Reverse Sales Tax Calculator
Find the pre-tax price from a tax-included total.
Enter your values
Enter the total price paid (tax included) in $.
Enter the sales tax rate in %.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Pre-tax price
- $100.00
- Sales tax amount
- $7.50
- Total paid
- $107.50
Quick answer
The pre-tax price equals the total paid divided by one plus the tax rate.
Pre-tax price = total / (1 + tax rate)
At a glance
| What it does | Find the pre-tax price from a tax-included total. |
|---|---|
| Category | Finance |
| Inputs needed | Total price paid (tax included), Sales tax rate |
| Main output | Pre-tax price |
| Formula | Pre-tax price = total / (1 + tax rate) |
| Cost | Free — no sign-up, no download |
How to use the Reverse Sales Tax Calculator
- 1Enter the total amount you paid, including tax.
- 2Enter the sales tax rate that applied.
- 3Read the original pre-tax price and the tax portion of your total.
Inputs explained
- Total price paid (tax included)($)
- Enter the total price paid (tax included) in $.
- Sales tax rate(%)
- Enter the sales tax rate in %.
Worked example
Using the values the calculator loads with:
Inputs
- Total price paid (tax included)107.50 $
- Sales tax rate7.5 %
Results
- Pre-tax price$100.00
- Sales tax amount$7.50
- Total paid$107.50
Frequently asked questions
When is this useful?
Handy for expense reports, reimbursements, or figuring out a receipt that only shows the final total.
Does this handle multiple tax rates (state + local)?
Yes — just enter the combined total sales tax rate that applied to the purchase.
What do I need to enter into the Reverse Sales Tax Calculator?
Just 2 values: total price paid (tax included), sales tax rate. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Reverse Sales Tax Calculator work out the answer?
The pre-tax price equals the total paid divided by one plus the tax rate. It applies the formula Pre-tax price = total / (1 + tax rate) and shows the working so you can check each step by hand.
Is the Reverse Sales Tax Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.