GST Calculator
Add GST to a taxable amount, or extract GST from an inclusive price, with the CGST and SGST split.
How the GST Calculator works
Add GST to a taxable amount, or extract GST from an inclusive price, with the CGST and SGST split. Below is the exact mathematical or algorithmic model used by this tax & billing utility, along with its key operating assumptions.
Exclusive: GST = taxable value × rate, total = taxable value + GST. Inclusive: taxable value = amount × 100 ÷ (100 + rate), GST = amount − taxable value.Step-by-step workflow
- Enter your dates, values, or measurement units into the GST Calculator fields.
- The utility engine computes Exclusive: GST = taxable value × rate, total = taxable value + GST. Inclusive: taxable value = amount × 100 ÷ (100 + rate), GST = amount − taxable value. instantaneously with exact calendar and decimal precision.
- Review the primary result alongside secondary unit conversions or per-person splits and share the scenario URL if needed.
Worked example & key advantages
For ₹1,000 at 18% GST, tax is ₹180 and the invoice total is ₹1,180. Working backwards, a ₹1,180 GST-inclusive price has a taxable value of ₹1,000 and ₹90 each of CGST and SGST.
Why use this GST tool
- Handles leap years, variable month lengths, overnight shifts, stacked retail discounts, and intra-state CGST/SGST splits accurately.
- Includes Indian land and weight units (Sq.Ft, Gaj/Sq.Yard, Guntha, Acre, Hectare, Quintal) alongside SI metric units.
- Shareable scenario links let you send exact calculations to colleagues, clients, or family members.
Important Assumptions & Scope
- The GST rate is entered by the user and should be verified for the item or service.
- CGST and SGST are shown as an equal split for intra-state estimates.
- For inter-state supply, IGST may apply instead.
- Cess and special cases are excluded.
Frequently Asked Questions — GST
Clear answers to common questions about methodology, edge cases, and privacy.
Does this choose the correct GST rate?
No. It performs the arithmetic after you enter the rate.
Why show CGST and SGST?
For many intra-state invoices, GST is split equally between CGST and SGST.
Can I remove GST from an inclusive price?
Yes. Set "Amount entered is" to GST inclusive and the calculator extracts the taxable value and the GST portion.