Calqpro

Invoice Calculator

Add line items, tax rate, and discount to calculate full invoice total.

Build an invoice calculation with multiple line items, optional discount (percentage or flat), and sales tax. Instantly see subtotal, discount amount, taxable amount, tax, and total due. Perfect for freelancers, contractors, and small businesses.

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Last reviewed: April 2026Report an error

DescriptionQtyUnit $Total
$300.00
$300.00

Invoice Total

$651.00

Subtotal: $600.00 + $51.00 tax = $651.00.

Subtotal

$600.00

Discount

−$0.00

Tax

$51.00

Total Due

$651.00

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How to Use This Invoice Calculator

  1. Add your line items with description, quantity, and unit price.
  2. Enter sales tax rate (if applicable).
  3. Enter any discount (flat dollar or percentage).
  4. Read subtotal, discount, tax, and total amount due.

Frequently Asked Questions

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