Waste Factor Calculator

Overview

Adds the tool’s material-specific planning percentage to a raw quantity and shows both the extra amount and order quantity.

Assumptions

• Waste rates are default planning buffers, not supplier requirements.
• The base quantity is already in the unit selected for that material.

Worked example

With 100 pavers and a 10% rate, the order quantity is 100 × 1.10 = 110, so 10 extra are added.

Common mistakes

• Adding waste twice when another calculator already includes it.
• Using a percentage to compensate for an incorrect measurement.

Limitations

It cannot see pattern complexity, lot availability, or return policy.

Safety and local requirements

Store surplus materials safely; do not block walkways or overload vehicles with dense products.

Sources

• OSHA — Landscaping and Horticulture