6.5%
Tax = $250 Γ 6.5 Γ· 100 = $16.25. Total = $266.25.
Example 3: $79.99 at 7.25%
Tax = $79.99 Γ 7.25 Γ· 100 = $5.80 when rounded to cents. The total is about $85.79.
Sales Tax Examples
| Price | Rate | Tax | Total |
|---|---|---|---|
| $50 | 5% | $2.50 | $52.50 |
| $100 | 8% | $8.00 | $108.00 |
| $500 | 7.5% | $37.50 | $537.50 |
Tax Rate as a Decimal
The same calculation can be written as Tax = Price Γ Tax Rate when the rate is expressed as a decimal. Thus, 8% becomes 0.08. Keeping the percentage and decimal formats separate helps prevent accidentally multiplying by 8 instead of 0.08.
Common Mistakes
- Adding the percentage directly to the price without calculating the tax amount.
- Entering 8 instead of 0.08 when a calculator asks for a decimal rate.
- Rounding too early in a multi-item calculation.
- Assuming the same sales tax treatment applies to every product or location.
Important
This calculator is provided for general educational and informational purposes and is not financial, tax, or legal advice. Actual tax treatment can depend on the product, location, exemptions, and applicable rules. Verify the rate and tax treatment with the relevant authority or a qualified professional.