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.
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 ·
Privacy & processing: Calculations run locally in your browser. Results are planning estimates — verify with your bank, CA, or advisor.
GST Calculator
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.
- 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
- Processing
- Client-side (browser)
- Limits
- Simple slab calculator — not for compound invoices or multi-line returns filing
Quick steps
- 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
- GST calculation
- Multiple GST rates
- Add GST
- Remove GST
- GST inclusive price
- GST exclusive price
- Tax amount display
- Total amount display
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 on FYN Tools calculate GST (Goods and Services Tax). Use the tool above — free, no account required.
Change loan amount, rate, tenure, or tax inputs to compare scenarios before you commit elsewhere.
Calculate GST (Goods and Services Tax).
How it works
GST Calculator runs the formulas or conversions in the form and displays results immediately.
Explore more tools on our site.
Common Use Cases & Examples
- Number workflow: Calculate GST (Goods and Services Tax).
- Quick browser check: Use GST Calculator once, then continue in your doc or app.
Input / Output Examples
Input
Date A: Jan 1, 2024 | Date B: Mar 15, 2025
Output
Duration: 439 days
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
Free access with no signup for core features
Fast browser-based processing
Mobile-friendly layout
When to Use GST Calculator
- When comparing loan, tax, or investment numbers before signing paperwork
- Before a budget review or tax filing — copy the breakdown from GST Calculator
- On mobile when you need a quick calculator without a spreadsheet
Advantages
- Free access with no signup for core features
- Fast browser-based processing
- Mobile-friendly layout
- Clear how-to steps and FAQs on the same page
Tips
- Double-check units (currency, dates, measurements) before acting on results.
- Use a modern browser for best performance with canvas and file uploads.
- Save or screenshot important outputs before closing the tab.
Common Mistakes
Confusing annual vs monthly rate when entering loan or investment fields
Treating rounded calculator output as a bank-approved quote
Forgetting that tax and fee line items are excluded from simple calculators
Summary
Use GST Calculator above, then browse related number tools linked below.