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GST / VAT Calculator
Add or remove GST, VAT, or sales tax from any amount instantly. Split into CGST + SGST or IGST for India, or calculate tax across a full invoice with multiple line items.
Understanding GST & VAT
Adding Tax
Start with the base (pre-tax) price and add the tax on top — used when quoting prices before tax is applied.
Removing Tax
Start with a tax-inclusive price (like an MRP or receipt total) and extract the base price and tax portion.
CGST + SGST vs IGST
In India, intra-state sales split GST equally into CGST and SGST; inter-state sales charge the full rate as IGST instead.
Bulk Invoices
Add multiple line items with different amounts and rates to get an instant invoice-level subtotal, tax, and grand total.
How to Use the GST & VAT
Pick a Direction
Choose "Add Tax" if you have a pre-tax price, or "Remove Tax" if your amount already includes tax.
Enter Amount & Rate
Type the amount and pick a common rate chip, or enter any custom percentage. Results update instantly.
Check the Split
Switch to CGST/SGST Split for the India-specific breakup between intra-state and inter-state transactions.
Use Bulk Invoice Mode
Add several line items with their own amounts and rates to get a full invoice subtotal, tax, and total — exportable as CSV.
Frequently Asked
Questions
1. How do I calculate GST from a total amount?
Switch to “Remove Tax” mode, enter the total (tax-inclusive) amount, and set the rate. The base amount is calculated as Total ÷ (1 + rate/100), and the tax amount is the difference between the total and the base.
2. What is the difference between CGST, SGST, and IGST?
For intra-state sales in India, GST is split equally into CGST (collected by the central government) and SGST (collected by the state government) — for example, 18% GST becomes 9% CGST + 9% SGST. For inter-state sales, the full rate is charged as a single IGST instead of being split.
3. Does this tool work for VAT and sales tax outside India?
Yes. The Single Calculator and Bulk Invoice modes work with any percentage-based tax — GST, VAT, or sales tax — in any currency. The CGST/SGST/IGST split is specific to India’s GST structure and can simply be skipped by users elsewhere.
4. Why do "Add Tax" and "Remove Tax" give different base amounts for the same total?
They don’t — they’re two directions of the same calculation. If you add 18% tax to a base of 1,000, you get a total of 1,180. If you then remove 18% tax from that same total of 1,180, you correctly get back a base of 1,000. Entering the total in “Add Tax” mode by mistake will give you an incorrect, inflated result.
5. Can I use this for multiple invoice items with different tax rates?
Yes — switch to Bulk Invoice mode, add a row per line item, and set a different amount and rate for each. The tool totals the subtotal, tax, and grand total across all rows automatically, and you can export the full invoice as a CSV file.
6. Is my data private? Is anything sent to a server?
100% private. All tax calculations run entirely in your browser using JavaScript. Nothing you enter — amounts, rates, or invoice details — is ever sent to any server.
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