Definition
Quantity is the number of units of a product or service billed on an invoice line, such as 12 hours, 500 brochures, or 3 days. Quantity multiplied by unit price gives the line total. Always state the unit of measure so the client knows what the number refers to.
Quantity in practice
Fractional quantities are normal for time-based billing, for example 2.5 hours. Decide on your rounding rule (nearest 15 minutes, 6 minutes, or exact) and apply it consistently.
Frequently Asked Questions
How do I show quantity for a fixed-price service?
Use a quantity of 1 with the full price as the unit price, or describe the unit as "project" or "package". Either way, the line total equals the agreed fixed fee.