Free Online India GST Calculator - Indian Rupees (₹)
Calculate India Goods and Services Tax (GST) instantly for corporate invoices, consumer purchases, purchase orders, or accounting entries. Our calculator operates entirely inside your local browser using client-side JavaScript, ensuring total confidentiality for your corporate accounts and business calculations.
Indian GST Slabs Reference
India implements a multi-tiered consumption tax system managed by the GST Council. The primary slabs are:
- 5% Slab: Applies to household essentials like sugar, tea, spices, life-saving medicines, and simple textiles.
- 12% Slab: Applies to business diaries, writing instruments, processed foods, fruit juices, and basic computers.
- 18% Slab: The most common standard slab. Applies to software services, professional consulting, construction, electronics, and restaurant bills.
- 28% Slab: Applies to luxury and luxury items, such as luxury automobiles, motorcycles, carbonated drinks, and high-end hotel services.
CGST, SGST, and IGST Splitting Rules
When you conduct transactions in India, the GST structure is categorized based on the destination of the goods/services:
- Intra-state Transactions (Same State): The GST is split equally into CGST (Central GST) and SGST (State GST). For example, on a standard 18% slab, 9% is allocated to CGST and 9% to SGST.
- Inter-state Transactions (Different States): The entire rate is charged as IGST (Integrated GST) and goes to the Central Government. For example, the full 18% is allocated to IGST.
How to Add or Remove Indian GST manually
To calculate Indian GST or extract pre-tax values manually:
- Adding 18% GST: Multiply the net amount by 1.18 (e.g., ₹1,000.00 * 1.18 = ₹1,180.00 gross).
- Removing 18% GST: Divide the gross amount by 1.18 (e.g., ₹1,180.00 / 1.18 = ₹1,000.00 net). The GST portion is the difference (₹180.00), which splits into CGST (₹90.00) and SGST (₹90.00) if local.
- Adding 28% GST: Multiply the net amount by 1.28.
- Removing 28% GST: Divide the gross amount by 1.28.
How to Use This Calculator
- Enter your pre-tax or post-tax amount in Amount (INR ₹).
- Set the Tax Rate (%) to 18 for standard services, or 5, 12, or 28 depending on your product slab.
- Click Add Tax to calculate the gross total from a net price.
- Click Remove Tax to extract the original pre-tax net amount from a gross price.
- View the instant result showing net price, tax amount, and gross total. For intra-state splits, simply divide the resulting tax amount by two for CGST and SGST.
Privacy
All calculations happen entirely in your local browser sandbox. No financial data, purchase totals, or invoice details are transmitted to any server, making this safe for corporate financial planning and bookkeeping.
Source and Accuracy Notes
Last reviewed: July 2026. Indian GST classification depends on product or service category, place of supply, registration status, notifications, and rate changes. Confirm current slab treatment with official GST resources such as the CBIC GST rates page or a qualified tax professional.
Business Disclaimer
This calculator estimates net, tax, and gross arithmetic. It does not determine HSN/SAC classification, place of supply, input tax credit, compliance filing, e-invoicing, or official GST treatment.