Ampsheet
Every answer cites the article
Only for iPhone
Free · In‑App Purchases
iPhone
Ampsheet is an electrical design and field reference tool for commercial and industrial work: services, feeders, panels, motors and one-line risers. It runs on your device and cites the article behind every answer.
CALCULATIONS AT THE DESK
Circuit. Conductor sizing against the two-step derate and termination rule, voltage drop with real impedance at power factor, raceway fill, and parallel sets. It shows the derivation, not just the answer.
Loads. FLA, amps, VA or kW at any voltage and phase, with a running tally you build straight off a mechanical schedule. Continuous loads are flagged and sized at 125%.
Motors. Table full-load current, branch protection, overload, disconnect and NEMA starter. Table FLC and nameplate FLA are kept in their separate jobs, because they are not interchangeable.
Panels. Schedules from a six-circuit load center to a four-section switchboard. Phase rotation across sections, load classification rollup, noncoincident handling, and a design review that checks the numbers you entered.
Power. Transformer sizing and primary protection, with available fault current from a complex impedance network rather than a lookup table.
DRAWINGS FROM THE FIELD
Riser. Walk a service and record it as you go. Pick the utility source, then work downstream; the app draws the one-line. A multi-story building is drawn the other way up, as a building riser: floors stacked the way the building stacks them, service at the bottom, feeders climbing. Attach photos, mark gear existing, new or demo, and print the sheet.
The kind of thing it catches: a 25 kW charger at 480 V three-phase draws 30.1 A. That points at a 35 A breaker, and 35 A is wrong. EV supply equipment is a continuous load, so it sizes against 125% of the draw. The answer is 40 A. Ampsheet says so, and cites the article that says so.
WHAT COMES OFF THE PHONE
Panel schedules and riser drawings export as PDF, sized letter or 11 x 17 depending on the drawing. These are for field reference, coordination and RFIs. Every sheet is stamped FIELD NOTES and NOT FOR CONSTRUCTION on its face and carries a disclaimer. Nothing Ampsheet produces is a sealed or approved document.
CODE EDITIONS
NEC 2020, 2023 and 2026, with article numbers translated between them. Article citations and calculated values verified against NEC 2020, 2023, 2026. Local amendments still apply. Confirm against the edition adopted in your jurisdiction.
HOW IT WORKS
• No account, no sign-in, no sync. Nothing you enter leaves the device
• Works with no signal. Every calculation runs on the device
• One subscription, every feature. No tiers, no add-ons, nothing held back
• No ads, no analytics, no tracking
SUBSCRIPTION
Ampsheet Pro is $5.99 per month or $59.99 per year, and new subscribers get a 3-day free trial. Both plans renew automatically until cancelled and include every feature, with no free tier and nothing sold separately inside the app. Payment is charged to your Apple Account when the trial ends, or at purchase if there is no trial, and renews unless turned off at least 24 hours before the period ends. Manage or cancel in your Apple Account settings. Anything you have created stays on your device either way.
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
WHAT IT IS NOT
Ampsheet is a reference and calculation tool. It is not an engineering service, and using it does not create a professional relationship. It does not reproduce the text of any code. It cites article numbers so you can look them up in your own copy. You are responsible for verifying every result before relying on it.
NEC and National Electrical Code are registered trademarks of the National Fire Protection Association. NEMA is a trademark of the National Electrical Manufacturers Association. Wire Monkey Labs LLC is not affiliated with, endorsed by, or sponsored by NFPA, NEMA, or any standards body.
Questions and bug reports: support@wiremonkeylabs.com
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
New subscribers can now start with a 3-day free trial.
The developer, Wire Monkey Labs LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Wire Monkey Labs LLC
- Size
- 33.7 MB
- Category
- Utilities
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Ampsheet Annual $59.99
- Ampsheet Monthly $5.99
- Copyright
- © 2026 Wire Monkey Labs LLC