The generic term
An on-screen takeoff is a takeoff done on a monitor and not on paper. The estimator opens the sheets, sets the scale, and counts and traces with a mouse. People also call this a digital takeoff or an electronic takeoff. All three names mean the same work.
The product name
On-Screen Takeoff is also a measuring tool. Estimators use it to count and trace on plan sheets. Its files end in .ost. When an estimator says the job is in OST, they mean a file from this product.
How to tell which one is meant
- Capital letters, or the short form OST, point to the product.
- Lowercase words in a sentence usually mean the method.
- A job posting that asks for on-screen takeoff experience can mean either. Ask which software the company uses.
- Bid instructions rarely care which tool you measure with. They care about the number.
What any on-screen takeoff includes
- Load the plan sheets.
- Set and check the scale on each sheet.
- Create one item for each thing you count or measure.
- Count and trace. The marks stay on the sheet.
- Review the totals and export them.
What it leaves to the estimator
A measuring tool records what you draw. If you miss an item, the file misses it too. You still read the spec section, check the addenda and decide what is in your scope. The marks on the sheet show what you counted. They do not show what you should have counted.
Takeoff Tool reads an On-Screen Takeoff file if you add one to the bid packet. It reads the quantities you drew.
AI and takeoff software · Updated 11 Nov 2026