GST Calculator

Add your amount and GST rate. Get CGST, SGST, or IGST breakdown instantly.

Use this calculator to quickly work out GST on your sales or purchases. Common rates are 0%, 5%, 6%, 9%, 12%, 14%, 18%, 28% as per CBIC. Intra-state = same state (CGST+SGST). Inter-state = different state (IGST).

Rates based on CBIC. May change. Verify with official sources.

How to use

  1. Select mode: add GST to amount (forward) or extract amount from total (reverse).
  2. Enter amount in rupees. For reverse mode, enter the total including GST.
  3. Choose intra-state (CGST+SGST) or inter-state (IGST).
  4. Select GST rate. Common: 0% (essential items), 5% (packaged food), 12%, 18% (most goods).

Formula

GST = Amount × (Rate ÷ 100). Total = Amount + GST. Reverse: Base = Total ÷ (1 + Rate/100)

Rates as per CBIC: 0%, 5%, 12%, 18%, 28%. Intra-state uses CGST+SGST (half each).

Related articles

FAQs

How to calculate GST on amount?
GST = Amount × (Rate ÷ 100). Example: ₹10,000 at 18% = ₹1,800 GST. Total = ₹11,800.
What is CGST and SGST?
For intra-state (same state) sales, GST is split: CGST (Central) + SGST (State), each half the total rate. E.g. 18% = 9% CGST + 9% SGST.
When to use IGST?
IGST applies to inter-state (different state) sales. One unified rate goes to Centre. Use IGST when buyer and seller are in different states.
How to reverse calculate GST from total?
Base amount = Total ÷ (1 + Rate/100). GST = Total − Base. Example: ₹11,800 total at 18% → Base ₹10,000, GST ₹1,800.

Embed this calculator

Add this GST Calculator to your blog or website. Copy the code below:

<iframe src="https://stockkeeper.in/tools/gst-calculator?embed=1" width="400" height="480" loading="lazy" title="GST Calculator"></iframe>

Adjust width and height as needed. Free to embed with link back to Stockkeeper.

Contractor? For construction-specific tools—labour cost estimator, building material GST, TDS 194C—see Yojo's 50+ construction calculators.

Track stock and bill with GST

Stockkeeper helps kirana stores generate GST-compliant invoices from your phone. No accounting complexity—just stock and billing.

Join the waitlist