GST calculator
Add or remove GST at 5%, 12%, 18% or 28% — inclusive or exclusive.
Quick answer
A GST calculator computes tax at 5%, 12%, 18% or 28% on an amount — either adding GST to an exclusive price or extracting the base amount and GST from an inclusive price.
Total with GST
18% GST on ₹10,000 (exclusive).
- Base amount
- ₹10,000
- GST amount
- ₹1,800
- Total
- ₹11,800
Rates & rules checked on 15 June 2026 · based on FY 2025-26 (AY 2026-27).
What this tells you
GST (Goods and Services Tax) is India's unified indirect tax on most goods and services. Businesses quote prices either exclusive of GST (you pay base + tax) or inclusive (tax is embedded in the sticker price).
This calculator handles both directions at the four main slab rates: 5%, 12%, 18%, and 28%.
How it's calculated
Exclusive: GST = base × rate, total = base + GST. Inclusive: base = total ÷ (1 + rate), GST = total − base.
Common questions
- What are the GST rates in India?
- The main slabs are 5% (essentials), 12% (processed foods, some services), 18% (most goods and services), and 28% (luxury items). Some items are zero-rated or exempt.
- How do I calculate GST on an inclusive price?
- Divide the inclusive amount by (1 + rate/100) to get the base. The difference between inclusive price and base is the GST. Example: ₹1,180 inclusive at 18% → base ₹1,000, GST ₹180.