SALES TAX CALCULATOR
$100.00 × 8.875% = $8.88 tax. Gross $108.88. Two-decimal rounding. Enter your local tax rate. Rates vary by state, city, and product type. This calculator does not look up rates by location.
Updated May 2026 · Built by Lukáš, an architect in Prague.
Formula, assumptions, rounding & limitations
Formula
- Add tax:
gross = net × (1 + rate ÷ 100) - Remove tax:
net = gross ÷ (1 + rate ÷ 100) tax amount = gross − net
Assumptions
- The rate you enter is the combined rate (state + county + city + any special district), expressed as a percentage.
- The same rate applies to the entire price — no per-line mix.
- Both decimal comma (8,875) and decimal point (8.875) are accepted.
Rounding
- Net, gross, and tax amounts are rounded to 2 decimal places for display.
- Receipts may differ by a cent or two because stores round each line item before summing.
Limitations
- This calculator does not look up rates by location. Look up your local rate before relying on the result.
- Category-specific rates (food, clothing, prescriptions in some US states; reduced VAT bands in the EU) are not modelled.
- Sales-tax holidays and exemptions are not detected.
Quick reference — sales tax on common amounts
| Price | 6% | 7.25% | 8.875% (NYC) |
|---|---|---|---|
| $20.00 | $1.20 → $21.20 | $1.45 → $21.45 | $1.78 → $21.78 |
| $50.00 | $3.00 → $53.00 | $3.63 → $53.63 | $4.44 → $54.44 |
| $100.00 | $6.00 → $106.00 | $7.25 → $107.25 | $8.88 → $108.88 |
| $200.00 | $12.00 → $212.00 | $14.50 → $214.50 | $17.75 → $217.75 |
| $500.00 | $30.00 → $530.00 | $36.25 → $536.25 | $44.38 → $544.38 |
| $1,000.00 | $60.00 → $1,060.00 | $72.50 → $1,072.50 | $88.75 → $1,088.75 |
| $10,000.00 | $600.00 → $10,600.00 | $725.00 → $10,725.00 | $887.50 → $10,887.50 |
How do I add sales tax to a price?
Multiply the price by 1 plus the tax rate as a decimal: final price = price × (1 + rate ÷ 100). For $100 at 8% tax, $100 × 1.08 = $108. Set the calculator to “Add tax” mode (the default) and enter your local rate. To go the other way — find the pre-tax price from a tax-included total — switch to “Remove tax” mode.
What’s the sales tax rate in my state?
This calculator does not look up rates by location — you enter the rate yourself. Combined state + local rates in the US range from 0% (NH, OR, MT, AK, DE) to roughly 9.55% (TN). City and county add-ons vary; the receipt or your state’s tax site has the exact number.
Why do I get a slightly different number than the receipt?
Most often it’s rounding. Stores round each line item, so the receipt total can differ by a cent or two from a calculation done on the subtotal. Some jurisdictions also tax certain categories (food, clothing) at different rates than general goods.
How do I remove tax from a total that includes it?
Switch the calculator to “Remove tax” mode. If you paid $108 at an 8% rate, the original was $108 ÷ 1.08 = $100, and the tax was $8.
Is sales tax the same as VAT?
Mathematically yes — both are a percentage added to a price. The legal and accounting differences (who collects, who can reclaim, when it’s due) are different, but for figuring out a final price the formula is identical.
How much is sales tax on $100?
At 6% it’s $6.00 (total $106.00), at 7.25% it’s $7.25 (total $107.25), at 8.875% it’s $8.88 (total $108.88). The same math scales by a factor of ten: tax on $1,000 at 7.25% is $72.50. Enter your amount and local rate above for the exact figure.