Quickly calculate GST online, add VAT/GST to a net price, remove GST from a tax-inclusive total, or estimate sales tax after a discount. This GST calculator online works for invoices, shopping, business pricing, and tax-inclusive price checks.
Calculate GST, VAT, or sales tax from a price.
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To calculate GST online, enter the price and GST rate, then choose whether the price is before tax or already includes tax. To add GST/VAT to a price, multiply the pre-tax price by the tax rate, then add that tax to the price. To remove GST/VAT from a tax-inclusive total, divide the total by 1 plus the tax rate.
Example: $100 with 5% GST becomes $105 total. A $105 tax-inclusive total at 5% GST equals $100 before tax and $5 GST.
A VAT / GST Calculator is a simple and essential tool for businesses and consumers alike. It performs two very specific functions: it lets you add tax to a net price to find the total gross price, or it lets you remove tax from a gross price to find the original net price. VAT (Value Added Tax) and GST (Goods and Services Tax) are both common types of sales tax used worldwide, and this calculator works for either one.
The math is simple, but it's different depending on whether you are adding or removing the tax. The most common mistake is using the wrong formula when trying to remove tax.
This is used when you have the pre-tax price (Net Price) and want to find the final price (Gross Price).
Gross Price = Net Price × (1 + Tax Rate)
This is used when you have the final price (Gross Price) and want to find the original price (Net Price).
Net Price = Gross Price / (1 + Tax Rate)
In both cases, the "Tax Rate" is the percentage as a decimal (e.g., 20% = 0.20).
You want to sell a product for $1,000 and need to add 20% VAT.
Gross Price = $1,000 × (1 + 0.20) = $1,000 × 1.20 = $1,200
Tax Amount = $1,200 - $1,000 = $200
You bought an item for $1,200, which included 20% VAT, and you want to remove the tax to find the original price.
Net Price = $1,200 / (1 + 0.20) = $1,200 / 1.20 = $1,000
Tax Amount = $1,200 - $1,000 = $200
Note: You do NOT calculate $1,200 * 20% ($240). This is the most common error. The 20% was applied to the original $1,000 price, not the final $1,200 price.
GSC data shows related demand for discount calculator with tax, discount and tax calculator, and sales tax after discount. In most retail examples, calculate the discounted price first, then calculate GST or sales tax on that discounted price.
Discounted price = Original price x (1 - Discount rate)
Final price with tax = Discounted price x (1 + GST or sales tax rate)
Example: $100 with a 20% discount becomes $80. Add 10% GST or sales tax: $80 x 1.10 = $88 final price.
Use the Discount Calculator first when you need the sale price, then use this GST calculator to add tax to the discounted total.
This sales tax calculator is used daily by millions of people:
VAT and GST rates vary significantly by country and sometimes even by product (e.g., food vs. luxury items). Here are some common standard rates:
Enter the amount, choose add or remove GST, and enter the GST rate. To add GST, use price x (1 + GST rate). To remove GST from a tax-inclusive total, use total / (1 + GST rate).
To add GST to a price, multiply the pre-tax price by 1 plus the GST rate as a decimal. For example, $100 with 5% GST is $100 x 1.05 = $105, and the GST amount is $5.
To calculate GST from a tax-inclusive total, divide the total by 1 plus the GST rate to get the pre-tax price, then subtract that pre-tax price from the total. For example, $105 including 5% GST gives $105 / 1.05 = $100 before tax and $5 GST.
Apply the discount first, then calculate GST or sales tax on the discounted price unless your local invoice rules say otherwise. For example, $100 after a 20% discount is $80, and 10% tax makes the final total $88.
VAT means Value Added Tax and GST means Goods and Services Tax. Both are consumption taxes added to goods or services, and this calculator can add or remove either tax type when you enter the correct rate.
Five percent GST means $5 of tax for every $100 before tax. A $100 item becomes $105 after 5% GST, while a $105 tax-inclusive total contains $5 GST and $100 before tax.
After calculating GST or sales tax, you might need to find your sale price or profit. Use our Discount Calculator, Profit Margin Calculator, or Markup Calculator to complete your business pricing workflow.
Want the background and formulas behind this calculator? Read the companion guide.
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