Sales Tax Calculator
Amount ($) and Tax rate (%) are the only inputs. Calculate multiplies the pre-tax amount by that one rate and shows the tax in dollars plus the total with tax added on top.
How to use
- Type the price before tax in Amount ($). The box opens at 100 and steps by one cent.
- Type a single percentage in Tax rate (%). The sample 8.25 means 8.25 percent. Leave the number as 8.25, not 0.0825.
- Click Calculate. The large line is Total. The line under it lists Tax and Pre-tax.
- Edit either box and click Calculate again. Each click replaces the previous total; there is no second rate line to fill.
When it helps
Use it at a counter, on a contractor estimate, or on a cart total when the price is still pre-tax and you already know the one rate that applies to the whole bill. A city rate you copied from a receipt works. The page will not look a rate up for you.
If the question is "40 is what percent of 200," that is the second row on the percentage calculator, which is a different pair of buttons. If the money will sit and earn instead of being spent once, the compound interest calculator grows a lump sum. This page only marks up one purchase.
Limits
One rate only. There is no box for a state rate plus a local rate, and there is no tax-inclusive reverse mode that starts from a total and backs out the tax. Tax equals Amount ($) times Tax rate (%) divided by 100. Total equals amount plus that tax. The result is checkout arithmetic, not a figure from a tax agency and not a lender quote.
The form does not ask for ZIP code, product type, shipping, or an exemption for groceries or clothing. Whatever you type in Amount ($) is taxed at the full rate, including a zero rate. Display uses two decimal places. It does not follow a state's bracket rounding chart.
Questions
Why is the tax on 100 at 8.25 exactly 8.25?
Calculate does one multiplication. 100 times 0.0825 is 8.25, and the total line is 108.25. It does not add a second levy, round to a nickel, or pull a jurisdiction from your address.
Can I paste a price that already includes tax?
No. Enter the pre-tax amount. If you only have the after-tax total, this form will not split it into price and tax. There is no reverse switch.
What if part of the bill is taxed and part is not?
Run Calculate on the taxable portion only, then add the untaxed part yourself. The form has a single Amount ($) and will not keep two baskets.