Calculators
Sales Tax Calculator
Find sales tax, final price, pre-tax price, or tax rate.
Sales Tax Calculator tool
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About This Tool
Use the sales tax calculator for checkout estimates, receipt checks, invoices, and reverse-tax arithmetic. Choose whether you know the pre-tax price and rate, the tax-included total and rate, or the pre-tax and final amounts. The calculator reports the tax amount, final price, pre-tax price, and effective rate from the numbers you enter, but it does not look up local tax law, exemptions, product categories, nexus rules, or filing requirements.
How To Use It
- Choose the calculation mode that matches the amounts you know: add tax, remove tax from an included total, or derive the effective rate.
- Enter the price, total, or tax rate requested by the labels. Use the rate that applies to the purchase, receipt, or invoice you are checking.
- Review the tax amount, pre-tax price, final price, and effective rate.
- Treat the result as arithmetic support only. Confirm official rates, exemptions, rounding, and reporting rules from the relevant tax authority or business system when they matter.
Examples
8.25% sales tax on 120
Enter 120 as the pre-tax price and 8.25 as the tax rate. The tax is 9.90 and the final price is 129.90.
Reverse tax from a 54.13 total
Enter 54.13 as the tax-included total and 8.25 as the rate to estimate the original pre-tax price and tax portion. The pre-tax amount is divided out of the tax-included total rather than subtracting 8.25% of the total.
Find an effective receipt rate
If a receipt shows 80.00 before tax and 86.60 after tax, choose the pre-tax and final price mode. The effective rate is 8.25%.
Zero-tax item
A 0% rate leaves the final price equal to the pre-tax price and reports a tax amount of zero, which can be useful for tax-exempt or non-taxed examples.
Useful Notes
Add sales tax
When you know the pre-tax price and rate, sales tax equals pre-tax price x rate / 100. Final price equals pre-tax price plus that tax amount.
Reverse sales tax
When the total already includes tax, the pre-tax price is total divided by 1 plus the tax rate as a decimal. For example, with an 8.25% rate, divide the included total by 1.0825 to separate the original price from the tax portion.
Effective tax rate
When you know the pre-tax and final prices, the effective rate is the difference divided by the pre-tax price, then multiplied by 100. This is useful for checking a receipt, but it may combine several local rates or reflect rounding.
Local estimate
Calculations run in your browser and do not look up city, county, state, provincial, product, exemption, marketplace, or invoice rules automatically. Enter the applicable rate yourself and verify authoritative rules for tax compliance.
Rounding and receipts
Stores and invoicing systems may round at the line-item level, invoice level, or jurisdiction level. A calculator result can differ by a cent from a receipt when the system rounds intermediate amounts differently.
Not tax advice
This tool performs percentage arithmetic only. It does not determine whether tax should be collected, remitted, refunded, or reported, and it should not be treated as accounting, legal, or tax advice.
FAQ
Does this know my local sales tax rate?
No. Enter the rate that applies to your purchase, receipt, or invoice. The calculator does not use location, product category, or tax authority data.
Can I remove tax from a total?
Yes. Choose the tax-included total mode and enter the total plus the tax rate.
How do I find the effective tax rate?
Choose the rate from pre-tax and final price mode. The calculator divides the tax difference by the pre-tax amount.
Why does my receipt differ by a cent?
Receipts can round each line, each tax jurisdiction, or the whole invoice differently. Small differences are common when several items or rates are involved.
Can this tell me whether an item is taxable?
No. Taxability depends on location, item type, buyer status, seller rules, and exemptions. Check the relevant authority or business records when that decision matters.