How to use (3 steps)
- Decide whether your amount is GST-exclusive or GST-inclusive using the “Input is GST-inclusive” checkbox, then enter the amount in INR.
- Select a GST rate or type a custom rate, and adjust supply type (CGST+SGST or IGST) and rounding behaviour if needed.
- As you change any value, the base, GST amount, and total are recalculated instantly. Use “Copy URL” to share the same setup.
All calculations run only in your browser; amounts and settings are not sent to a server.
Net / gross definitions
- Net → Gross (exclusive input): tax = amount × (rate / 100), gross = amount + tax
- Gross → Net (inclusive input): base = gross ÷ (1 + rate / 100), tax = gross − base
Rounding uses your chosen mode (nearest / up / down). Display formatting follows Intl.NumberFormat('hi-IN') for INR.