Sales Tax Calculator
Adding Tax Without the Mental Math
Sales tax rates vary block by block in some jurisdictions — state, county, and city rates stack on top of each other, and getting the final total wrong at checkout or on an invoice is an easy mistake to make by hand. This calculator applies a given rate to a price and returns both the tax owed and the total due, which is the number that actually needs to be collected or paid.
The Formula
Tax = Price × Rate
Total = Price + Tax
Total = Price + Tax
A Worked Example
| Item | Amount |
|---|---|
| Price | $1,200.00 |
| Sales Tax Rate | 7.25% |
| Tax | $87.00 |
| Total | $1,287.00 |
Where This Calculation Matters
- Point-of-sale accuracy — retail and service businesses need to apply the correct combined rate consistently across every transaction to avoid over- or under-collecting from customers.
- Invoice preparation — businesses invoicing across multiple jurisdictions often need to recalculate tax on each invoice using the rate that applies to the customer's location.
- Budgeting large purchases — for big-ticket items like vehicles or equipment, knowing the exact tax-inclusive total before committing avoids budget surprises at closing.
- Remittance reconciliation — comparing tax collected against tax calculated on total sales is a standard check before filing a sales tax return.
Note: Sales tax rates and rules vary significantly by state, county, and product category, and some jurisdictions exempt certain goods entirely. Confirm the applicable combined rate before using it for filing purposes.
How to Use This Calculator
- Enter the Price of the item or service before tax.
- Enter the Sales Tax Rate as a percentage.
- Select Calculate to see the tax amount and the total price including tax.
Related Calculations
See how payroll tax is calculated with the Payroll Tax Calculator, or check margins on the underlying sale with the Break-Even Point Calculator.