Our easy GST calculator covers every major GST jurisdiction. Click any country to load the correct rate and currency instantly.
Australia has a flat 10% GST on most goods and services. Our AU GST calculator and Australia GST calculator use the standard rate with AUD currency.
India has five GST slabs. Our Indian GST calculator lets you select the right slab for your product — from 0% essentials to 28% luxury goods.
New Zealand GST is 15% on most goods and services. Use our NZ GST calculator or New Zealand GST calculator with NZD for accurate calculations.
Canada federal GST is 5%. Provinces add PST or HST. Our Canada GST calculator computes federal GST. Add provincial tax separately for total.
Our free GST calculator online is more complete than Wise's VAT/GST calculator, calculatestuff, and Omni calculator GST tool — because it covers 6 countries in one tool with both Add GST and reverse GST calculator modes, India's five-slab system, live-updating results as you type, and a visual price breakdown showing exactly how GST divides from the base price. Whether you need an Australian GST calculator, NZ GST calculator, India GST calculator, Canada GST calculator, or Singapore GST calculator, this single easy GST calculator handles everything — no signup, no limits.
The GST calculator formula has two directions depending on what you know:
Add GST (exclusive → inclusive): GST = Price × Rate ÷ 100 · Final = Price × (1 + Rate/100)
Remove GST / Reverse GST: Pre-Tax = Inclusive ÷ (1 + Rate/100) · GST = Inclusive − Pre-Tax
Australia (10%) — Add GST: Product costs $850 (ex-GST). GST = $850 × 10% = $85. Final price = $935.
NZ (15%) — Remove GST: Paid $460 NZD (GST inclusive). Pre-tax = $460 ÷ 1.15 = $400. GST = $60.
India (18%) — Add GST: Service fee ₹5,000. GST = ₹5,000 × 18% = ₹900. Total = ₹5,900.
Canada (5%) — Add GST: Item costs $200 CAD. GST = $200 × 5% = $10. Total = $210.
Singapore (9%) — Remove GST: Receipt shows S$327. Pre-tax = $327 ÷ 1.09 = $300. GST = $27.
Australia's GST is a flat 10% on most goods and services, introduced under the A New Tax System (Goods and Services Tax) Act 1999. The Australian GST calculator and AU GST calculator are the most searched GST tools online. Key facts for our Australia GST calculator:
The reverse GST calculator (also called the remove GST calculator) works backward from a GST-inclusive price to find the original pre-tax amount. This is the most commonly needed tool for businesses reviewing receipts, reconciling accounts, or checking if a price quoted includes GST.
| GST-Inclusive Price | Country/Rate | Pre-Tax (Ex-GST) | GST Amount |
|---|---|---|---|
| $110 | Australia 10% | $100.00 | $10.00 |
| $115 | New Zealand 15% | $100.00 | $15.00 |
| $105 | Canada 5% | $100.00 | $5.00 |
| $109 | Singapore 9% | $100.00 | $9.00 |
| ₹118 | India 18% | ₹100.00 | ₹18.00 |
| ₹128 | India 28% | ₹100.00 | ₹28.00 |
India's GST system is unique among all major GST countries — it uses five different rates instead of a single flat rate. Our Indian GST calculator includes all five slabs: 0% (essential goods), 5% (basic necessities and economy services), 12% (processed foods, standard goods), 18% (most goods and services — the standard slab), and 28% (luxury goods, tobacco, high-end vehicles). For each item, CGST = SGST = half the total GST rate. Our India GST calculator shows CGST and SGST split automatically.
New Zealand's GST rate is 15%, one of the highest flat GST rates in the world. Our NZ GST calculator and New Zealand GST calculator apply 15% to any amount. Key NZ GST facts: GST was introduced in NZ in 1986 at 10%, raised to 12.5% in 1989, and increased to 15% in 2010. The NZD currency is used. Quick mental math: 15% GST means every $115 inclusive price contains $15 GST (divide the inclusive price by 115 and multiply by 15 to find GST).
Our Canada GST calculator applies the federal GST rate of 5%. Note: Canada also has provincial sales taxes — Ontario, New Brunswick, Newfoundland, Nova Scotia, and PEI use HST (combined federal+provincial). British Columbia, Manitoba, Quebec, and Saskatchewan have separate PST. Our GST calculator Canada covers federal GST only — add your province's PST/HST rate separately for total tax. The Singapore GST calculator uses 9% (effective January 2024, raised from 8%).
Quick mental math tip: For Australia 10% GST — to find GST in a price, simply divide by 11. $220 ÷ 11 = $20 GST. For New Zealand 15% — multiply the inclusive price by 3 then divide by 23. $115 × 3 ÷ 23 = $15 GST. Or just use our online GST calculator for instant and accurate results every time.
Questions covering the GST formula, Australia GST, NZ GST, Canada GST, India GST, reverse GST calculator, and how to remove GST from a price.
GST (Goods and Services Tax) is a consumption tax levied on goods and services at each stage of the supply chain. The end consumer pays the full GST. Add GST formula: GST Amount = Price × (Rate ÷ 100). Final = Price × (1 + Rate/100). Example at 10%: $500 × 1.10 = $550. GST = $50. Remove GST (reverse): Pre-tax = Inclusive ÷ (1 + Rate/100). Example: $550 ÷ 1.10 = $500. GST = $50. Our easy GST calculator does both instantly — select "Add GST" or "Remove GST" mode.
Click the 🇦🇺 Australia button — the rate auto-sets to 10% and currency to AUD. For Add GST: enter your ex-GST price (e.g. $850). Result: GST = $85, final = $935. For Remove GST (the reverse/remove GST calculator): enter the GST-inclusive price (e.g. $935). Result: GST = $85, pre-tax = $850. The AU GST calculator and Australia GST calculator rate is fixed at 10% by law — you cannot change it for Australian GST calculations.
The reverse GST calculator (or remove GST calculator) works backward — you know the GST-inclusive total and want to find the pre-tax price and GST amount. Formula: Pre-Tax Price = Inclusive Price ÷ (1 + GST Rate/100). GST Amount = Inclusive − Pre-Tax. Examples: NZ 15%: $460 ÷ 1.15 = $400 pre-tax, $60 GST. India 18%: ₹2,360 ÷ 1.18 = ₹2,000, GST ₹360. Click the "Remove GST" tab in our online GST calculator and enter the inclusive price — results appear instantly.
GST rates by country: Australia 10% (flat, most goods/services). New Zealand 15% (our NZ GST calculator / New Zealand GST calculator). Canada 5% federal GST (our Canada GST calculator) — provinces add PST or use HST up to 15%. Singapore 9% (raised from 8% in January 2024). India 0% / 5% / 12% / 18% / 28% — five slabs (our Indian GST calculator lets you choose). Click the country flag button in our GST calculator online to instantly load any country's rate.
India's GST has five slabs: 0% (fresh food, newspapers, basic medicines), 5% (essential goods, transport), 12% (processed foods, smartphones), 18% (most goods, restaurants, IT services — the standard rate), 28% (luxury goods, tobacco, high-end vehicles). Our Indian GST calculator and India GST calculator show CGST + SGST split automatically (each = GST rate ÷ 2). Select the India flag, then choose your slab from the dropdown. For example, a software service at 18%: ₹10,000 + ₹900 CGST + ₹900 SGST = ₹11,800 total.
The GST calculator formula is the same regardless of country — only the rate changes. NZ GST calculator (15%): Add: price × 1.15. Remove: price ÷ 1.15. Mental shortcut: GST in inclusive price = inclusive × 3/23. Canada GST calculator (5%): Add: price × 1.05. Remove: price ÷ 1.05. Mental shortcut: GST = inclusive ÷ 21. Singapore GST calculator (9%): Add: price × 1.09. Remove: price ÷ 1.09. Our gst calculator online applies all these formulas automatically — click the country and enter the amount.