Conduit and Wire Takeoff:
The Footage and Allowance Method

Measure conduit runs first

Every wire takeoff starts with conduit footage, and conduit footage comes from the plan — but plan view only shows horizontal runs. The number you scale off the drawing is the 2D route length from panel to the last device on a homerun. That measured distance is your baseline, not your final conduit number.

Vertical drops and risers are invisible in plan view and have to be added manually. A receptacle at 18 inches AFF in a space with a 10-foot finished ceiling adds roughly 8.5 feet of conduit per drop when you account for the stub-up at the ceiling and the drop to device height. Multiply that by every outlet on the circuit and the vertical component can easily exceed the plan-measured horizontal run on a dense branch circuit.

Before you scale a single run, verify the drawing scale. A common error is measuring off a plan that was printed reduced — say, a 1/4" = 1’-0" set printed at 60% to fit letter paper. Every length reads short by the same factor, and that error compounds across hundreds of measured runs. Always confirm scale by checking a known dimension on the drawing against the printed title block.

• Conduit footage = measured 2D plan run + all vertical drops/risers
• Device at 18" AFF from a 10’ ceiling adds ~8.5 ft of vertical per device
• Verify architectural scale (e.g., 1/4" = 1’-0") before measuring any run

Convert conduit feet to wire feet

This is the step where wire takeoff diverges from conduit takeoff, and where estimators who conflate the two numbers end up short on material. Wire footage is conduit footage multiplied by the number of conductors in the circuit, plus termination allowances at each end.

A standard 120V branch circuit carries three conductors: one ungrounded (hot), one grounded (neutral), and one equipment grounding conductor. That means every foot of conduit corresponds to three feet of wire to be pulled. A 200-foot homerun feeding eight devices requires 600 feet of wire before any allowances — not 200.

Termination allowances account for the wire needed to make up connections inside panels and devices. Industry practice (Universe Estimating, 2025) is 2 to 3 feet per conductor at each panel landing, and 6 to 12 inches per conductor at each device. On a 3-conductor homerun feeding 8 devices, that’s approximately 24 feet of wire just for device make-up (8 devices × 3 conductors × 1 ft/device), plus another 6 to 9 feet at the panel. Small numbers per connection, but they add up fast on a full floor.

• Wire footage = conduit footage × conductors per circuit + termination allowances
• Add 2–3 ft per conductor at each panel landing
• Add 6–12 inches per conductor at each device

Separate by wire size and type

A takeoff that lumps all wire into one line item will produce a useless number when you go to price it. Wire cost varies substantially by AWG size and insulation type, and both of those vary by circuit type and location. Breaking the takeoff into separate line items by wire size and insulation is not extra work — it’s the minimum structure needed to price the job accurately.

Branch circuits are most commonly #12 AWG (20A) or #14 AWG (15A) copper in THHN insulation for conduit installations, or NM cable in wood-frame residential. Feeders scale up through #6, #4, #2, and larger depending on load. Each size and insulation type gets its own row in the takeoff, with its own footage total and unit price.

Copper conductor prices are not stable. In early 2025, tariff pressure and supply constraints pushed copper wire prices up 14 to 17% over the prior year. Pricing wire from a stale material database or last quarter’s supplier quote can put a significant hole in a bid. On a large commercial project with tens of thousands of feet of feeder and branch circuit wire, a 15% price swing is material to the job margin. Price wire close to the bid date, and consider a material escalation clause on longer jobs.

• Line items by AWG size and insulation type (THHN, XHHW, NM cable)
• Branch circuits: typically #12 AWG (20A) or #14 AWG (15A) copper
• Copper prices rose 14–17% in early 2025 — use current supplier pricing

Add a waste factor

Measured footage plus termination allowances gives you the theoretical minimum wire required. In practice, field pulls produce offcuts and there is always some pulling waste from damaged insulation, mis-pulled runs, and end-of-reel remnants. A waste factor applied on top of the allowance-adjusted footage accounts for this.

Most electrical estimators apply 5 to 10% waste depending on job complexity. Simple straight runs in open ceilings warrant the lower end; dense conduit systems with many 90-degree bends and junction boxes warrant the higher end. Apply the waste factor to the total footage per wire size before converting to reel quantities.

After applying waste, round each wire size up to the next standard reel or box quantity. Wire is sold in 250-foot, 500-foot, and 1000-foot reels (and larger spools for large-gauge feeders). Pricing and ordering against fractional reel quantities creates procurement complications and understates material cost. Also carry pull string, fittings, and connectors as their own line items — these are frequently omitted and add up on a multi-floor commercial job.

• Apply 5–10% waste on top of measured-plus-allowance footage
• Round up to standard reel sizes: 250 ft, 500 ft, 1,000 ft
• Carry pull string, fittings, and connectors as separate line items

Verify against the panel schedule

A conduit and wire takeoff does not stand alone. Before you finalize quantities, cross-check the circuit count you measured on the floor plan against the panel schedule circuit count. If the schedule shows 42 circuits and you only traced 38 homeruns on the plan, four circuits are missing — either they’re on a sheet you haven’t measured yet, or there’s a plan coordination error worth raising before bid.

Feeder sizes are another common source of error. The floor plan typically shows conduit routing, but feeder conductor size is specified on the one-line diagram or in the panel schedule, not in plan view. Always pull feeder sizes from the one-line; pulling them from the plan can result in the wrong AWG on the most expensive wire in the job.

Any circuit that appears on the panel schedule with no corresponding homerun shown on the floor plan should be flagged as a discrepancy and submitted as an RFI before the bid date. Including a scope note in your bid that calls out the discrepancy protects you from a change order argument later. A panel schedule versus plan check takes 15 minutes and frequently uncovers enough missing scope to change the job number.

• Cross-check homerun count against panel schedule circuit count
• Pull feeder sizes from the one-line diagram, not the floor plan
• Flag circuits on schedule with no floor plan homerun as RFI items

Questions estimators actually ask