Electrical estimate calculator
An electrical estimate calculator multiplies each counted item by its material cost and by its labor hours per unit, applies a labor rate and a difficulty factor, then adds overhead and profit to reach a bid price. This one is free, runs in your browser, and starts with four example rows you replace with your own prices and labor units. It doesn't supply labor units: those depend on your crews, and the industry reference, the NECA Manual of Labor Units, is a copyrighted, paid publication1.
| Item | Material | Hours |
|---|---|---|
| Duplex receptacle, 20 A (example) | $720.00 | 24 |
| Single-pole switch (example) | $264.00 | 8.8 |
| 2x4 LED troffer, type A (example) | $3,960.00 | 36 |
| Exit sign, type X (example) | $360.00 | 4.5 |
| Summary | Basis | Amount |
|---|---|---|
| Material | Quantity × unit material cost | $5,304.00 |
| Misc. material | 5% of material (fittings, connectors, supports) | $265.20 |
| Sales tax | 0% of material | $0.00 |
| Labor | 73.3 h × 1.00 = 73.3 h at $75.00/h | $5,497.50 |
| Direct cost | $11,066.70 | |
| Overhead | 10% of direct cost | $1,106.67 |
| Profit | 10% markup on cost (9.1% margin) | $1,217.34 |
| Bid price | $13,390.71 |
How to use the electrical estimate calculator
- Clear the examples. The four starting rows exist to show the format. Their prices and hours are placeholders, so press "Clear the example rows" or overwrite them.
- Enter the counts from your takeoff. One row per item: a device, a fixture type, a length of conduit or cable. If your counts are already in a spreadsheet, paste them in the box (description, then quantity, one item per line) and press "Add pasted items".
- Add your unit material cost. Use your current supplier quote or price file, including the box, plaster ring, device and plate if you price an assembly as one row.
- Add your labor hours per unit. From your own job history or a labor unit manual you're licensed to use. See below for how to build them.
- Set the labor rate and the difficulty factor. The rate should be your burdened cost per hour. The difficulty factor adds a percentage to every hour for conditions the units don't cover: working height, occupied space, phasing, a tight schedule.
- Set misc. material, tax, overhead and profit, then download the CSV to keep the estimate or paste it into your bid template.
The math in each line
Extended material = quantity × unit material cost
Labor hours = Σ (quantity × hours per unit) × (1 + difficulty %)
Direct cost = material + misc. material + sales tax + labor hours × rate
Bid price = (direct cost + overhead) × (1 + profit markup)
Profit here is a markup on cost; the summary also shows the margin it produces. If you price by margin, the construction cost estimator lets you enter either and explains the difference.
Electrical work estimate sample
Here is the calculator's example worked through, with 5% misc. material, no sales tax, a $75 labor rate, no difficulty factor, 10% overhead and 10% markup. All of these numbers are placeholders to show the arithmetic, not a price for real work.
| Item | Qty | Material | Hours |
|---|---|---|---|
| Duplex receptacle, 20 A | 48 | 48 × $15.00 = $720.00 | 48 × 0.5 = 24 |
| Single-pole switch | 22 | 22 × $12.00 = $264.00 | 22 × 0.4 = 8.8 |
| 2x4 LED troffer, type A | 36 | 36 × $110.00 = $3,960.00 | 36 × 1 = 36 |
| Exit sign, type X | 6 | 6 × $60.00 = $360.00 | 6 × 0.75 = 4.5 |
| Material and misc. | $5,304.00 + 5% = $5,569.20 | ||
| Labor | 73.3 h × $75 = $5,497.50 | 73.3 | |
| Overhead | 10% of $11,066.70 = $1,106.67 | ||
| Profit | 10% of $12,173.37 = $1,217.34 | ||
| Bid price | $13,390.71 |
Why this calculator doesn't include labor units
Labor units are the part of an electrical estimate that's most specific to the shop. The same receptacle takes a different number of hours for a crew that preassembles in the shop, on a slab-on-grade retail box versus a hospital renovation above an occupied ceiling. A default number on a public page would look authoritative and be wrong for most of the people using it.
The common reference, the NECA Manual of Labor Units, is a paid publication: the 2025 to 2027 edition is sold as a PDF and as a subscription in the NECA store, NECA member companies get a complimentary two-year subscription, and the content is copyrighted by NECA1. We don't reproduce it. Even NECA presents its units as a baseline to adjust: each item has three columns (normal, difficult and very difficult installation conditions), users are encouraged to pick values between or beyond the columns when appropriate, and supervision isn't included in any of them2.
How to get labor units you can trust
Your own job cost history
Divide the hours charged to a cost code by the quantity installed on finished jobs. A few jobs of the same type give you a unit that already reflects your crews and your methods.
A licensed labor unit manual
The NECA manual or the database in your estimating software. NECA's units cover normal material handling, drawing study, layout, installation and normal non-productive labor2, so don't add those again.
Adjust, then record
Use the difficulty factor for job-wide conditions and track actual hours against the estimate. The next bid starts from better numbers.
Outside help
If you have no history yet and no manual, an outsourced estimator brings their own units. The guide to electrical estimating services covers what they charge and what to check before you bid on their numbers.
Electrical estimating worksheets: what columns to keep
The CSV this calculator exports has the columns most electrical estimating worksheets share: item, quantity, unit material, extended material, labor hours per unit and extended hours, then a summary block. Keep the units in their own column instead of baking them into a price per item, so you can see where the hours went when a job runs over. For a fuller workbook, start from the electrical estimate template, and for the proposal you send the GC, the electrical bid template. When the row count runs into the hundreds and several estimators share one price file, a calculator stops being the right tool; the commercial electrical estimating software guide covers what to move to.
Where the quantities come from
Every number in the estimate multiplies a count, so the count is where most of the risk sits. Counts come from the takeoff: going sheet by sheet through the electrical plans and tallying each symbol in the legend. The electrical takeoff sheet is a template for doing it by hand, and the electrical takeoff software guide compares tools that do it on screen. Feeder and service rows are the exception: on design-build work, size them first with the NEC load calculation worksheet, then add the wire and conduit as measured rows.
AmpCount is one of those tools. It reads the legend on a vector PDF plan set, counts every device and fixture on every sheet, holds uncertain marks for you to confirm, and exports the quantities to Excel or CSV, ready to paste into the box above. It doesn't price material or apply labor units: that part stays with you and this calculator. For the full process from count to bid, see how to bid electrical jobs.
Count the devices, check the numbers
AmpCount reads the legend on a vector PDF set, counts every electrical device and fixture on every sheet, keeps uncertain marks out of the count until you confirm them, and checks fixtures against the schedule. $149 a month or $1,490 a year for a team of up to 3, cancel anytime, full refund within 14 days.
More electrical estimating resources
Sources
- NECA, The 2025-2027 NECA Manual of Labor Units Is Now Available (September 18, 2026)
- ECA Chicago, NECA Manual of Labor Units: what is included, supervision and the three columns
NECA is a trademark of the National Electrical Contractors Association. AmpCount is not affiliated with NECA.