Toolbelt - Trade Calculator
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About this app
Toolbelt is a calculator app for working tradespeople. Electricians, plumbers, and carpenters — one app, every common job-site calc, backed by NEC, IPC, and IRC code references.
Built for the truck, the warehouse, and the rough-in.
WHAT'S INSIDE
Electrical
• Wire size by NEC 310.16 — ampacity, voltage drop, OCPD per 240.4(D)
• Conduit fill by Chapter 9 Table 1 — 40/31/53% rules, live overfill warning
• Voltage drop, 1φ / 3φ
• Box fill, 314.16
• Motor full-load amperes
Plumbing
• Pipe sizing by drainage fixture units (DFU)
• Vent sizing
• Water service sizing by Hunter's curve
• Slope and fall
Carpentry
• Concrete volume — slabs, footings, columns, steps, with bag counts
• Lumber framing — header span, joist span, rafter rise/run
• Stair calculator — rise, run, stringer
• Board feet
CODE REFERENCE
• 20+ NEC, IPC, IRC articles
• Offline. Searchable. No subscription required.
Built for the truck, the warehouse, and the rough-in.
WHAT'S INSIDE
Electrical
• Wire size by NEC 310.16 — ampacity, voltage drop, OCPD per 240.4(D)
• Conduit fill by Chapter 9 Table 1 — 40/31/53% rules, live overfill warning
• Voltage drop, 1φ / 3φ
• Box fill, 314.16
• Motor full-load amperes
Plumbing
• Pipe sizing by drainage fixture units (DFU)
• Vent sizing
• Water service sizing by Hunter's curve
• Slope and fall
Carpentry
• Concrete volume — slabs, footings, columns, steps, with bag counts
• Lumber framing — header span, joist span, rafter rise/run
• Stair calculator — rise, run, stringer
• Board feet
CODE REFERENCE
• 20+ NEC, IPC, IRC articles
• Offline. Searchable. No subscription required.
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
App activity, App info and performance, and Device or other IDs
Data is encrypted in transit
You can request that data be deleted
What’s new
Minor navigation improvements.
App support
About the developer
Zhelyazko Zhelev
zzhelev+googleplay@gmail.com
zh.k. Mladost 1, block 18, entrance 4
floor 8, apartment 24
1750 Sofia
Bulgaria