GST Calculator
Calculate Goods and Services Tax (GST) for inclusive and exclusive transactions, split CGST and SGST, and determine net invoice prices.
About the GST Calculator
The Goods and Services Tax (GST) Calculator automates tax invoicing for business owners, freelance contractors, accountants, and retail consumers. GST is a comprehensive destination-based value-added tax applied to the manufacture, sale, and consumption of goods and services.
This tool supports two standard commercial modes: GST Exclusive (adding tax to a base price) and GST Inclusive (reverse-calculating the pre-tax base price and exact tax portion from a gross retail sticker price). Select from standard GST brackets (such as 5%, 12%, 18%, 28%) or enter custom rates.
How to Calculate GST
Enter the transaction Amount.
Select whether the price is GST Exclusive (add tax) or GST Inclusive (remove tax).
Select a standard tax rate (e.g., 5%, 12%, 18%, 28%) or enter a custom rate.
Click Calculate to see the pre-tax base price, GST tax portion, CGST/SGST split, and final invoice price.
GST Inclusive & Exclusive Formulas
GST Exclusive (Add GST): GST Amount = Base Price × (GST Rate / 100) Final Price = Base Price + GST Amount GST Inclusive (Remove GST): Base Price = Gross Amount / (1 + GST Rate / 100) GST Amount = Gross Amount - Base Price
To add GST, multiply base amount by rate. To extract GST from a total, divide the gross sum by 1 plus the decimal rate.
Variable Descriptions
- Base Price
- Pre-tax net price of the product or service
- GST Rate
- Applicable statutory tax percentage bracket
- CGST / SGST
- Central and State GST components (each equals 50% of total GST in India)
Worked Example
Important Considerations & Tips
- For intrastate transactions in India, GST is divided equally between CGST (Central GST) and SGST (State GST).
- For interstate sales across state boundaries, the entire tax is designated as IGST (Integrated GST).
- Selectable standard GST rates include 0%, 5%, 12%, 18%, and 28%.
Frequently Asked Questions
How do you calculate GST inclusive price?
Divide the total inclusive price by (1 + GST Rate / 100). For an 18% GST rate, divide the total price by 1.18 to determine the base price before tax.
What is the difference between GST inclusive and exclusive?
GST Exclusive means tax is not yet added to the price. GST Inclusive means the listed price already incorporates the tax.
What are CGST, SGST, and IGST?
In India, CGST goes to the central government, SGST goes to the state government for local sales, and IGST applies to sales across state lines.
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