HOME PLANNING MODULEDIY-VS-CONTRACTOR-CALCULATORMODEL · COMPARE · DECIDE
Home Planning · reviewed September 11, 2026
DIY vs Contractor Calculator
Compare a contractor quote with DIY materials, tools, your time value and an expected redo-risk cost to see the risk-adjusted difference.
Quick answer
DIY vs Contractor Calculator
DIY looks different when time and redo risk are counted. The calculator shows both cash-only DIY cost and a risk-adjusted economic cost.
Formula: Risk-adjusted DIY cost = materials + tools + (DIY hours × value of time) + (redo probability × redo cost).
All-in quote for the comparable scope.Materials you would buy yourself.Tools, rentals and disposal you would pay for.Your best estimate of total hands-on and project-management time.What an hour of your time is worth for this decision.Your own risk estimate, not a site-provided probability.Estimated extra cost if the modeled redo event occurs.
Enter your numbers and calculate.
How the calculation works
Risk-adjusted DIY cost = materials + tools + (DIY hours × value of time) + (redo probability × redo cost).
Every rate, percentage, cost and value assumption shown in the calculator can be changed. Results are scenario math based on your inputs, not quotes, appraisals, code determinations or predictions.
Questions people ask
What is the break-even value of my time?
It is the hourly value at which the risk-adjusted DIY path equals the contractor quote.
Is redo probability a recommendation?
No. You choose the probability yourself.
Does this tell me whether I should DIY electrical or structural work?
No. Safety, licensing and code decisions are outside this calculator.