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🧾 GST Calculator
Calculate GST or extract the base price from a GST-inclusive total. Add or remove GST, with CGST/SGST split and IGST support.
⚡ Instant calculation — no data is savedChoose a calculation
📊 Result
💡 Results update as soon as you change the amount or rate. See the formula below.
GST calculation
Add GST: GST = base amount × rate ÷ 100. Total = base amount + GST.
Remove GST: Base amount = inclusive total × 100 ÷ (100 + rate).
Intra-state transactions split GST into CGST and SGST. Inter-state transactions use IGST.
Frequently asked questions
How do I add GST?
Choose Add GST, enter the pre-tax amount, and select a rate. The calculator shows tax and total.
How do I remove GST from an inclusive price?
Choose Remove GST and enter the total price. The calculator estimates the base amount and GST.
What is the difference between CGST and IGST?
For intra-state sales, GST is split into CGST and SGST. Inter-state sales use IGST.
Can I enter a custom GST rate?
Yes. Select Custom and enter a rate from 0% to 100%.
Are my amounts stored?
No. The calculation runs locally in your browser.