Why one number tells you little
Accuracy changes with the input. A clean sheet with a clear fixture schedule is easy to read. A scanned sheet with hand markups is hard. A vendor's number comes from the vendor's test jobs. Your jobs are different.
What accuracy means for a takeoff
- Did it find every item in your scope.
- Did it add items that belong to another trade.
- Is each quantity right.
- Is each size, type and model right.
- Does it say so when it does not know.
The last point matters most. A tool that marks a weak line is more useful than a tool that guesses.
Check the sources line by line
Open each line and look at where it came from. A count should point to a sheet. A requirement should point to spec text. A correct number with no source is hard to use, because you cannot defend it when the general contractor asks.
Test it on a job you already bid
- Pick a finished job where you know the answer.
- Run the same bid packet through the software.
- Compare the two takeoffs line by line.
- Sort the differences: items it missed, items it added, and items you missed.
- Look at how it marked the lines it got wrong.
- Repeat with a hard job: a scanned set, a late addendum or a spec conflict.
What to watch for
- A missed item costs more than a miscount. Look at misses first.
- A wrong line marked as sure is the worst case.
- Items marked by others or owner furnished that the software counted as yours.
Takeoff Tool grades every line Certain, Maybe or Not sure, and links each line to its source.
AI and takeoff software · Updated 11 Nov 2026