CrewMeasure.com

Electrical Calculator

Estimate Tier 1 wire footage, boxes, and outlets with an editable slack allowance.

Sum your actual run lengths, keep the slack assumption visible, and use the tally fields for simple box and outlet counts.

Material List
You'll need 192.5 ft of wire and 0 boxes for this job.

Tier 1 wire runs

Enter each branch-circuit run and adjust the visible slack allowance for the job.

Tier 1 boxes and outlets

Simple user-entered tally by type; these counts are not inferred from the run lengths.

Box fill (NEC 314.16(B) formula)

Optional. Enter a box volume and at least one conductor to check required box-fill volume against the box you're using. Skipped when left off.

Include box fill

Box fill checks whether an electrical box is legally large enough for the wires, devices, and clamps packed inside it. Turn this on if you already know your box's volume.

Wire sizing / voltage drop

Optional. Solves the minimum conductor size for a target voltage-drop budget using standard Ohm's-law-family physics and public AWG resistivity constants. Skipped when left off.

Include wire sizing

Voltage drop is power lost as heat over a long wire run, which can dim lights or undersize a circuit. Turn this on to size a conductor for a long run.

GFCI/AFCI location flags

Optional. Tag devices by location to flag conventional GFCI (kitchen countertop, bathroom, garage, outdoor, unfinished basement/crawlspace) and AFCI (bedroom, NEC 210.12) coverage. General guideline only -- verify locally.

Include location flags

GFCI protects against shock near water; AFCI protects against arc-fault fires in bedrooms. Turn this on to flag which of your devices code typically requires it for, by location.

Circuit / breaker grouping

Optional. Suggests circuit groupings so each circuit's summed load stays at or under 80% of the breaker rating. Simple rule of thumb -- verify locally before finalizing panel scheduling.

Include circuit grouping

Turn this on to sort a list of device loads into circuits that each stay safely under 80% of the breaker rating.

You'll need 192.5 ft of wire and 0 boxes for this job.

You'll need

Combined wire and box estimate

Base wire footage
175 ft
Wire footage with slack
193 ft

Actual: 192.50000000000003 ft (rounded up for purchase)

Boxes
0 count
Outlets
0 count

Warnings

  • INFO Advanced code table lookup is not available until reference data is verified.
  • INFO This is a general reference only. Verify local requirements and field conditions before installation.

Detail values

Assumptions

  • Slack allowance: 10% (editable)

Included: wire footage with slack allowance, box and outlet tally.

Not included: labor, permits, inspection fees, fixtures and fittings beyond what's itemized above.

Formula details
  • Wire footage: sum(runLengths) * (1 + slackAllowancePercent / 100)

Tier 2 conduit fill

Advanced code table lookup is not available until reference data is verified.

Conduit fill inputs unavailable

Verified NEC Chapter 9 Table 4 and Table 5 data is required before fill limits or pass/fail results can be calculated.

FAQ

Why is the slack allowance editable?

CrewMeasure starts at 10%, but job conditions such as box drops, splices, and service loops can require a different allowance.

Why is conduit fill unavailable?

Conduit fill needs verified NEC Chapter 9 Table 4 and Table 5 datasets. CrewMeasure does not substitute unverified values.

Disclaimer

This is a general reference and material-estimate tool only. Verify local requirements, equipment specifications, and field conditions before installation.