Business and GST calculators
GST and growth maths for traders and businesses. Free, with every formula shown and no sign-up.
Rules for FY 2026-27 · Checked 24 October 2026
- CalculatorGST calculatorAdd or remove GST at 5%, 18% or 40%, with CGST and SGST.
- CalculatorCAGR calculatorThe yearly growth rate between two values.
About these calculators
From 22 September 2025, most goods and services carry GST at 5% or 18%, with 40% on a short list of luxury and sin goods. These calculators add GST to a price, take it out of a GST-inclusive price, and split it into CGST and SGST.
For growth figures, use the CAGR and compound interest calculators to compare sales, prices or returns across years.
Frequently asked questions
How do I remove GST from a price?
Divide by (100 + rate) and multiply by 100. ₹1,180 including 18% GST is ₹1,000 plus ₹180 of GST.
What are the GST rates now?
0%, 5%, 18% and 40%, with a special 3% rate on gold, silver and jewellery. The old 12% and 28% slabs were removed on 22 September 2025.
When is IGST charged instead of CGST and SGST?
On sales from one state to another. Within one state, GST is split equally between CGST and SGST.