GST Calculator
Calculate GST inclusive and exclusive amounts
What is GST Calculator?
GST Calculator is a free business tool from Farvixo that lets you calculate GST inclusive and exclusive amounts. Your business and client details stay in your browser and are never uploaded. The exported document carries no watermark and no branding of ours, so it can be sent to a client exactly as generated.
How to use GST Calculator
Fill in your business information in GST Calculator. Everything stays in your browser.
Pick a template and adjust colours, fonts and layout until it matches your brand. The preview updates as you edit.
Export a print-ready file. No watermark and no subscription — GST Calculator is free to use as often as you need.
Frequently Asked Questions
How do I remove GST from an inclusive price?
Divide, do not subtract. At 18%, divide the gross by 1.18 to get the net. Subtracting 18% from the gross gives a different and incorrect figure — this is the single most common GST mistake.
What is the CGST and SGST split?
For a sale within a state, the total GST is divided equally between central and state GST — 18% becomes 9% CGST and 9% SGST. For an inter-state sale it is a single IGST of the full 18% instead.
Which GST rate applies to my product?
Rates are set per category — commonly 0%, 5%, 12%, 18% or 28%. Only the official HSN or SAC classification for your goods or services determines it. Check the current schedule rather than assuming; rates do change.
Are my figures stored?
No. Everything is calculated in your browser and nothing is transmitted or saved.
What is the difference between IGST and CGST/SGST?
IGST applies to inter-state supply and is a single tax collected centrally. Within a state, the same total splits equally into CGST and SGST. The rate is identical; only the split differs.
What you can use GST Calculator for
- Freelancers issuing an invoice without paying for accounting software
- Small businesses producing a quotation or receipt on short notice
- Anyone who needs a professional document once, not a monthly subscription
- Keeping client financial details off third-party servers
GST Calculator at a glance
- Tool
- GST Calculator — Business Tools
- Purpose
- Calculate GST inclusive and exclusive amounts
- Input
- Text or values you enter directly
- Output
- A print-ready PDF or document with no watermark
- Processing
- In your browser — files are never uploaded to a server
- Price
- Free, unlimited, no account required
- Limitations
- Bounded by your device's memory and CPU rather than a server quota
Tips for better results
- Use a consistent numbering sequence across documents — it matters for bookkeeping and for tax filing later.
- Check the tax fields against the rules where you operate; the calculation is only as right as the rate you enter.
- Keep a copy of every document you issue. Nothing is stored here, so the download is your only record.
Common problems and how to fix them
Totals do not add up as expected
Check whether the tax rate should apply per line or to the subtotal, and whether entered prices already include tax.
The logo looks blurry in the PDF
Upload a higher-resolution image. A small web logo scaled up for print will always soften.
Text overflows the layout
A field is longer than the template allows. Shorten the description or move the detail to a notes line.
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