Add line items with quantity and rate, apply a discount and tax rate, and instantly get your invoice subtotal, discount, tax, and grand total.
Line Items
How to Use the Invoice Calculator
Fill in a "Description", "Quantity", and "Rate (₹)" for each line item.
Use "Add Line Item" to add more rows, or the × button to remove one.
Enter an optional "Discount (%)" and the applicable "Tax / GST (%)".
Click "Calculate Invoice" to see each line total plus the subtotal, discount, tax, and grand total.
Frequently Asked Questions
The discount is applied first to the subtotal to get the taxable amount, and then tax is calculated on that discounted amount - the same order most invoices follow.
Yes, enter your applicable GST rate (e.g. 18%) in the "Tax / GST" field. Note that this calculator shows a single combined tax amount rather than splitting it into CGST/SGST or IGST - use the GST Calculator if you need that breakdown.
Yes, both fields default to treating a blank or zero value as no discount or no tax applied.
Yes, it's completely free and requires no sign-up.