How to Calculate GST in India (2026)

GST calculation is simple using a formula.

GST Formula

GST = (Amount × Rate) ÷ 100

Example

₹2000 at 18% GST:

GST = ₹360

Total = ₹2360

Inclusive GST

GST = Amount - (Amount × 100 / (100 + rate))

Conclusion

Use a calculator for quick results.