Wire Size & Ampacity Calc
Derating, AWG/mm², NEC IEC
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
The right conductor, code-checked: ampacity with real derating, breaker suggestion and conduit fill — NEC and IEC side by side.
Size conductors the way the code book does — without flipping pages.
Pick NEC or IEC, enter the load, set the real conditions, and read the minimum conductor size on one screen.
WHAT IT DOES
- NEC (NFPA 70) Table 310.16 ampacities: copper and aluminum, 60/75/90 °C columns, 14 AWG to 500 kcmil
- IEC 60364-5-52 method C ampacities: copper, PVC or XLPE, 1.5 to 300 mm²
- Ambient-temperature correction and grouping adjustment applied automatically
- 125 % continuous-load design current
- Suggested breaker from the standard ladder, small-conductor caps included
- Pro: full derating breakdown, conduit-fill summary (NEC Ch. 9 Table 1), voltage-drop cross-check, history and one-page PDF export
BUILT FOR THE FIELD
Big glove-friendly keys, an Outdoor Bright theme for direct sunlight, and everything works offline.
PRIVACY
Everything stays on your phone. No account, no ads, no tracking.
A planning aid, not a substitute for the code — always confirm results with your local code authority and the current edition.
PRO UNLOCKS: both NEC and IEC standards, full derating detail, conduit fill, voltage-drop checks, history and PDF export. Available as an auto-renewable subscription (monthly or yearly) or a one-time Lifetime purchase.
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Privacy Policy: https://hdappstudio.com/wiresize/privacy/
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The developer, HD YAPIMCILIK VE TEKNOLOJI ITHALAT IHRACAT TICARET LIMITED SIRKETI, 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:
- Purchases
Accessibility
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Information
- Seller
- HD YAPIMCILIK VE TEKNOLOJI ITHALAT IHRACAT TICARET LIMITED SIRKETI
- Size
- 10.2 MB
- Category
- Utilities
- Compatibility
Requires iOS 16.0 or later.
- iPhone
Requires iOS 16.0 or later. - iPad
Requires iPadOS 16.0 or later. - Mac
Requires macOS 13.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 10 more
- English, Arabic, French, German, Italian, Japanese, Korean, Portuguese, Simplified Chinese, Spanish, Turkish
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- WireSize Pro — Lifetime $29.99
- WireSize Pro — Yearly $14.99
- WireSize Pro — Monthly $2.99
- Copyright
- © 2026 Ercan Onur Ensert