Invoice Total Calculator
Calculate an invoice's subtotal, discount, tax, and grand total from itemized line items, without generating a document.
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$
%
%
| Description | Qty | Unit Price | Line Total |
|---|---|---|---|
| Consulting hours | 10 | $100.00 | $1,000.00 |
| Software license | 1 | $250.00 | $250.00 |
Subtotal
$1,250.00
Discount
−$0.00
Tax
$100.00
Total
$1,350.00
How to Use the Invoice Total Calculator
An invoice total is built from line items, an optional discount, and tax applied on top. List each line item's description, quantity, and unit price, choose whether your discount is a percentage or a fixed dollar amount, and set your tax rate. The calculator totals every line, applies the discount to the subtotal, then applies tax to the discounted amount.
Line Total = Qty × Unit Price
Subtotal = Sum of Line Totals
Tax = (Subtotal − Discount) × Tax Rate
Total = Subtotal − Discount + Tax
Subtotal = Sum of Line Totals
Tax = (Subtotal − Discount) × Tax Rate
Total = Subtotal − Discount + Tax
Example
An invoice with 10 hours of consulting at $100/hour ($1,000) plus a $250 software license comes to a $1,250 subtotal. With no discount and an 8% tax rate, tax is $100, bringing the total to $1,350.
Common Use Cases
- Working out an invoice's subtotal, discount, tax, and grand total before sending it to a client.
- Double-checking the math on an invoice you received to confirm the totals are correct.
- Comparing how a percentage discount versus a fixed dollar discount changes the final total.
FAQs
- How is this different from the site's PDF invoice generator? The PDF invoice generator tool produces an actual downloadable, formatted PDF document you can send to a client. This calculator is just the underlying math — subtotal, discount, tax, and total — with no document or PDF output, useful for a quick check without generating a full invoice file.
- Is the discount applied before or after tax? Before — this calculator applies the discount to the subtotal first, then calculates tax on the discounted amount, which matches how most invoices and point-of-sale systems apply discounts and tax.
- Can I use a fixed dollar discount larger than the subtotal? The discount is capped at the subtotal amount, so the discounted total never goes below $0 before tax is applied.