Finance
Sales Tax Calculator | Calculate Tax Amount & Total Price
Calculate sales tax, the tax amount, and the total price after tax using any pre-tax purchase price, sales tax rate, and preferred currency.
Sales Tax Calculator
Enter a price before tax, select a currency, and enter a sales tax rate to calculate the tax amount and total price after tax.
Selecting a currency changes the currency label, symbol, and number formatting. It does not convert the entered amount using an exchange rate.
Total price after tax
$108.00
Includes $8.00 in sales tax at a rate of 8.00%. Values are shown in USD.
Base price
$100.00
Price before sales tax in USD
Sales tax
$8.00
Calculated at 8.00%
Total price
$108.00
Final price after tax in USD
Tax rate
8.00%
Sales tax percentage
This result is an estimate. Actual tax may differ because of location-specific rates, exemptions, product categories, tax holidays, and rounding rules.
Sales tax price breakdown
Compare the original purchase price with the additional sales tax amount.
Save and export multiple sales tax results
Save calculations for different purchases, currencies, invoices, or estimates. Select the results you need and export them as CSV or TXT files.
Page guide
On this page
Jump to the sales tax formula, worked example, common tax rate table, limitations, or FAQ.
How it works
Calculation overview
Sales tax formula
Tax and total formulas
What is it?
Purpose and uses
How to calculate
Step-by-step method
Worked example
Dynamic calculation
Tax rate table
Common percentages
Tax vs total
Understand the difference
Limitations
Rates and exemptions
Why use it?
Shopping and business
About this calculator
Purpose and accuracy
Sales tax FAQ
Common questions
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How this sales tax calculator works
This sales tax calculator multiplies the price before tax by the entered sales tax percentage to calculate the tax amount. It then adds that tax amount to the original price to calculate the total price after tax.
The selected currency controls the currency code, symbol, and number formatting shown throughout the calculator. It does not convert the entered amount using an exchange rate.
The calculator updates automatically whenever you change the purchase price, currency, or tax rate. It also displays a price breakdown, a worked example, and a comparison table using several common sales tax percentages.
You can share or download the current result, save multiple calculations locally, and export selected records for budgeting, shopping, invoice checks, or business estimates.
Sales tax formula and total price formula
Convert the percentage rate
Decimal tax rate = Sales tax percentage ÷ 100
Calculate the sales tax
Tax amount = Price before tax × (Tax rate ÷ 100)
Calculate the final price
Total price = Price before tax + Tax amount
For example, an 8% tax rate is converted to 0.08 before it is multiplied by the price. The resulting tax amount is then added to the original purchase price.
What is a sales tax calculator?
A sales tax calculator is an online tool that estimates the tax added to a product, service, invoice, or other taxable purchase. It shows both the separate tax amount and the final price after tax.
Instead of manually converting a percentage and completing several calculations, you can enter the pre-tax price, choose the applicable currency, and enter the sales tax rate to receive an immediate result.
This can make it easier to compare prices, prepare a purchase budget, check a receipt, estimate invoice totals, or understand how much additional tax will be charged at checkout.
How to calculate sales tax step by step
First, identify the price before tax and the applicable sales tax percentage. Divide the percentage by 100 to convert it into decimal form. For example, 8% becomes 0.08.
Multiply the price before tax by the decimal tax rate. This produces the sales tax amount. Finally, add the tax amount to the original price to find the total purchase price after tax.
Quick calculation
Tax amount = Price × (Rate ÷ 100)
Total price = Price + Tax amount
Sales tax example calculation
Using the values currently entered above, the price before tax is $100.00 and the sales tax rate is 8.00%.
Worked example
Tax amount = $100.00 × (8.00% ÷ 100)
Tax amount = $8.00
Total price = $100.00 + $8.00
Total price = $108.00
Sales tax table for common tax rates
This sales tax table compares the estimated tax amount and total price for a pre-tax price of $100.00 across several sample tax percentages.
| Tax rate | Tax amount | Total price after tax |
|---|---|---|
| 0.00% | $0.00 | $100.00 |
| 4.00% | $4.00 | $104.00 |
| 5.00% | $5.00 | $105.00 |
| 6.00% | $6.00 | $106.00 |
| 7.00% | $7.00 | $107.00 |
| 8.00% | $8.00 | $108.00 |
| 8.25% | $8.25 | $108.25 |
| 9.00% | $9.00 | $109.00 |
| 10.00% | $10.00 | $110.00 |
These rates are provided for comparison only. Enter the actual combined tax rate that applies to your purchase location and product category.
Sales tax amount vs total price after tax
The sales tax amount is only the additional charge calculated from the tax percentage. It does not include the original price of the item or service.
The total price after tax combines the original pre-tax price and the sales tax amount. For example, a 100-unit purchase with an 8% sales tax has an 8-unit tax amount and a final total price of 108 units in the selected currency.
Distinguishing between these two figures is useful when checking receipts, preparing invoices, estimating expenses, or recording tax separately in financial records.
Sales tax rates, exemptions, and calculator limitations
Sales tax rules vary by country, state, province, county, city, municipality, and product category. A location may combine several rates into one effective sales tax percentage.
Some goods and services may be exempt, taxed at a reduced rate, or subject to additional taxes. Tax holidays, business exemptions, resale certificates, and rounding rules can also affect the amount charged.
The currency selector does not convert values between currencies. It only changes the currency code, symbol, and formatting used for the entered amount and calculated results.
This calculator applies the percentage you enter and should be used as an estimate. For an official invoice, tax return, or legal calculation, verify the correct rate and rules with the relevant tax authority or a qualified professional.
Why use a sales tax calculator?
A sales tax calculator can help shoppers understand the real cost of a purchase before reaching checkout. This is especially useful when tax is not included in the displayed price.
Businesses and freelancers can also use the calculator to prepare estimates, review invoices, compare taxable totals, or communicate expected costs to customers in different currencies.
Saving multiple results makes it easier to compare purchases, test different tax rates and currencies, and export a record of calculations for later reference.
About this sales tax calculator
This free sales tax calculator was created for educational, budgeting, shopping, and general estimation purposes. It calculates the tax amount and total price using the standard percentage-based sales tax formula.
Calculator Tools provides free online calculators, converters, and measurement tools designed to deliver clear results, helpful explanations, and practical saving and export features.
Sales tax calculator FAQ
How do you calculate sales tax?
Divide the sales tax percentage by 100 and multiply it by the price before tax. Add the tax amount to the original price to calculate the total price after tax.
What is the formula for sales tax?
The formula is Tax amount = Price before tax × (Sales tax rate ÷ 100). The final total is Total price = Price before tax + Tax amount.
How do I calculate the total price after tax?
Calculate the tax amount and add it to the original price. For example, a 100-unit purchase with an 8% tax rate has 8 units in tax and a total price of 108 units.
Does choosing a currency convert the price?
No. The currency selector changes the currency code, symbol, and number formatting only. It does not convert the entered value using an exchange rate.
Is sales tax included in the listed price?
It depends on the country or region. In many locations, products are displayed at a pre-tax price and sales tax is added during checkout.
Can local sales taxes change the result?
Yes. State, county, municipal, regional, and special district taxes may be combined, so the final rate can vary by purchase location.
Can I use this calculator for VAT?
The basic percentage calculation is similar, but VAT rules, tax-inclusive prices, exemptions, and reporting requirements differ by country. This tool is primarily designed for sales tax added to a pre-tax price.
Are my saved sales tax results uploaded?
Saved results and calculation notes are stored locally in your browser on the current device. They may be removed if you clear your browser storage.
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