The calculation, explained.
Subtotal = materials + labour + allowance. Contingency applies to that subtotal. Tax applies to materials only. Total = subtotal + contingency + materials tax.
Review the example assumptions and results
- Materials
- 1000 $
- Labor
- 500 $
- Allowance
- 100 $
- Contingency on subtotal
- 10 %
- Tax on materials
- 8 %
- Subtotal
- 1600 $
- Contingency
- 160 $
- Materials tax
- 80 $
- Project budget
- 1840 $
How this tool works
Adjust the labeled inputs to see a new calculation. Units and assumptions are shown beside each field. Printed and copied results use the same calculation.
This is a planning estimate, not a structural design, permit document or binding quote. Check product specifications and actual site measurements.
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