GST / VAT Calculator
This GST calculator adds tax to a net figure or backs it out of a tax-inclusive total, showing net, tax and gross side by side. Pick a preset slab or type any rate, then copy the breakdown.
Add or remove tax.
This is a simplified estimate for general information only — not financial, tax, or legal advice. Real figures vary by lender, rate, jurisdiction and your own circumstances, so confirm with a qualified professional before acting.
How to use GST / VAT Calculator
- Enter the amount and pick a rate preset or type your own
- Choose whether to add tax to net or remove it from gross
- Read the tax amount with net and gross totals
About GST / VAT Calculator
The GST/VAT Calculator works out the tax on any amount in seconds. Type a figure, set a rate, and choose whether to add tax to a net price or peel tax out of a gross, tax-inclusive total. It shows the tax portion next to the net and gross figures in a clear stat grid, and one click copies the whole breakdown to your clipboard.
The rate box takes any number, so the same tool covers most places that charge GST, VAT or HST. Type 10 for Australian GST, 15 for New Zealand's GST, or 5 for Canada's federal GST — and for a Canadian province that charges HST, just enter its combined rate, such as 13 or 15. India's four slabs (5, 12, 18 and 28%) are one-tap preset buttons, with 18% as the default. Amounts can be formatted in nine currencies, including the Australian and Canadian dollar, so the output reads the way an invoice would.
Net, tax and gross show to two decimal places while the arithmetic runs at full precision, and the copy button hands you those same figures on three plain-text lines. It is free, with no sign-up and no limits, and every calculation runs entirely in your browser — the amount, rate and currency you enter are never sent to a server or stored anywhere.
Frequently asked questions
- How do I add GST to a net price?
- Set Mode to "Add tax", then enter the pre-tax amount and the rate; the tool puts the GST on top. At 10% on 100, for example, it shows 10 tax and a gross of 110. Switch to "Remove tax" instead when your starting figure already includes GST.
- How do I find the GST or VAT already included in a price?
- Set Mode to "Remove tax" and enter the tax-inclusive figure. The tool divides it by 1 plus the rate (so 1,180 at 18% becomes 1,000), and the difference between the two — 180 — is the tax portion.
- How do I calculate Australian GST?
- Australia's GST is a flat 10%, so type 10 in the rate box. Use "Add tax" to put 10% on a net price, or "Remove tax" to pull the GST out of a GST-inclusive total — a 110 total becomes 100 plus 10 GST. Set the currency to Australian dollar so the amounts format correctly.
- Can I use this as a GST/HST calculator for Canada?
- Yes. Enter 5 for the federal GST, or your province's combined HST rate — such as 13 for Ontario or 15 for the Atlantic provinces — since the tool reports it as one tax figure. Choose Canadian dollar for formatting and switch between Add and Remove tax as needed.
- How do I work out New Zealand GST?
- New Zealand's GST is 15%, so type 15 as the rate. "Add tax" puts it on a net price and "Remove tax" takes it out of a GST-inclusive total, where a 115 figure splits into 100 plus 15 GST. The New Zealand dollar isn't one of the nine currency formats, but that only changes how the number is displayed, not the calculation.
- What do the 5, 12, 18 and 28% preset buttons mean?
- They are India's four main GST slabs, so one tap sets a standard rate; 18% is the default. The rate box also accepts any other figure you type, such as 10 for Australian GST, 20 for UK VAT or 7.5 for a half-percent rate.
- Which currencies can it display?
- Nine: Indian rupee (the default), US dollar, euro, British pound, Canadian dollar, Australian dollar, Singapore dollar, UAE dirham and South African rand. The picker only changes how amounts are formatted — it does not convert between currencies and does not change the rate presets.
- Does it split GST into CGST and SGST?
- No. It reports one combined tax figure. For an intra-state Indian invoice, halve it yourself: 18% on 1,000 gives 180, which is 90 CGST plus 90 SGST.
- Can I enter a decimal or zero tax rate?
- Yes. The rate field takes any non-negative number, including decimals like 7.5 or 12.5, and there is no upper limit. A rate of 0 simply returns the amount unchanged with zero tax.
- How are the figures rounded?
- Net, tax and gross are all displayed to two decimal places in the currency you selected, while the arithmetic itself runs at full precision. Copy breakdown puts those same two-decimal figures on three plain-text lines, ready to paste into an invoice.
- What happens if I type a negative amount or rate?
- Nothing is calculated. The tool shows "Enter a valid non-negative amount and tax rate" until both the amount and the rate are zero or above.
- Do my invoice figures leave the page?
- No. The amount, rate and currency are held in the page only long enough to do the arithmetic; there is no server call anywhere in the calculation or in the copy button.