A GST calculator is a free online tool that gives you instant results without any signup or fees. It covers goods and services tax, CGST, SGST and more — all in one place.
GST Calculator India 2026
Add or remove GST for any amount at 5%, 12%, 18% or 28% slab. Shows CGST and SGST split for intra-state or IGST for inter-state transactions.
Reverse GST Calculator
To find base price from GST-inclusive amount: divide total by (1 + GST rate/100). For Rs 11,800 at 18%: 11800 / 1.18 = Rs 10,000 base price.
GST Rate List 2026
0%: vegetables, milk, books. 5%: packaged food, tea. 12%: mobile phones. 18%: restaurants, IT services, soap. 28%: luxury cars, cement, tobacco.
CGST vs SGST vs IGST
Same state transaction: GST splits equally into CGST and SGST. Different state transaction: only IGST applies. This calculator shows both breakdowns.
GST Calculator for Business
Businesses with turnover above Rs 40 lakh (goods) or Rs 20 lakh (services) must register for GST. Use this calculator for invoice preparation.
Frequently Asked Questions
How to calculate GST on a product?
Multiply the base price by GST rate and divide by 100. For Rs 10,000 at 18% GST: tax = 10000 x 18 / 100 = Rs 1,800. Total price = Rs 11,800. The GST calculator above does this instantly.
What is reverse GST calculation?
Reverse GST finds the original price when you know the total GST-inclusive amount. Formula: base price = total x 100 / (100 + rate). For Rs 11,800 at 18%: 11800 x 100 / 118 = Rs 10,000.
What are the GST rates in India 2026?
India has five GST slabs: 0% on essential items, 5% on packaged foods and economy services, 12% on electronics and business class travel, 18% on most services and FMCG, 28% on luxury goods and vehicles.
What is the GST threshold limit?
GST registration is mandatory if annual turnover exceeds Rs 40 lakh for goods or Rs 20 lakh for services. In North-East states, limits are Rs 20 lakh for goods and Rs 10 lakh for services.
What is CGST and SGST?
When goods or services are sold within the same state, the total GST splits equally: half goes to central government as CGST and half to the state government as SGST. For inter-state sales, IGST applies instead.