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Free GST Calculator
Add GST, VAT or HST to a price or remove it from a tax-inclusive total.
Add or remove GST at the rate you enter, and see the tax and total. The rates offered match the country you pick at the top of the page.
How to use the GST Calculator
- Select your country at the top of the page so the currency, tax names and rates match where you do business.
- Enter your numbers. Every result updates instantly and each line of the working is shown so you can check it.
- Use the PDF or print button to keep a record, and change one input at a time to compare scenarios.
What is the GST Calculator?
Quick, transparent maths helps you price, budget and plan taxes with confidence. Showing every step of a calculation makes the result easy to check and explain.
The GST Calculator is built for freelancers, small business owners and busy teams who want a professional result without installing software or creating an account.
Signplify tools run in your browser, so there is no signup, no watermark and no limit on how often you use it.
Getting started with the GST Calculator
Using the gst calculator takes a minute or two. Your progress is saved in this browser, so you can come back later.
Tips for better results
Treat every result as an estimate. Real tax depends on your full circumstances such as other income, credits and deductions.
Try best and worst cases. Run the numbers with a slightly lower price or higher cost to see how safe your margin is.
Check the tax year shown under the result. Rates and thresholds change, and the calculator notes which year its figures come from.
Privacy and where your data goes
Documents and files you use here are processed on your own device. Signplify does not receive what you type or the files you open, which makes it suitable for sensitive information. If you clear your browser data, any saved draft is removed.
Frequently asked questions
What do I enter in the GST calculator?
You enter Amount, GST Rate and Mode. The result updates as you type, so you can change one number and see the effect straight away.
What result does the GST calculator give for example numbers?
With the starting example (Amount $1,000, GST Rate 10% and Mode Add GST), it shows Gross amount (incl. GST) of $1,100.00, along with Net amount (excl. GST) $1,000.00 and GST (10%) $100.00. These are the US defaults; change the inputs to match your own situation.
Which country and currency does the GST calculator use?
It follows the country selected at the top of the page (United States, United Kingdom, Canada or Australia) for tax rates and wording, where they apply. The Currency box above the form lets you show amounts in another currency for this calculator only.
How accurate is the GST calculator?
It is an estimate based on the numbers you enter and the rates or formulas built into the tool. It is meant for planning and comparing options, so check important figures against official sources or a qualified professional before you rely on them.
Can I save or share the result from the GST calculator?
Yes. Copy result puts the figures on your clipboard as text, and you can also download the result as a PDF or PNG, or print it. Your inputs are remembered in this browser for next time.
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