Sales Tax Calculator
Add tax to a pre-tax price, or back out pre-tax from a total. You enter the rate — no live lookup. Click any i for detail.
Tax
Mode
i
Mode
Add tax to a pre-tax amount, or extract pre-tax from a total that already includes tax. |
|
|---|---|
Amount ($)
i
Amount
Pre-tax price (add mode) or total paid (extract mode). |
|
Tax rate (%)
i
Rate
Combined state + local rate you were quoted or looked up. |
How to use this calculator
- Choose add or extract.
- Enter the amount.
- Enter the combined sales-tax rate.
- Read pre-tax, tax, and total.
Results explained
Add: total = amount × (1 + rate). Extract: pretax = total ÷ (1 + rate).
Quick reference: sales tax
You supply the rate.
| Item | Detail |
|---|---|
| Add tax | total = pretax × (1 + r) |
| Extract tax | pretax = total ÷ (1 + r) |
| Tax dollars | total − pretax |
| Live rate lookup | Not included — no feed |
District rates change. Confirm on your receipt or state site.
How the estimate is built
See reference table. Rate is entered as a percent (8.25 → 0.0825).
Example scenario
$100 pre-tax at 8.25% is $8.25 tax and $108.25 total.
FAQ
Why don’t you look up my ZIP?
Calcscape stays math-only with no live rate feeds.
VAT vs sales tax?
Same add/extract math if the rate is inclusive or exclusive as you choose.
Excise + sales tax?
Run stacked rates separately or combine them into one percent.