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Quickly calculate GST for Indian invoices. Use this for 5%, 12%, and 18% GST rates, then move to our invoice tool to generate a full PDF bill.
Enter amount, select GST rate and type — results update instantly.
Taxable Value
Total GST
CGST (%)
SGST (%)
CGST + SGST applies for intrastate supply. For interstate supply, IGST = total GST amount above.
GST is a tax on supply of goods and services in India. Common slabs include 5%, 12%, and 18%. Correct calculation helps avoid underbilling and return mismatches.
GST = taxable value x rate / 100
Final value = taxable value + GST
Taxable value = gross amount / (1 + rate)
GST = gross amount - taxable value
Base value is Rs 10,000 with 18% GST. GST is Rs 1,800. Final amount is Rs 11,800.
Final amount is Rs 11,800 with 18% GST included. Taxable value is Rs 10,000 and GST is Rs 1,800.
Multiply taxable value with GST rate for exclusive GST, or divide total amount by 1 plus GST rate for inclusive GST.
GST = amount x 18 / 100. Final amount = base amount + GST.
Yes, the same formula works for 5%, 12%, and 18% rates by changing only the percentage.
Yes, after checking tax amount you can create GST invoice online in our invoice generator.
Use our invoice tool to auto-fill tax details and download a professional GST invoice PDF.
Useful links: create GST invoice online, GST calculator, GST invoice format.