GST Calculator
Add or remove GST from an amount. Intra-state splits CGST and SGST; inter-state uses IGST. Presets are common slabs, not live law.
GST rate (common presets)
Online GST Calculator
Looking for a GST calculator, CGST/SGST split, or GST inclusive tool? Toolshelf adds or removes GST from an amount in your browser — with intra-state or inter-state split, no signup, and no uploads. This is not a GST return and not an invoice PDF.
What you can do
- Add GST to a net amount or remove GST from a tax-in price
- Intra-state CGST + SGST split, or inter-state IGST
- Common slab presets plus a custom rate
- Copy a net / GST / gross breakdown
- Draft stays in this browser — nothing is uploaded
Frequently asked questions
- What is a GST calculator?
- A GST calculator turns a taxable amount and a GST rate into net, GST, and gross. This page also splits GST into CGST and SGST for intra-state supply, or IGST for inter-state supply.
- What is exclusive vs inclusive GST?
- Exclusive (add GST): GST = net × rate ÷ 100, gross = net + GST. Inclusive (remove GST): net = gross ÷ (1 + rate ÷ 100), GST = gross − net. Amounts are rounded to 2 decimal places (half-up).
- How do CGST, SGST, and IGST split?
- Intra-state: GST is split equally into CGST and SGST. If GST is an odd paise, SGST receives the extra 0.01 — the same splitGst helper as Invoice Generator. Inter-state: the full GST amount is IGST; CGST and SGST are 0.
- Are the 0%, 5%, 12%, 18%, 28% chips current law?
- They are common presets, not a live CBIC feed. Slabs change. Always use a custom rate when you know the HSN/SAC rate, including 12.5% or 0%.
- Is this an invoice or a GST return?
- No. This tool does not create a PDF invoice, validate GSTIN as its job, or file GSTR. For a bill, use Invoice Generator. Toolshelf does not file GST.
- Does my amount leave the browser?
- No. Math is local. A draft can stay in this browser’s local storage so refresh does not wipe the job.
Examples
Add 18% GST
Exclusive 1,000 at 18% intra-state is net 1,000, GST 180, CGST 90, SGST 90, gross 1,180.
Remove GST from a tax-in price
Inclusive 1,180 at 18% returns net 1,000. Inter-state shows IGST 180 instead of CGST/SGST.
Limitations
- Planning helper — not a GST return, GSTIN validator, or live CBIC rate feed.
- Presets are common slabs, not current law.
- Does not create a PDF invoice; use Invoice Generator for that.
What would you like to do next?
Continue working with the next step in this workflow. Recently used tools in this set are listed first.
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