Everyday Tools

Sales Tax Calculator

Calculate sales tax on a purchase amount or work backward from a total that already includes tax.

Updated April 11, 2026
Free online tool
Planning and research use

Why this page exists

Sales tax is easy to overlook when you are comparing prices or trying to stay inside a budget. This calculator helps you add tax to a purchase quickly or reverse the math from a final total when you want to estimate the original pre-tax amount.

Interactive tool

Run the estimate

Enter your numbers and read the result first, then use the sections below to understand what affects the outcome.

Calculator

Sales tax calculator

Add sales tax to a purchase or work backward from a total that already includes tax.

Result

$162.36

Estimated total after sales tax based on the purchase amount and tax rate you entered.

Total with tax$162.36

Sales tax amount$12.37

Purchase amount$149.99

Tax rate used8.25%

A 8.25% sales tax adds about $12.37 to this purchase.
This is useful for comparing totals across locations or checking whether a purchase still fits the budget after tax.
If your area uses different rates for different items, rerun the estimate with the exact rate that applies.

Sales tax rules vary by location and item type. Use the rate that best matches the purchase you are estimating.

Planning note

Last updated April 11, 2026. Use this tool to compare scenarios and plan ahead, then confirm important details with the lender, employer, insurer, contractor, or other qualified provider involved in the final decision.

How it works

What the calculator is doing

Choose whether you want to add sales tax to a purchase amount or reverse tax from a total that already includes it.

Enter the amount and tax rate that match the purchase or receipt you are checking.

Use the result to see the tax amount, the total with tax, or the pre-tax amount depending on the mode you selected.

Understanding your result

Sales tax results are most useful when they answer the practical question in front of you: how much extra tax this purchase adds, or how much of a final total came from tax. That makes the number easier to use while shopping, budgeting, or checking receipts.

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Examples

Ways people use this tool

Example scenarios help turn a quick estimate into a more useful comparison or planning step.

Check whether a purchase still fits the budget after tax

Add sales tax to the listed price so you can compare the real total against the amount you planned to spend.

Work backward from a receipt total

Use reverse-tax mode when you know the final amount paid and want to estimate the original price before tax.

Compare totals across different tax rates

Run the same purchase with two tax rates to see how much location or item type changes the final total.

FAQ

Common questions

When should I use reverse-tax mode?

Use it when you already know the final total from a receipt or quoted price and want to estimate how much of that total came from the original purchase amount before tax.

Does this work for any sales tax rate?

Yes. You can enter the rate that matches the store, state, city, or item category you are estimating.

Can the final total still be different in real life?

Yes. Some purchases have special tax rules, extra local charges, or exemptions, so the result works best as a quick estimate.

Related tools

Keep comparing

Use these related tools to compare nearby scenarios, check a second estimate, or keep narrowing down the right decision.

Everyday ToolsUpdated April 11, 2026