How to Use This GST Calculator
Use this free India GST calculator to compute tax on invoices, quotations, and purchases. Select Exclude GST when the price is before tax, or Include GST when you need to reverse-calculate the taxable value from a GST-inclusive total.
- Enter the amount in rupees.
- Select the GST rate (5%, 12%, 18%, 28%, or custom).
- Choose inclusive or exclusive mode and view CGST/SGST split instantly.
GST Calculation Formulas
GST Exclusive (Add Tax)
GST Amount = Base × Rate ÷ 100
Total = Base + GST Amount
Example: ₹1,000 + 18% = ₹180 GST → Total ₹1,180
GST Inclusive (Reverse)
Base = Total × 100 ÷ (100 + Rate)
GST Amount = Total − Base
Example: ₹1,180 incl. 18% → Base ₹1,000, GST ₹180
Standard GST Slabs in India
| GST Rate | Common Categories |
|---|---|
| 0% | Essential food grains, fresh milk, education services |
| 5% | Household necessities, packaged food items |
| 12% | Processed foods, business services |
| 18% | Electronics, IT hardware, most commercial goods |
| 28% | Luxury items, automobiles, sin goods |
GST Calculator — Frequently Asked Questions
How do I calculate GST on an amount excluding tax?
Multiply the base amount by the GST rate and divide by 100. For example, GST on ₹1,000 at 18% is ₹180, making the total ₹1,180.
How do I find the base amount from a GST inclusive price?
Divide the inclusive amount by (1 + GST rate ÷ 100). For ₹1,180 at 18% GST, base amount = 1180 ÷ 1.18 = ₹1,000.
What is the difference between CGST and SGST?
For intra-state supplies in India, GST is split equally into CGST (Central GST) and SGST (State GST). Each component is 50% of the total GST.
What are the standard GST rates in India?
Common GST slabs are 0%, 5%, 12%, 18%, and 28%. Some goods and services may have exemptions or special rates under Indian tax law.
Is this GST calculator free to use?
Yes. The TRULINK GST calculator is completely free, works in your browser, and requires no registration.
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