Sales Tax Calculator
Calculate sales tax for any purchase amount. Add tax to a price, remove tax from a total, or find the tax rate. Includes US state tax rates.
Formula:Total = Price × (1 + Tax Rate)
Tax Calculation
Total with Tax
$108
Sales Tax
$8
8.25% rate
Original Price$100
Tax Amount$8
Total$108
Effective Tax Rate8.250%
Calculation Mode
Price Before Tax
11,000
Tax Rate
%
%
Combined Tax Rate8.250%
Quick Reference (8.25% rate)
| Price | Tax | Total |
|---|---|---|
| $25 | $2 | $27 |
| $50 | $4 | $54 |
| $100 | $8 | $108 |
| $500 | $41 | $541 |
| $1,000 | $83 | $1,083 |
States with No Sales Tax
Alaska
0% tax
Delaware
0% tax
Montana
0% tax
New Hampshire
0% tax
Oregon
0% tax
Note: Alaska has no state sales tax but allows local municipalities to charge sales tax.
Highest Combined Sales Tax Rates (State + Avg Local)
Louisiana9.55%
Tennessee9.55%
Arkansas9.46%
Washington9.29%
Alabama9.24%
Combined rates include average local taxes. Actual rates vary by city/county.
Sales Tax Formulas
Add Tax to Price
Total = Price × (1 + Tax Rate)
Example: $100 × 1.08 = $108
Remove Tax from Total
Original Price = Total ÷ (1 + Tax Rate)
Example: $108 ÷ 1.08 = $100
Find Tax Rate
Tax Rate = (Total - Original) ÷ Original × 100
Example: ($108 - $100) ÷ $100 × 100 = 8%
Tax Calculation
Total with Tax
$108
Sales Tax
$8
8.25% rate
Original Price$100
Tax Amount$8
Total$108
Effective Tax Rate8.250%
Adjust Tax Rate
Compare how different tax rates affect your purchase total
0%8.25%12%
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Frequently Asked Questions
To calculate sales tax, multiply the price by the tax rate as a decimal. For example: $100 × 0.08 (8%) = $8 sales tax. Total = $108. To find the original price from a total including tax: divide total by (1 + tax rate). $108 ÷ 1.08 = $100.
The average combined state and local sales tax in the US is about 7.12%. However, rates vary significantly: some states have no sales tax (Alaska, Delaware, Montana, New Hampshire, Oregon), while others like Tennessee and Louisiana have combined rates over 9%.
Common exemptions include: groceries (most states), prescription medications, medical equipment, some clothing (varies by state), and items for resale. Each state has different rules. Some have tax holidays for back-to-school items or emergency supplies.
Sales tax is collected only at final sale to consumers. VAT (Value Added Tax) is collected at each stage of production/distribution. VAT is common outside the US and is typically already included in displayed prices, while US sales tax is added at checkout.
Yes, since the 2018 Supreme Court ruling (South Dakota v. Wayfair), states can require online retailers to collect sales tax even without physical presence. Most major retailers now collect tax based on shipping address. You may owe "use tax" on untaxed purchases.
To reverse-calculate the pre-tax price from a total that includes tax: divide the total by (1 + tax rate as decimal). Example: Total $108 with 8% tax → $108 ÷ 1.08 = $100 original price. The tax was $8.
How this works
Calculations are run entirely in your browser. No inputs are sent to our servers and no account is required. Formulas follow standard US definitions from the IRS and the CFPB where applicable; international users should confirm local tax and regulatory rules apply.
What this tool can’t do
When to consult a professional
This is a software engineering tool, not financial advice. Run the math here, then take the result to a certified financial planner, CPA, or your bank before making a decision that materially affects your money.
Sources
- [1]Consumer Financial Protection Bureau (CFPB)Official sourceconsumerfinance.govAccessed Apr 21, 2026
US consumer finance regulator; authoritative on mortgage disclosures, APR rules, credit cards.
Joseph OrdunaFounder & Software Engineer
Full-stack software engineer specializing in embedded systems, web architecture, and AI/ML. Founder of Practical Web Tools. Built the gesture-controlled drone IP acquired by KD Interactive (Aura Drone, sold on Amazon).
Tax Calculation
Total with Tax
$108
Sales Tax
$8
8.25% rate
Original Price$100
Tax Amount$8
Total$108
Effective Tax Rate8.250%