GST Invoice Calculator
Build the numbers for a GST invoice or quotation line by line. Copy the totals into your billing software or use our invoice templates.
Private: your numbers stay on your device.Calculated in your browser. The amounts you enter are never sent to us or stored.
Quick answer
For each line, taxable value = quantity × rate − discount; GST = taxable value × GST%. The invoice total is the sum of taxable values plus the sum of GST, split into CGST + SGST for intra-state or IGST for inter-state supply.
How to use the GST Invoice Calculator
- Add a row for each item: description, quantity, rate, discount %, GST %.
- Choose intra-state or inter-state.
- Read the per-line and total tax breakup.
Worked example
10 units at ₹250 with 18% GST: taxable ₹2,500, GST ₹450, total ₹2,950.
Formula
Line taxable = Qty × Rate × (1 − Disc ÷ 100) Line GST = Line taxable × GST ÷ 100
Frequently asked questions
Is round-off allowed on a GST invoice?
Yes, rounding the invoice total to the nearest rupee is common practice; show the round-off amount as a separate line.
Related tools
- GST Calculator (India)Add or remove GST at 5%, 18% or 40% (GST 2.0) and see the…
- Discount CalculatorFind the sale price and savings after a percentage discount, including successive discounts like…
- TDS Deduction Calculator (FY 2026-27)TDS on contractor, professional fees, rent, commission and interest for FY 2026-27, with thresholds,…
More Business Calculators
- Profit Margin Calculator Calculate gross margin, markup and profit from cost and selling price, or find the selling price…
- Profit and Loss Calculator Find profit or loss and the profit/loss percentage from cost price and selling price. Includes the…
- Break-Even Point Calculator Find how many units you must sell to cover fixed costs, and the break-even revenue, from…
- eCommerce Product Profit Calculator Work out net profit per order after marketplace commission, fixed fee, shipping, packaging, ads, returns and…
- Amount in Words – Rupees to Words Converter Convert any amount into words in the Indian system (lakh, crore) with paise, e.g. ₹1,25,000 =…
- UPI MDR Calculator Work out the new UPI merchant charge from 15 October 2026: 0.4% on payments above ₹2,000,…