Add or remove Goods & Services Tax (GST) from a price. Works for India, Australia, Canada, New Zealand, Singapore and more — see the net amount, the GST, and the gross total instantly.
Add or remove GST
Goods and Services Tax (GST) is a value-added consumption tax used in many countries. To add GST to a net price, multiply by the rate: GST = net × rate, and the gross price = net + GST. To remove GST from a GST-inclusive price, divide: net = gross ÷ (1 + rate). At an 18% rate (India's standard slab), a ₹100 net price becomes ₹118, and a ₹118 inclusive price contains ₹18 of GST.
GST rates vary by country: India uses slabs of 5%, 12%, 18%, and 28%; Australia and Canada (GST portion) are flat; New Zealand is 15%; and Singapore is 9%. The most common mistake is removing GST by simply subtracting the rate from the gross — you must divide instead, because the rate was applied to the net, not the total. This calculator handles both directions accurately for any rate.
Gross = Net × (1 + rate). A $100 item at 10% GST costs $110, of which $10 is GST.
Net = Gross ÷ (1 + rate). A $110 inclusive price holds $10 GST — not $11. Always divide, never subtract the rate.
India 5/12/18/28%, Australia 10%, Canada 5% (federal GST), NZ 15%, Singapore 9%. Tap a preset or enter your own.