No trail
No versions, no record of which standard, cable table or short-circuit hypothesis was used. When the calculation is challenged, there is no way to defend it.
standardized methods · IEC 60909 · NBR 5410 · IEEE 80
Electrical sizing with the rigor of the standard — and the traceability your spreadsheet never had.
Size cables, short-circuit and grounding, capacitor banks, surge arresters and battery banks by IEC, NBR and IEEE methods — the same calculation an expensive package delivers, now with a calculation report in Word ready to sign.
- 13
- verified calculation routines
- 14+
- citable standards and methods
- 3
- normative frameworks
- .docx
- report ready to sign
Your electrical sizing spreadsheet was built by someone who left the company 6 years ago. Do you still trust it?
Breaks when edited
One cell overwritten by mistake and the whole sizing silently starts to lie. No one notices until a breaker fails to trip or a cable overheats in the field.
No report
The document you sign off for the project you still assemble by hand, copying number by number. Hours lost, transcription errors.
From the load list to the report, in three steps.
- 01
Enter the installation
Loads, voltage, feeders and the short-circuit source. The same data you already gather in the spreadsheet — only validated on input.
- 02
Calculate with a standardized method
Short-circuit by IEC 60909, cable ampacity and voltage drop by NBR 5410, grounding by IEEE 80. Transparent, never a black box.
- 03
Download the report in Word
A formatted calculation report, with cited formulas and standards — ready to attach to the project and sign with engineering responsibility.
What you size here.
All 13 calculation routines, already available in the workspace.
The precision of expensive software. The price of a spreadsheet.
The same standardized calculation that engineering software costing thousands delivers — with nothing to install, no license, and a report ready to sign.
| Feature | LOGOS | Excel spreadsheet | Engineering software |
|---|---|---|---|
| Price | Free to start | Free | Thousands per license |
| Calculation report in Word | ✓ | ✕ | sometimes |
| Standardized, citable methods | ✓ | depends on who built it | ✓ |
| Traceability and versioning | ✓ | ✕ | partial |
| Nothing to install (web) | ✓ | ✓ | ✕ |
| Automatic standards updates | ✓ | ✕ | paid |
| Methods per IEC, NBR and IEEE | IEC · NBR · IEEE | — | black box |
| Learning curve | minutes | inherited and fragile | weeks |
Informative comparison, based on the typical use of each alternative. “Engineering software” refers to proprietary sizing packages.
Every number has a standard behind it.
No black box. Every calculation follows an established method, citable in the report — the same ones that experts, inspectors and auditors recognize.
- IEC 60909
- IEC 60364-5-52
- NBR 5410
- IEEE 80
- NBR 15751
- IEC 60099-4
- NBR 16050
- IEC 61643-11
- IEC 61869
- NBR 6856 / 6855
- IEC 61439
- IEEE 485 / 1115
- IEC 60831
- NBR 14306 / 15465
Start free. Pay when you deliver.
During the open beta, every account gets the Multidiscipline plan free — no card required. Prices below apply after the beta.
Free forever
$0forever
- Selected calculators, free to use
- Up to 3 projects saved
- 2D/3D diagrams of your system
recommended
Professional
$25/mo
- All calculators in the discipline
- Word report (.docx), ready to sign
- Unlimited projects and calculations
Multidiscipline
$75/mo
- All disciplines, as they launch
- Everything in Pro
- One subscription, every workspace
- Individual board & Kanban (team in Teams)
Teams
$200/mo
- 5 users included
- Everything in Multidiscipline
- Shared team projects & Kanban
“I am an engineer. I got tired of redoing the same sizing in a spreadsheet that no one dares to touch. I built LOGOS to give the calculation what Excel never gave it: provenance.”
— the team behind LOGOS