Invoice Calculator — Free Online Calculator
Invoice totals. Free invoice calculator with instant results.
Last updated: 2026-06-01
Add line items, apply discounts and tax, and track payments to calculate your invoice total.
Line Items
Description
Qty
Price
Total
$
$2,500.00
$
$500.00
$
$348.00
$
Invoice Summary
Subtotal$3,348.00
Discount (10%)-$334.80
Total$3,013.20
Amount Due$3,013.20
Invoice Best Practices
Include Clear Details
Itemize services, include dates, and be specific about deliverables to avoid disputes.
Set Payment Terms
Clearly state due date (Net 15, Net 30), accepted payment methods, and late fees.
Number Sequentially
Use a consistent invoice numbering system for easy tracking and accounting.
Include Contact Info
Make it easy for clients to reach you with questions about the invoice.
Track Your Business Performance
Calculate ROI on your investments and marketing campaigns.
Results are estimates for planning purposes only. Verify important financial or health decisions with a qualified professional.