Sales Tax Calculator

What is a Sales Tax Calculator?

A sales tax calculator helps you quickly determine the tax amount and total price for any purchase. Whether you're shopping, budgeting, or running a business, this calculator makes it easy to compute sales tax at any rate. You can also use the reverse calculation to find the pre-tax price when you know the total amount paid.

How to Use This Calculator

1. Enter Price: Input the price before tax (or the total price for reverse calculation)
2. Set Tax Rate: Enter your local sales tax rate or use a preset button
3. View Results: See the tax amount and total price instantly
4. Reverse Calculate: Use the toggle to find the pre-tax price from a total

Understanding Your Results

Tax Amount

The amount of sales tax applied to your purchase. This is calculated by multiplying the price by the tax rate.

Total Price

The final amount you'll pay, including the original price plus sales tax.

Pre-Tax Price (Reverse)

When you know the total paid and want to find the original price before tax was added.

The Formula Behind the Calculation

Standard Calculation:

• Tax Amount = Price × (Tax Rate ÷ 100)
• Total = Price + Tax Amount

Reverse Calculation (Find Pre-Tax Price):

• Pre-Tax Price = Total ÷ (1 + Tax Rate ÷ 100)

Source: Standard sales tax computation used by retailers and tax authorities.

Common US State Sales Tax Rates

Note: Local taxes may add 1-5% to these base rates.

Frequently Asked Questions

How do I calculate sales tax?

Multiply the price by the tax rate (as a decimal). For example, $100 × 0.08 = $8 tax for an 8% rate.

How do I find the price before tax?

Divide the total by (1 + tax rate). For example, $108 ÷ 1.08 = $100 pre-tax price.

Why do tax rates vary?

Sales tax rates differ by state, county, and city. Some areas have no sales tax, while others combine state and local taxes for rates over 10%.

What items are taxed?

Most tangible goods are taxed. Many states exempt groceries, medicine, and clothing. Services may or may not be taxed depending on the state.

How accurate is this calculator?

This calculator uses standard formulas. For official business purposes, consult your local tax authority for the exact applicable rate.

Important Considerations

• Local Taxes: Many areas add local taxes on top of state rates
• Exemptions: Some items (groceries, medicine, clothing) may be exempt in certain states
• Combined Rates: Always check the total combined rate for your specific location

Disclaimer: This calculator provides estimates for informational purposes only. Tax rates change frequently. Consult your local tax authority for official rates and regulations.