GST Calculator
Add or remove GST from any amount, with CGST/SGST and IGST breakdown for India GST rates.
How to Use
- Choose "Add GST" to calculate a GST-inclusive total from a base amount, or "Remove GST" to back-calculate the base amount from a GST-inclusive price.
- Enter the amount and select the applicable GST rate.
- Choose "Intra-state" to see the CGST + SGST split, or "Inter-state" to see the IGST amount.
- Results update instantly as you type.
When to Use This
- Pricing a quote where the client expects a round tax-inclusive figure, using add mode to work back to the taxable value you must show.
- Reconstructing the taxable amount from a receipt that prints only the total, which is exactly what the remove mode is for.
- Checking whether a supplier's invoice split the tax correctly into CGST plus SGST for a supply made within your own state.
- Explaining to a customer why an inter-state invoice carries a single IGST line instead of the two tax lines they usually see.
Frequently Asked Questions
About This Calculator
Adding GST and removing it are not mirror images of the same arithmetic. Adding is a multiplication: base times rate divided by 100. Removing it from a tax-inclusive total is a division by (1 + rate/100), because the tax was charged on the base and not on the total. Subtracting 18 percent from an inclusive price gives the wrong base, and that error grows with the rate.
Pick a rate from the six slabs offered, 0.25, 3, 5, 12, 18 and 28 percent, then choose add or remove, and intra-state or inter-state. Intra-state shows CGST and SGST as exactly half the computed tax each, with each label carrying half the rate; inter-state shows the whole figure on a single IGST line. Amounts print in rupees to two decimal places, and the calculation runs in your browser as you type.
Notes & Limits
- India's GST only. The rate list covers 0.25, 3, 5, 12, 18 and 28 percent, with no nil-rated, exempt or composition-scheme option.
- Compensation cess, reverse charge, TDS and TCS under GST, and any item-specific or state-specific exemption fall outside what this calculates.
- CGST and SGST are each half the tax rounded to two decimals for display, so the two halves can add up to one paisa away from the total shown.
- Treat the output as an estimate for one amount at one rate. A multi-line invoice, or a filing figure, belongs in accounting software or on the GST portal.