Lien - Trades Calculator
Electrical / Plumbing / HVAC
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
18 trade calculators — electrical, plumbing, HVAC, carpentry. Offline, with projects + PDF export.
Every trade calculation. One app. Forever offline.
Lien bundles the everyday calcs that electricians, plumbers, HVAC techs, and carpenters reach for on the truck — in a clean, fast iOS app that works without signal.
WHAT'S INSIDE (18 calculators)
- Electrical (6): wire size, voltage drop, conduit fill, box fill, motor FLA, service load.
- Plumbing (4): friction loss, fixture units, drain size, water-heater sizing.
- HVAC (4): BTU sizing, duct size, SEER cost, composite R-value.
- Carpentry (4): cut list, beam span, rafter, stairs.
MORE THAN A CALCULATOR
- Save calculations and group them into named Projects, then export a clean PDF for the inspector or the client.
- Reference tables bundled offline: NEC ampacity, conduit fill, pipe sizing, R-values, fastener guide.
- Pick your code region (US NEC, UK BS 7671, AU/NZ AS 3000); tables and formulas calibrate to it.
- 100% on-device. No accounts, no cloud, no data sync. Built dark-mode-first for job-site readability.
FREE TIER
- The full Electrical trade (6 calculators) and up to 3 saved calculations — free, forever.
LIEN PRO (auto-renewing subscription)
- Unlocks all 4 trades (18 calculators), unlimited saved calculations, and Projects with PDF export.
- $9.99/month or $59.99/year (about 3 months free on the yearly plan).
- Payment is charged to your Apple Account at purchase confirmation. The subscription renews automatically for the same price and period unless you turn off auto-renew at least 24 hours before the end of the current period. Manage or cancel anytime in Settings > Apple Account > Subscriptions.
DISCLAIMER
Lien is a calculator. Always verify results against the current local code in force (NEC, IPC, IMC, IBC, or the regional equivalent). Lien is not a licensing or certification authority.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://lien.uptrail.ai/privacy
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Mitaanshu Agarwal, 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 Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Mitaanshu Agarwal
- Size
- 4.5 MB
- Category
- Utilities
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - iPad
Requires iPadOS 18.0 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- LienTradesCalculatorMonthly $9.99
- Lien - Trades Calculator Pro Yearly $59.99
- Copyright
- © 2026 Toolbelt