How to measure area and length on a PDF
With the scale set, measuring is the heart of a takeoff: trace areas for square footage, runs for linear feet, and tally counts. Here is how to do each one accurately, deduct openings, and speed it all up.
Measure area, length, and count
- Set the scale first. Calibrate the sheet so everything reads in real feet. See how to set the scale on a PDF.
- Measure area. Use the area tool to trace the boundary of a space, floor, wall, or roof plane, and read the square footage. Keep each type on its own group.
- Measure length. Use the length tool to trace a run, a wall, pipe, conduit, or curb, and read the linear feet. Snap to the linework so the line lands on the drawing.
- Deduct openings. Cut out doors, windows, and holes from an area so your quantity is net rather than gross.
- Count items. Use the count tool to tally repeated items, fixtures, devices, and equipment, with running subtotals by type.
- Export. Send areas, lengths, and counts to Excel or CSV for your estimate.
Tips for accurate measurements
- Snap to geometry so your trace follows the drawing instead of drifting off the line.
- Deduct openings as you go, so wall and floor areas are net.
- Separate by type onto groups, so square footage and linear feet roll up the way you bid.
- Use detection to save time. Detect Spaces names rooms for instant areas, and Detect Runs groups line-work into runs for you to review.
Put it to work by trade
Every trade measures a bit differently. See exactly what to measure and count for yours, from electrical and HVAC to concrete and roofing, on the takeoff by trade page.
Common questions
How do I measure square footage on a PDF?
Set the scale first, then use the area tool to trace the boundary of the space. The software reads the enclosed square footage to scale, and you can cut out openings so the area is net.
How do I measure linear feet?
Use the length tool to trace the run, such as a wall, pipe, or curb. Snapping to the drawing's geometry keeps the line on the linework, and the software reads the total linear feet.
Can I speed up measuring?
Yes. Detect Spaces outlines and names rooms for instant areas, and Detect Runs groups wall and pipe line-work into linear runs, so you review and adjust instead of tracing every one by hand.