GST Calculator
Add GST to a price or work out the GST inside an inclusive price, at the 2026 rates of 5%, 18% and 40% or any rate, with the CGST, SGST or IGST split.
Free · No upload · 100% on your device
How to use GST Calculator
- Choose the settings in the side panel.
- The result updates instantly. Select “Calculate” for a fresh one.
- Copy the result or download it.
Private by design. Everything you type, open or record is processed in this browser tab and is never uploaded to KittySuite.
About GST Calculator
Since 22 September 2025 most goods and services fall in the 5% or 18% slabs, with 40% for luxury and sin goods; 0.25% and 3% still apply to rough diamonds and to gold and silver. Choose a custom rate for older invoices at 12% or 28%. Check the HSN or SAC code for the exact rate of your product.
Everything is calculated in this browser tab and nothing you enter is sent anywhere. It keeps working offline once the page has loaded.
GST Calculator: frequently asked questions
How do I add GST to a price?
Enter the amount, choose “Before GST”, pick the rate and see the tax and the total.
How do I find the GST inside an inclusive price?
Choose “Including GST”. The tax is worked out from the total and the price before GST is shown.
Which GST rates are included?
The slabs since 22 September 2025: 5%, 18% and 40%, plus 0%, 0.25% and 3%. Choose Other for older 12% or 28% invoices, and check the HSN or SAC code for your product’s exact rate.
When is it CGST + SGST and when IGST?
CGST and SGST split the tax for supplies within your state; IGST applies to supplies to another state.