Calculator
GST Calculator
GST (Goods and Services Tax) is the single indirect tax on most goods and services in India, charged at 5%, 12%, 18% or 28%. This calculator works both ways: add GST to a base price to find the total a customer pays, or strip GST out of an inclusive (MRP-style) amount to find the taxable value. It also breaks the tax down the way Indians actually use it — CGST + SGST (the two halves on a same-state sale) and IGST (the single tax on an other-state sale). Use it to set prices, raise invoices, or check a bill, and to see exactly how much tax sits inside any figure.
Base price (Add GST) or GST-inclusive total (Remove GST).
The slab that applies to your goods or service.
Add GST to a base price, or extract GST already inside a total.
Net value vs GST
- Net (taxable) value₹10,00085%
- GST₹1,80015%
You charge EITHER CGST + SGST (a same-state sale, GST split into two equal halves) OR a single IGST (an other-state sale) — never both at once. The result shows all three so you can copy the right pair onto your invoice. In a Union Territory the state half is UTGST instead of SGST (same amount). Rates and the slab applied to specific goods can change; confirm the current HSN/SAC rate before invoicing.
What your result means
- GST is a tax on value added at each stage — you charge it on sales (output) and reclaim what you paid on purchases (input tax credit), so you only really remit the difference.
- Charge CGST + SGST for sales within your state and IGST for inter-state sales — the total rate is the same, only the split differs.
- Use exclusive mode when adding GST to your price, and inclusive mode to back out the tax already inside a quoted price.
How to use this calculator
- Enter the amount — your base price if adding GST, or the all-inclusive total if removing it.
- Pick the GST slab that applies to your product or service: 5%, 12%, 18% or 28%.
- Choose “Add GST” to mark up a base price, or “Remove GST” to find the tax inside a total.
- Read the GST amount, then the net (taxable) and gross (inclusive) figures.
- On a same-state invoice use the CGST + SGST halves; on an other-state invoice use the single IGST figure instead.
The formula
Add GST: GST = base × rate ÷ 100; total = base + GST. Remove GST (amount is inclusive): taxable value = amount × 100 ÷ (100 + rate); GST = amount − taxable value. In both cases, for an intra-state sale CGST = SGST = GST ÷ 2.
Worked example
A service billed at a base of ₹10,000 at the 18% slab: GST = 10,000 × 18 ÷ 100 = ₹1,800, so the customer pays ₹11,800. Split: CGST ₹900 + SGST ₹900. Now reverse it — if a bill shows ₹11,800 inclusive at 18%, taxable value = 11,800 × 100 ÷ 118 = ₹10,000 and the GST inside is ₹1,800. The two views always reconcile to the same ₹1,800 of tax.
When to use it
- Setting a customer-facing price once you know your base rate and slab.
- Raising a GST invoice with the correct taxable value and tax split.
- Back-calculating the taxable value from a GST-inclusive MRP or quote.
- Checking that the GST charged on a supplier bill matches the slab.