Sales Tax Calculator
A sales tax calculator shows how much tax is added to a taxable purchase and the final amount due. It is useful for budgeting purchases when you already know the combined state and local sales tax rate.
Quick answer
Multiply the taxable price by the sales tax rate to estimate tax, then add that tax to the price. Local rates and taxable items vary, so use the rate that applies to the transaction.
Calculator
How to use this calculator
- Enter the taxable purchase price.
- Enter the combined state and local tax rate.
- Review the tax amount and total purchase price.
Explanation
What it is
A sales tax calculator shows how much tax is added to a taxable purchase and the final amount due. It is useful for budgeting purchases when you already know the combined state and local sales tax rate.
How it works
The calculator converts the percentage rate to a decimal, multiplies it by the taxable price, and adds the result to the original price.
When to use it
Use the sales tax calculator when comparing options, setting a realistic target, or checking whether a proposed financial decision fits your broader plan.
Limitations
- The result is an estimate based on the amounts, rates, timing, and assumptions entered.
- Actual product terms, taxes, fees, eligibility rules, and market conditions can change the outcome.
- Use official disclosures or a qualified professional before making a binding financial decision.
Key terms
- Taxable price
- The portion of a purchase subject to sales tax.
- Combined rate
- The state, county, city, and district rates added together.
- Sales tax
- A transaction tax collected on taxable goods or services.
- Tax-inclusive total
- The amount paid after estimated tax is added.
Formula
The calculator converts the percentage rate to a decimal, multiplies it by the taxable price, and adds the result to the original price.
Worked example
For a $100 taxable purchase at 7.25%, estimated sales tax is $7.25 and the total is $107.25.
FAQ
How do I calculate sales tax on a purchase?
Multiply the taxable price by the tax rate expressed as a decimal. For a 7% rate, multiply by 0.07, then add the result to the price.
Why is the sales tax rate different by city?
State and local governments may impose separate rates, so the combined rate can vary by address and transaction location.
Are all products subject to sales tax?
No. Exemptions and reduced rates vary by state and product type, including food, medicine, clothing, and services.
Does this calculator find my local tax rate?
No. It calculates from the rate you enter. Confirm the applicable rate with the state or local revenue authority.
Can I calculate the pre-tax price from a tax-inclusive total?
This version starts with a pre-tax price. Divide an inclusive total by 1 plus the tax rate as a decimal to estimate the pre-tax amount.
Common mistakes
- Using an advertised rate without checking whether it applies to the full balance or term.
- Leaving out fees, taxes, timing differences, or irregular cash flows.
- Treating a planning estimate as a guaranteed quote or final professional calculation.
Tips
- Run a conservative scenario as well as an optimistic one.
- Change one assumption at a time so you can see what drives the result.
- Save or export the calculation and update it when rates, costs, or goals change.
Sources and editorial review
Educational estimates only; not personalized financial, tax, legal, lending, investment, or insurance advice.