GST Calculator
Add or remove GST with CGST/SGST split and invoice preview.
Inputs
GST Amount
₹1,800
CGST
₹900
SGST
₹900
Net / Total
₹11,800
GST Split
- Base₹10,000(84.7%)
- CGST₹900(7.6%)
- SGST₹900(7.6%)
How this is calculated
GST = Amount × Rate%- 1Amount: ₹10,000, GST rate: 18%
- 2GST added: ₹1,800, total: ₹11,800
- 3CGST (half): ₹900, SGST (half): ₹900
Results are estimates for educational purposes only and are not financial, investment, tax, accounting, or legal advice. Always consult a qualified professional before making financial decisions.
By Vizo ToolLast updated August 20265 min read
GST Calculator — Add or Remove GST in Seconds
The GST Calculator makes Goods and Services Tax simple. Choose whether you're adding GST to a price or removing GST from an inclusive amount, pick any rate from 0.25% to 28%, and instantly see the GST amount split into CGST and SGST — or IGST for inter-state transactions.
Perfect for freelancers, small businesses, and shopkeepers preparing invoices or checking supplier quotes. It runs entirely in your browser, so no financial data ever leaves your device.
- Add or remove GST
- CGST / SGST / IGST split
- All GST slabs
- Invoice preview
- Free & private
Why Use GST Calculator?
Add or Remove GST
Switch between adding tax to a base price and extracting tax from an inclusive amount.
CGST / SGST / IGST Split
See the full intra-state split (half CGST, half SGST) or inter-state IGST automatically.
All Standard Slabs
0.25%, 3%, 5%, 12%, 18%, and 28% — every slab used in India's GST system.
Invoice-Ready Results
Copy the tax breakdown straight into your invoices or quotes.
Features
Dual Modes
Add GST to a net price or remove GST from a gross price with a single toggle.
Tax Split Cards
Dedicated cards show GST amount, CGST, SGST, and the net or total value.
All Slabs
A rate slider covers every standard slab including 0.25%, 3%, 5%, 12%, 18%, and 28%.
Copy Results
Copy the full breakdown as a neat summary for invoices or records.
Private by Design
All math happens locally — no account, no uploads, no tracking.
How to Use the GST Calculator
Work out GST in three quick steps.
Enter the amount
Type or slide the base price (to add GST) or the inclusive price (to remove GST).
Choose the GST rate
Pick the applicable slab — 0.25% to 28% — and set the mode to add or remove.
Read the breakdown
See the GST amount, CGST, SGST, and final net or total value, then copy it.
Frequently Asked Questions
Got questions? We've got answers.
How do I calculate GST?▼
To add GST: net × (1 + rate/100). To remove it: gross ÷ (1 + rate/100). The calculator does both instantly.
What is CGST and SGST?▼
For intra-state sales, GST is split equally — half as CGST (Central) and half as SGST (State). Inter-state sales attract full IGST instead.
What is IGST?▼
Integrated GST — the full tax collected on inter-state supplies. This calculator models the common intra-state case with a CGST/SGST split; for inter-state invoices, IGST is simply the full GST amount charged instead.
What are the GST slabs in India?▼
The main slabs are 0%, 0.25%, 3%, 5%, 12%, 18%, and 28%, depending on the goods or service.
How do I remove GST from an inclusive price?▼
Switch the mode to 'Remove GST' and enter the total you paid — the calculator extracts the tax and shows the base price.
What is the formula for adding GST?▼
Gross = Net × (1 + rate/100). For example, ₹10,000 at 18% GST becomes ₹11,800.
What is the formula for removing GST?▼
Net = Gross ÷ (1 + rate/100). For example, ₹11,800 inclusive of 18% has a base of ₹10,000.
Is the GST calculator free?▼
Yes, completely free with no sign-ups, no watermarks, and no limits.
Who should use this calculator?▼
Freelancers, small business owners, retailers, and accountants preparing invoices, quotes, or GST returns.
Does it handle 28% slab and lower slabs?▼
Yes — the rate slider covers every standard slab from 0.25% up to 28%, including decimals if needed.
Can I copy the results for an invoice?▼
Yes — one click copies the amount, GST, CGST, SGST, and total in a clean, invoice-friendly format.
Is GST the same in every country?▼
No — GST/VAT rates differ by country. This calculator follows India's GST structure with CGST/SGST/IGST splitting.
Are my amounts stored anywhere?▼
No. Everything is computed locally in your browser and never uploaded or saved.
What is the difference between GST inclusive and exclusive?▼
Inclusive means the price already contains tax; exclusive means tax is added on top. The mode toggle handles both.
Does it work on mobile?▼
Yes, fully responsive with touch-friendly controls for all devices.
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