Sales Tax Calculator
Enter a price and your sales tax rate to add tax, or start with a tax-inclusive price to work out the original price and tax amount.
GST, VAT, SST, or sales tax as a percent.
Results
- Total (with tax)
- 108.00
- Tax amount
- 8.00
- Price before tax
- 100.00
Total = exclusive x (1 + rate / 100)
For quotes and checks only. Confirm the correct rate for your location.
Sales tax formula
For sellers who keep a clean pre-tax price and need the chat quote with tax on top.
- 01
Enter the pre-tax price
Your base amount before GST, VAT, SST, or sales tax.
- 02
Enter the tax rate %
Example: 18 for 18% GST, 5 for 5% VAT, 6 for 6% SST.
- 03
Read tax and total
See how much tax to add and the inclusive total to send in chat.
- 04
Send the quote
Share base, tax, and total so the buyer knows what they are paying.
How to add sales tax
Your sheet may store pre-tax numbers. Buyers in chat need the final amount.
Total ready for the DM
Base in, rate in, total out before you hit send.
Clear breakdown
Show tax and total so there is less back-and-forth on what the price includes.
No signup
Calculate in the browser. Nothing to install.
Stays on your device
Prices are not uploaded. The math runs on this page only.
Sales tax formula
Add tax on top, or remove it from a price that already includes it. The last row is the reverse of 18%.
| Price you enter | Rate | Tax | Other side |
|---|---|---|---|
| 100 | 10% | 10 | 110 |
| 100 | 18% | 18 | 118 |
| 100 | 20% | 20 | 120 |
| 118 | 18% removed | 18 | 100 |
Add: tax = price x rate / 100. Remove: base = price / (1 + rate / 100).
Related tools
Other free tools for the same job.
Markup Calculator
Add markup to a cost price and get the selling price.
Add markup
Profit Margin Calculator (Margin and Markup)
See margin and markup from cost and selling price.
Check the margin
Reverse Sales Tax Calculator
Strip sales tax out of a price that already includes it.
Remove sales tax
GST Calculator
Add GST to a price, or remove GST from a price that already includes it.
Add GST
VAT Calculator
Add VAT to a price, or remove VAT from a price that already includes it.
Add VAT
Tax-exclusive questions
How tax is added, which rates to use, and how this pairs with Orders App.
What is sales tax?
A percent added to a sale. The buyer pays the price plus that percent. The rate depends on the country or state.
What is this sales tax calculator?
Type a price and a rate. Add mode puts tax on top. Remove mode takes tax back out of a price that already includes it.
What does tax-exclusive mean?
The price does not include tax yet. You add tax on top to get what the buyer pays.
What is the formula?
Tax = exclusive x (rate/100). Total = exclusive + tax. Example: 100 at 18% → tax 18, total 118.
Which tax rate should I enter?
Use the rate that applies to that sale in your country or state. This tool does not pick the rate for you.
Is this legal tax advice?
No. It is simple arithmetic for quotes. Check local rules or an accountant for filing.
Is the tool free?
Yes. No signup. Orders App is separate if you later want DM orders captured into a list automatically.
Get your orders out of your DMs
Download Orders App and every message becomes a clean, shippable order with the product, address, and contact already filled in.
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