OhmQuill app icon

For electricians and learners checking electrical job calculations

OhmQuill

Keep core electrical calculations ready for the job.

Work through wire size, ampacity, voltage drop, Ohm's law, conduit fill, and takeoff calculations in one place.

Download on the App Store Get it on Google Play

What OhmQuill brings together

An offline electrical and workshop bench for component codes, wire sizing, threads, solar sizing, and unit and material math.

Six modules: resistor and SMD code decoder with a parts bin and saved projects, wire gauge, ampacity and voltage drop, trade unit conversion with mixed-unit job rollups, tap drill and thread pitch with a fastener library, solar array, inverter and battery sizing with a payback estimate, and cost-per-unit comparison for shop supplies.

Explore product details

Ohm's law check

Calculate resistance and power from voltage and current. This helper runs only in this browser and does not save entered values.

Enter values, then select Calculate.