Find every member, not just the obvious ones
Beams and girders on the framing plan are easy. The tool should also surface the braces referenced to an elevation, the lintels in a detail, and the column sizes that only exist in the schedule.
Steel takeoff software · Early-access pilot
Steel takeoff software
Steel takeoff software
for structural drawings.
A steel takeoff is a list of every member in the drawing set, with its section, mark and length. Getting there by hand means searching sheet after sheet. SteelBox reads the drawings, finds the members, marks and section labels, and queues each one for you with the evidence on screen. You confirm, measure and group. The takeoff is yours; the searching is not.
- Reads framing plans, sections, details and schedules
- Every member links to the sheet and region it came from
- Calibrated measurement, approved grouping, nothing auto-committed
Built forSteel fabricatorsSteel estimatorsSteel contractorsDetailersPreconstruction teams
What to expect
What steel takeoff software should help you do.
Any takeoff tool lets you count. The useful question is how much of the searching, reading and cross-referencing it takes off your desk, and whether you can still check its work.
Read the drawing's own notation
Section labels, marks, grid references and "see detail" callouts are how structural sets communicate. Software that treats a sheet as a picture leaves all of that reading to you.
Keep quantities tied to evidence
A count with no source cannot be checked. Each member should carry the sheet, the region and the confidence of the read, so a reviewer can verify it in seconds.
Measure with a known scale
Lengths from an uncalibrated PDF are guesses. The tool should ask for a known dimension before it measures anything, and never trust its own scale silently.
Group without overwriting
Applying one length to similar members saves hours and causes errors. Grouping should be proposed, approved by you, and never overwrite a value you entered.
Leave the decisions to you
Ambiguous labels, crossed leader lines and conflicts between plan and schedule are judgment calls. The tool should flag them, show you the evidence, and wait.
The takeoff workflow
From drawing set to reviewed takeoff.
This is how a takeoff runs in SteelBox. At every step, the left column is what the software does and the right column is what stays with you.
SteelBoxReads every sheet in the set: linework, text, section labels, marks and schedule entries.
YouAdd the structural drawing set for the revision you are taking off.
SteelBoxFinds members on the plans, groups them by section, gives each a stable number, and flags reads it is unsure about.
YouNothing yet. This is the sheet-by-sheet searching you no longer do by hand.
SteelBoxGuides you to a clear, known dimension on the sheet.
YouClick its two ends and confirm the value. The scale is now set and visible for every later measurement.
SteelBoxOpens the right sheet, focuses the next unresolved member, and shows its section, mark, source region and confidence.
YouConfirm, edit, reject or skip. SteelBox moves to the next one.
SteelBoxMeasures point to point at the calibrated scale and proposes same-section members that might share the length.
YouApprove which members join the group. Manual values are never overwritten.
SteelBoxCollects confirmed members with section, length and status for takeoff and bill of materials.
YouDo the final review, then price it in your estimating system. The output workflow is under active development with pilot teams.
Evidence-first
Every quantity points back to the drawing.
The difference between a takeoff you can defend and one you have to redo is whether each number has a source. SteelBox keeps that link for every member.
Drawing regionSheet, grid and the exact area read
AI readSection, mark and a confidence value
Why reviewFlags such as a label crossed by a leader line
Your decisionConfirm · Edit · Reject · Skip
Reviewed memberIn the takeoff, with its trail
What AI suggests
- Members it found on each sheet, and members it thinks are missing
- Section labels and marks, matched to schedule entries where they exist
- Which same-section members might share a measured length
- Which items to review first, based on uncertainty
What you confirm
- Scale calibration, once per sheet, before any length is trusted
- Each member's section and mark, after seeing the evidence
- Each measurement, and each group a measurement applies to
- Anything the drawings leave ambiguous
Manual takeoff
Where manual structural steel takeoff loses time and members.
Estimators and detailers who take off steel by hand know these. They are not carelessness. They are what happens when one person has to search a large set under a deadline.
The search problem Time
- Which sheet is this member detailed on?
- Which schedule row is mark B2-07?
- Where did I see that callout?
- Did I already count this bay?
Most takeoff hours go to questions like these, not to engineering judgment.
The evidence problem Trust
- Where did this length come from?
- Was the PDF scale checked?
- Is this a 26 or a 36 under the leader?
- Which revision was this taken from?
SteelBox records the answer to each of these with the member, so a reviewer never has to reconstruct it.
The manual method itself is sound, and worth knowing even if you use software. We have written it up step by step in the guide to structural steel takeoff from drawings, with a worked example and the mistakes that show up on most bids.
Generic vs. drawing-intelligence
Generic takeoff tools vs. steel takeoff software that reads the drawings.
General-purpose takeoff tools are good at what they do: measuring and counting anything on a PDF. The gap is everything a structural set says in text.
| Task | Generic PDF takeoff tool | SteelBox |
|---|---|---|
| Finding members | You click or trace each one | Found across the set and queued for your review |
| Section labels and marks | You read and type them | Read from the drawing, kept with the member, confirmed by you |
| Schedules and callouts | You cross-reference by hand | Marks and schedule entries kept together for checking |
| Scale | Set per sheet, often forgotten | Guided calibration against a known dimension |
| Similar members | Copy and paste lengths | Proposed groups, approved by you, manual values protected |
| Evidence trail | Markup on the PDF, if you made it | Sheet, region, confidence and review status on every member |
| Pricing | Not included | Not included. Stays in your estimating system |
If you are comparing tools in this category, our guide on evaluating AI-assisted takeoff tools lists the questions to put to any vendor, including us.
Who it's for
Who SteelBox is built for.
Take off a set to check scope and material before committing shop capacity.
Get a reviewed member list faster, then spend the bid window on the estimate.
Understand the steel package from the drawings, with a trail you can show.
Find marks, sections and missing members across sheets before modeling.
Quantify structural steel during design development from whatever set exists.
Downstream
How the reviewed takeoff feeds structural steel estimating.
A takeoff is the input to an estimate, not the estimate. Knowing where one ends and the other begins is how you keep both honest.
What the takeoff hands over
- Members with mark, section, count and length
- Review status on each: confirmed, edited, rejected, skipped
- Sheet and region for every member
- The drawing revision it was taken from
What the estimator adds
- Weight per unit length from the section tables
- Connection and miscellaneous steel allowances
- Material, shop, coating, delivery and erection costs
- Risk, schedule and margin
SteelBox stops at the handover line. Read how it fits the rest of the estimator's job on our page about structural steel estimating software, and before you price a reviewed takeoff, run it through the 43-point estimating checklist.
FAQ
Questions about steel takeoff software
What does steel takeoff software do?
It helps you get from a structural drawing set to a list of steel members with section, mark, count and length. Generic takeoff tools give you a place to click and count. Drawing-intelligence software like SteelBox also reads the drawings: it finds members, section labels and marks for you, organizes them, and shows where each one came from so you can confirm it.
Does SteelBox do the takeoff automatically?
No. SteelBox automates the searching: scanning sheets, finding members, reading labels and marks, and queuing the next item for review. Confirming a member, setting the scale, measuring and approving a group are done by you. Nothing becomes part of the takeoff until a person accepts it.
What steel shapes and drawing standards does SteelBox handle?
SteelBox reads section labels as they appear on the drawing, with W-shapes and HSS shown in the examples on this site, and works with AISC imperial and Indian metric drawing standards. Coverage of other shape families and notation styles is confirmed with each pilot team on their own drawing sets, so ask about yours when you request access.
Can SteelBox take off steel from PDF drawings?
SteelBox works from your structural drawing set as issued, and structural sets are usually issued as PDF. Because PDF scale is often wrong after reissue, SteelBox asks you to calibrate against a known dimension before measuring. Confirm your specific file formats with the SteelBox team when you request pilot access.
How is a SteelBox takeoff checked?
Every member carries the sheet and region it was found in, the confidence of the read, and its review status: confirmed, edited, rejected or skipped. A reviewer can walk the list against the drawings without repeating the search, and unresolved items are visible until someone resolves them.
What happens to the takeoff after review?
Reviewed members, with their section, length and status, are collected for takeoff and bill of materials. That output workflow is under active development and is being shaped with pilot teams. SteelBox does not price the steel; the estimate is built in your estimating system on top of the reviewed quantities.
Take off your next set with the searching done for you.
SteelBox is in a limited early-access pilot with structural steel teams. Bring a drawing set you have already taken off and compare.