1
Choose add-tax or reverse-tax mode
Use add-tax mode when you know the pre-tax price. Use reverse-tax mode when a receipt or checkout total already includes tax.
Pricing
Free sales tax calculator
A sales tax calculator estimates the tax on a taxable purchase, the final checkout price, or the pre-tax amount hidden inside a tax-inclusive total.
Add taxReverse taxCheckout totalTaxable shipping
Need a marketplace for your app, not just a calculator? Explore Vibe Mart.
Calculate sales tax
Switch modes, add order adjustments, and see the sales tax estimate update instantly.
Sales tax formulas
These formulas power the calculator for add-tax and reverse-tax estimates.
Sales tax = Taxable subtotal x Tax rate
Final total = Taxable subtotal + Sales tax + nontaxable charges
Reverse pre-tax price = Tax-inclusive total / (1 + Tax rate)
Effective tax rate = Sales tax / Final total
How to use this sales tax calculator
2
Enter the tax rate
Add the combined state, county, city, and special-district sales tax rate for the sale.
3
Add price details
Enter item price, quantity, discounts, shipping, handling, and nontaxable amounts so the taxable subtotal is closer to the actual order.
4
Review tax and final price
Use the results to see sales tax, effective rate, final total, and the share of the checkout total that comes from tax.
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Sales tax FAQ
Common questions about calculating sales tax, reverse tax, shipping taxability, and ecommerce order estimates.
What is a sales tax calculator?
A sales tax calculator estimates the tax charged on a taxable purchase and shows the final price after tax. It can also reverse a tax-inclusive price to estimate the original pre-tax amount and tax portion.
How do you calculate sales tax from a price?
Multiply the taxable subtotal by the sales tax rate. For example, a $100 taxable subtotal at 8% sales tax creates $8 in tax and a $108 final price.
How do you reverse calculate sales tax?
Divide the tax-inclusive total by 1 plus the tax rate. For example, if the total is $108 and the tax rate is 8%, the pre-tax price is $108 / 1.08, or $100.
Is shipping taxable?
Shipping taxability depends on the state, product type, and how the charge is presented. Some states tax shipping when the item is taxable, while others do not. Use this calculator as an estimate and verify local rules for compliance.
Does this calculator file or remit sales tax?
No. This calculator only estimates sales tax and checkout totals. Sellers still need to confirm nexus, exemptions, marketplace rules, filing frequency, and remittance requirements for each jurisdiction.
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