GST Calculator
Compute GST-inclusive or GST-exclusive amounts instantly with custom tax rates.
GST Calculator
Add or Remove GST
How to Add or Remove GST
GST (Goods and Services Tax) is a value-added tax levied on goods and services. A GST calculator helps businesses and shoppers determine the tax amount and total price.
Formula to Add GST
GST Amount = Net Amount × (GST % / 100)
Total (Gross) Price = Net Amount + GST Amount
Formula to Remove GST
Net Price = Gross Amount / (1 + (GST % / 100))
GST Amount = Gross Amount - Net Price
For example, if you want to add 18% GST to $1000, the tax is $180, giving a total of $1180. To remove 18% GST from $1180, you divide by 1.18 to get a net price of $1000, meaning the tax removed is $180.
Frequently Asked Questions
To add GST, multiply the original price by (1 + GST%/100). For an 18% GST rate, multiply the price by 1.18.
To remove GST, divide the total price by (1 + GST%/100). For an 18% GST rate, divide the gross total by 1.18.
GST rates vary by country and category. Standard rates are typically 5%, 12%, 18%, or 28% in India, 15% in New Zealand, and 10% in Australia. Our GST calculator allows you to enter any custom tax percentage.