Observed arrival · 2026-09-30
TradeCalcs: job-site calculators for electrical and HVAC work
A free collection of electrical and HVAC calculators for tasks including voltage drop, wire sizing, conduit fill, duct sizing, and load estimates.
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- Electricians and HVAC technicians checking field calculations
- Worth noticing
- The voltage-drop tool flags results near the limit and notes that its K-factor method assumes about 75 °C conductor temperature.
Field notes
The voltage-drop calculator accepts single-phase/DC or three-phase inputs, copper or aluminum conductors, and a selectable drop target. It displays a wire-size table with volts lost and percentage drop, plus pass/fail marks. The page says its K-factor method assumes about 75 °C conductor temperature, and cautions that the 3% branch and 5% total figures are informational targets rather than enforceable limits.
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