Quick Answer: Calculate cubic yards, rebar tonnes, and form area from your drawings. CyanBuild reads your concrete drawings, measures slab, footing, wall, and column areas off the scaled drawings, applies the section depth to compute volume in cubic yards, and sizes rebar by bar size from the rebar schedule. Each line item carries a confidence flag so your estimator knows what to verify.
Concrete takeoff is the process of measuring every quantity on a concrete plan, the units your trade actually bills on. Done by hand it means tracing areas with a scale wheel and pulling depths and bar sizes off the sections, which is slow and easy to get wrong on a set with multiple slab types and wall elevations. AI reads the same drawings in seconds and reports the same quantities, with the math shown for every number.
What Trade Specific Takeoff Means
Concrete work sits in CSI Division 03, and it is the trade where the takeoff carries the most separate quantities types on the same set. A concrete estimator measures area, volume, weight, and length, all in one pass. The slab is measured in square feet and converted to cubic yards with the slab depth. The footings and walls are measured in volume from the section depths. The rebar is measured in linear feet, converted to weight in pounds or tonnes by the bar size, and the bar size comes off the rebar schedule, not the plan. The formwork is measured in square feet of contact area, the finish is measured in square feet of surface, and the joints are measured in linear feet.
Trade specific takeoff means the software knows that a slab on grade, a footing, a wall, and a column are each a different concrete assembly with a different unit and a different depth, and that the rebar schedule on sheet S201 controls the bar size and spacing on the plan. Without that trade knowledge you are left measuring the area on a PDF and pulling the depths and bar sizes off the sections by hand, which is the manual workflow takeoff software is supposed to replace.
What Counts on the Drawings
A concrete set typically includes the structural plans, the foundation plan, the sections and details, and the rebar schedule. The quantities live across all of them. On the plans you measure the slab and footing area, the wall length and height, and the column count, all to scale. The sections and details give you the depths that turn area into volume, the bar sizes and spacings that turn length into weight, and the formwork scope at every edge and opening. The rebar schedule gives you the bar marks, the sizes, the lengths, and the bends, which is what drives the rebar weight and the shop drawing list.
Rebar is the part most estimators undercount by hand. A 100 foot run of wall is not just 100 feet of horizontal bar. It includes the vertical bars at the spacing called out on the schedule, the dowels into the footing, the lap splices at every bar break, the corners and the hooks at the ends, and the ties or stirrups in the beams and columns. A takeoff tool that reports the concrete volume but ignores the rebar weight and the lap leaves the bulk of the budget to the estimator, because rebar is a large share of the material cost on a reinforced concrete job.
What Good Takeoff Software Does for This Trade
Good concrete takeoff software reads the scaled PDF or DWG, measures the slab, footing, wall, and column areas, and pulls the section depths off the details to compute the volume in cubic yards. It traces the rebar from the plan and the schedule, applies the lap splice and the hook lengths from the bar marks, and reports the rebar weight in pounds or tonnes by bar size. It measures the formwork as contact area, the finish as surface area, and the joints as linear feet, each on a separate line item, so the takeoff reads the way the concrete contractor prices and buys the job.
The better tools also tie every quantity back to the section and the detail that drove it, so when the estimator sees a 40 cubic yard footing takeoff, they can click through to the section that gave the depth and the plan that gave the area. That traceability is what makes the takeoff defensible, because the field and the architect can see where every number came from.
Must Have Features
- Volume from area and depth. Measure the slab, footing, wall, and column area off the plan and pull the depth off the section to compute cubic yards by assembly.
- Rebar weight from the schedule. Trace the bar marks, sizes, and spacings from the rebar schedule, apply the lap and hook lengths, and report weight in pounds or tonnes by bar size.
- Formwork as contact area. Measure the form contact area at every edge, opening, and joint, broken out by wall, footing, and slab.
- Finish, joints, and vapor barrier on separate line items. Square feet of finish, linear feet of control and expansion joint, and square feet of vapor barrier, each its own line item.
- Confidence flags on every line. High, Medium, or Low per item, so review time goes to the quantities that need it.
- Section and detail traceability. Every quantity links back to the plan, the section, and the detail that drove it, for a defensible bid.
What to Watch Out For
The most common gap is a tool that measures the concrete volume but ignores the rebar, the formwork, or the finish. A volume takeoff is the easy part of a concrete takeoff. The rebar weight, the formwork area, and the finish and joint quantities are where the hours and the dollars actually live, and a tool that stops at cubic yards leaves the estimator building the rest of the bid by hand. If the tool reports the concrete but never pulls the rebar schedule, you are still doing the rebar takeoff the manual way.
Watch for tools that only read the plans and ignore the sections and the details. The depths, the bar sizes, and the formwork scope live in the sections, and a tool that cannot read them leaves the volume and the rebar to the estimator. Also confirm the tool reads scanned PDFs, because a large share of concrete bids start as flattened plan sets, and ask whether the lap splice and hook lengths are applied from the bar marks, not hard coded to a single number that may not match the detail.
How CyanBuild Fits
CyanBuild reads PDF, DWG, DXF, and image files, including scanned sheets, and measures the slab, footing, wall, and column areas off the scaled drawings with the section depths applied to compute volume in cubic yards. It traces the rebar from the schedule, applies the lap and hook lengths, and reports the rebar weight by bar size. Formwork, finish, joints, and vapor barrier come off the sections and details as separate line items. Every quantity carries a confidence flag tied to the sheet, section, and detail that drove it, and the export is a line item takeoff ready for pricing, with the math shown for every number.
Putting It Together
Concrete takeoff is a four unit trade, area, volume, weight, and length, all on the same set. The volume is the easy part. The value is in the rebar weight from the schedule, the formwork area from the sections, and the finish and joint quantities from the details, each on its own line item. Pick software that does the volume, the rebar, and the formwork in one pass, flags the items it is less sure about, and shows the math behind every number. That is what turns a takeoff from a manual measurement into a defensible bid, and it is what lets your estimator spend the saved hours on sequencing and pour planning instead of pulling depths off the sections by hand.