Tasks in hours

  • 3

  • 9

  • 10

  • 13

  • 3.5

  • 4

Estimate per task = (best + 4 × likely + worst) ÷ 6. Break the work into tasks of a day or less.

Corrections and price

%

Calls, email, feedback rounds. 15 to 25% for most projects.

×

Actual ÷ estimated hours on past projects. 1.2 if you do not know yet.

€/ h
h

For the number of working days.

Your estimate

61.2hours

Quote

€4,600

Working days

10.5 at 6 h

Sum of likely (gut feeling)
39 h
Task estimates (PERT)
42.5 h
Hidden work (+20%)
+8.5 h
Personal factor (× 1.2)
+10.2 h
Estimate
61.2 h
× €75 per hour, rounded up
€4,600

Adding up the likely column says 39 h. The estimate is 57% more. Quoting the gut feeling would mean about €1,665 of unpaid work.
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Project Estimate Calculator by Winnie