GST Calculator
Add or remove GST from any amount. Supports India (5%, 12%, 18%, 28%), Australia (10%), New Zealand (15%) and custom rates. Shows CGST and SGST split.
✅ Free 🇮🇳 India Rates 🌏 Global Rates 🔒 Private
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GST CalculatorAdd GST (excl. → incl.)
Remove GST (incl. → excl.)
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India GST Rates
Pre-loaded with all four Indian GST slabs: 5%, 12%, 18% and 28%.
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Global Support
Australia 10% GST, New Zealand 15% GST and custom rate for any country.
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CGST + SGST Split
Automatically shows the 50/50 split between CGST and SGST.
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Private
All calculations run in your browser. Nothing stored.
⭐ User Reviews
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Alex T.
Yesterday
⭐⭐⭐⭐⭐
Exactly what I needed — clean inputs, instant results, and the breakdown shows the working so I can double-check. Bookmarked.
Calculator ToolsS
Sara K.
2 days ago
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I use this every week for my freelance invoicing. The copy buttons save so much time when pasting into spreadsheets.
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Dan M.
1 week ago
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No ads cluttering the page, no sign-up wall. Just enters the numbers and get the answer. Refreshingly simple.
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Laura B.
2 weeks ago
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The formula explanation below the result is a great learning aid. I now understand the maths behind what I was calculating.
Calculator Tools📖 How to Use
1
Enter the amount
Type the price in the amount field.
2
Select GST rate
Choose from the preset rates or enter a custom rate.
3
Choose mode
Select Add GST or Remove GST depending on your need.
4
Read results
Pre-GST, GST amount, CGST, SGST and total all shown.
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❓ FAQ
What is GST?+
GST (Goods and Services Tax) is a value-added tax applied to most goods and services in countries including India, Australia, Canada, New Zealand and Singapore. It is calculated as a percentage of the sale price.
What are the GST slabs in India?+
India has four GST rate slabs: 5% (essential goods like food grains), 12% (standard goods like processed foods), 18% (most services and standard goods), and 28% (luxury goods, tobacco, aerated drinks). Some items are exempt (0%).
What is the difference between CGST and SGST?+
In India, GST is split equally between the Central Government (CGST) and the State Government (SGST) for intra-state transactions. For inter-state transactions, IGST (Integrated GST) applies at the full rate. CGST + SGST = total GST.
How do I remove GST from an inclusive price?+
Pre-GST price = GST-inclusive price ÷ (1 + GST rate/100). For ₹118 including 18% GST: pre-GST = ₹118 ÷ 1.18 = ₹100. Use the "Remove GST" tab for this calculation.
What is Australia's GST rate?+
Australia has a flat 10% GST rate on most goods and services. Some items are GST-free: fresh food, medical services, education and exports. The NZ GST rate is 15%.