Number Tools
GST Calculator — Inclusive & Exclusive Tax Amounts
Calculate GST for India: add tax to a base price or extract GST from an inclusive amount. Supports 5%, 12%, 18%, 28% slabs. Free online.
GST Calculator on FYN Tools is a free Number Tools utility. Open GST Calculator in your browser — no signup required. Pick GST rate and enter either pre-tax or tax-inclusive amount to get CGST/SGST split, net price, and gross total — instant browser math. Related: Simple Calculator.
Privacy & processing: Calculations run locally in your browser. Results are planning estimates — verify with your bank, CA, or advisor.
TL;DR: Pick GST rate and enter either pre-tax or tax-inclusive amount to get CGST/SGST split, net price, and gross total — instant browser math.
Reviewed by FYN Tools Editorial · Guides ·
Data input / output
| Inputs | Amount (₹), GST rate (5/12/18/28% or custom), mode: add GST or remove GST from inclusive price |
|---|---|
| Outputs | Base amount, GST amount, CGST, SGST, total |
| Formats | INR; percentage rate |
| Limits | Simple slab calculator — not for compound invoices or multi-line returns filing |
| Processing | Client-side (browser) |
How to Use the GST Calculator
- Enter the base amount or GST-inclusive price
- Select the applicable GST rate (5%, 12%, 18%, 28%)
- Choose calculation type: GST exclusive or inclusive
- View calculated GST amount and total price
- Use results for invoicing and tax planning
What is a GST Calculator?
GST Calculator: Adds or removes Indian GST (5/12/18/28%) from an amount.
Inputs: Base or inclusive amount + slab. Outputs: GST amount and exclusive/inclusive totals. Mistake to avoid: applying 18% when the HSN is 5% — pick the slab that matches the invoice, not a default.
GST Calculator: Adds or removes Indian GST (5/12/18/28%) from an amount.
How it works
You set base or inclusive amount + slab in the live panel. GST Calculator then adds or removes Indian GST (5/12/18/28%) from an amount. Results show as gst amount and exclusive/inclusive totals.
Explore more tools on our site.
Usage scenarios
- Invoice GST exclusive: Enter the taxable value, pick 18%, and copy CGST/SGST split for an intra-state invoice.
- Price already includes GST: Switch to inclusive mode so you can back out the base amount from an MRP.
- IGST for interstate: Use the IGST view when the supply is across state lines.
Input / Output Examples
Input
₹10,000 exclusive · 18%
Output
GST ₹1,800 · Total ₹11,800 · CGST/SGST split
Input
Inclusive ₹1,180 · 18%
Output
Base ≈ ₹1,000 · GST ≈ ₹180
Frequently Asked Questions
What are the current GST rates in India?+
GST rates in India are 5%, 12%, 18%, and 28% depending on the goods or services. Essential items may be exempt (0%) or have special rates.
What's the difference between CGST, SGST, and IGST?+
CGST (Central GST) and SGST (State GST) apply to intra-state transactions, while IGST (Integrated GST) applies to inter-state transactions. The total rate remains the same.
How do I calculate reverse GST?+
Reverse GST calculation finds the base amount from GST-inclusive price. Formula: Base Amount = GST Inclusive Amount / (1 + GST Rate/100).
Can I use this for business invoicing?+
Yes, this calculator helps create accurate invoices by calculating GST amounts, but ensure you comply with all GST regulations and use proper invoicing software for business.
Key Features
- GST calculation
- Multiple GST rates
- Add GST
- Remove GST
- GST inclusive price
- GST exclusive price
- Tax amount display
- Total amount display
Benefits
GST Calculator runs without installing desktop software
Accepts: Base or inclusive amount + slab
Returns: GST amount and exclusive/inclusive totals
When to Use GST Calculator
- When you need adds or removes Indian GST (5/12/18/28%) from an amount. without another app
- When your input looks like: Base or inclusive amount + slab
Advantages
- GST Calculator runs without installing desktop software
- Accepts: Base or inclusive amount + slab
- Returns: GST amount and exclusive/inclusive totals
- How-to and FAQs for GST Calculator live on the same page
Tips
- Read the Privacy & processing note before you paste secrets.
- Applying 18% when the HSN is 5% — pick the slab that matches the invoice, not a default.
- Copy GST Calculator output immediately if you will close the tab.
Common Mistakes
Applying 18% when the HSN is 5% — pick the slab that matches the invoice, not a default.
Treating one run as final without checking units or a second sample.
Ignoring related tools when the next step is resize, compress, or convert.
Summary
Use GST Calculator on this page, then browse related number tools linked below.