What is a GST calculator?
A GST calculator is a simple online tool that works out Goods and Services Tax on any price in India. Type an amount, pick a GST slab — 3%, 5%, 12%, 18% or 28% — and choose whether to add GST to a base price (exclusive → inclusive) or remove GST from an MRP or invoice total (inclusive → exclusive). The tool instantly shows the base value, the GST amount, the CGST/SGST split, and the final price.
GST calculation formula
Add GST: GST = Base × Rate ÷ 100 → Total = Base + GST
Remove GST: Base = Total × 100 ÷ (100 + Rate) → GST = Total − Base
Remove GST: Base = Total × 100 ÷ (100 + Rate) → GST = Total − Base
Example: a service billed at ₹10,000 with 18% GST becomes ₹11,800 (GST ₹1,800, split into ₹900 CGST + ₹900 SGST for a within-state sale). Going the other way, an MRP of ₹1,180 at 18% contains a base price of ₹1,000 and ₹180 of GST.
GST rate slabs in India
| Slab | Typical goods & services |
|---|---|
| 0% | Unbranded food grains, fresh vegetables, milk, printed books, healthcare, education |
| 3% | Gold, silver and jewellery of precious metals |
| 5% | Packaged food items, footwear up to ₹1,000, economy transport, restaurants |
| 12% | Butter and ghee, processed foods, apparel above ₹1,000, exercise books |
| 18% | Most services, electronics, soaps and cosmetics, IT services, telecom |
| 28% | Air conditioners, cement, motor vehicles, aerated drinks (plus cess on some) |
Why use GST Calculator Pro?
- Free and unlimited — no registration, no paywall, no limits.
- Mobile-first — big touch targets and instant results on any phone.
- Bilingual — switch the interface between English and हिंदी with one tap.
- Complete toolkit — GST split, reverse GST, invoices, TDS, income tax and advance tax calculators in one place.