How it works
Effective unit cost = total cost ÷ usable units ÷ (1 − loss rate).
Input definitions
- Total relevant cost
- Enter the value in the labeled unit.
- Usable units, visits or hours
- Enter the value in the labeled unit.
- Loss, waste or unused share (%)
- Enter the value in the labeled unit.
A worked example
- Total relevant cost
- 1200
- Usable units, visits or hours
- 40
- Loss, waste or unused share (%)
- 10
Assumptions & limits
A planning estimate based only on the values entered. It does not fetch current prices, taxes, tariffs, eligibility rules or quotes. Use consistent units and verify material decisions against current documents.
Sources & review
Maintained by AnsRio. Methods and examples use automated checks; this does not imply independent professional certification.
Method updated 2026-11-01. Content checked against the stated method and examples. Our verification approach.
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Common questions
Why account for unused or lost units?
The heating degree day cost estimate spreads cost across the units that actually deliver value, rather than the headline quantity.
How does Heating degree day cost work?
Effective unit cost = total cost ÷ usable units ÷ (1 − loss rate).
What should I check before relying on Heating degree day cost?
A planning estimate based only on the values entered. It does not fetch current prices, taxes, tariffs, eligibility rules or quotes. Use consistent units and verify material decisions against current documents.