GST Calculator (All-in-One)
Calculate CGST, SGST, IGST breakdown. Reverse GST calculation, composition scheme comparison, and HSN/SAC code quick-lookup — all in one tool.
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Not sure about rates? Learn how to claim your input tax credit correctly to offset GST paid on purchases.
How to Use the GST Calculator
Our all-in-one GST Calculator helps businesses, freelancers, and accountants calculate Goods and Services Tax instantly. Choose between adding GST (forward calculation) or removing GST (reverse calculation) from any amount. If you're new to GST, start with our complete guide to GST registration.
Forward vs Reverse GST
Forward GST: When you know the base price and want to find the total including GST. Reverse GST: When you have the GST-inclusive price and need the base taxable amount. See our step-by-step GST return filing guide.
CGST + SGST vs IGST
For intra-state transactions (same state), GST splits equally into CGST and SGST. For inter-state transactions, the entire GST is collected as IGST (Integrated GST).
GST Rate Slabs in India (2025)
When to Use This Calculator
Use our GST calculator for invoicing, generating quotations, reverse-calculating pre-GST costs from bills, and verifying GST amounts on purchases. Ideal for small businesses, CAs, and freelancers.
📚 Further Reading & Related Resources
❓ Frequently Asked Questions
Yes, businesses with turnover up to ₹1.5 crore (₹75 lakh for special category states) can opt for the Composition Scheme, which charges a flat 1-5% tax with simplified quarterly returns. Read our guide on GST composition scheme eligibility and benefits.
Use the Reverse GST mode in our calculator. Formula: Base Price = Total Price × (100 ÷ (100 + GST%)). For example, if the GST-inclusive price is ₹1,180 at 18%, the base price is ₹1,000 and GST is ₹180.
CGST (Central GST) and SGST (State GST) apply equally on intra-state transactions. IGST (Integrated GST) applies on inter-state transactions and is equal to CGST + SGST. The total tax rate remains the same regardless of transaction type.
Exports are treated as zero-rated supply under GST. You can either export without payment of IGST (under bond/LUT) and claim ITC refund, or pay IGST and claim refund of the tax paid. Most exporters prefer the LUT route.
GST on services follows the same calculation as goods. Most professional services (IT, consulting, legal) attract 18% GST. Restaurant services are taxed at 5% (no ITC) or 18% (with ITC for AC restaurants). Use our SAC code finder to look up the exact rate for your service category.
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Need Professional Help?
Our Chartered Accountants can handle all your compliance needs — from filing to advisory.