Electrical calculators. Free, and actually finished.
- Available Now
Voltage Drop Calculator
Single and three phase, copper and aluminum, with temperature correction, ampacity check against NEC 310.16, and a conductor recommendation.
Open calculator - Available Now
Conduit Fill Calculator
EMT, RMC, IMC, and PVC checked against NEC Chapter 9 Tables 1, 4, and 5, with the smallest compliant trade size.
Open calculator - In Development
Feeder Sizing Calculator
Combined ampacity and voltage drop sizing with termination temperature limits and adjustment factors.
Not yet available - Planned
Transformer Calculator
Primary and secondary current, overcurrent protection per NEC 450.3, and conductor sizing either side.
Not yet available - Planned
Load Calculator
Service and feeder load calculations under NEC Article 220, with demand factors by occupancy.
Not yet available - Planned
Grounding Conductor Calculator
Equipment grounding conductor sizing per NEC 250.122 and grounding electrode conductor per 250.66.
Not yet available
Why these are free
VoltDrop started as a voltage drop calculator. The calculation engines underneath these tools are the same ones the platform uses — so keeping them open is both the honest thing to do and the clearest demonstration that the engineering claims are not decorative.
Every calculator shows its formula, its code references, and its limits. If a tool cannot do something, the page says so rather than letting you find out on a job.
Calculations connected to the rest of the job.
A calculator answers one question at a time. VoltDrop connects those answers to scope, runs, and material in a single project model.