Amp to Wire Size Calculator
Convert amps to a suggested wire gauge with typical ratings.
Electrical Calculators
Electrical calculators with clear outputs and validation for fast estimating.
These electrical calculators handle the everyday sizing and reference work pros and DIYers need: wire and conduit sizing, voltage drop, load, and breaker selection. Lookups follow published NEC tables and results show clear pass/fail and percentage outputs. Always confirm against the current NEC edition adopted in your jurisdiction before any installed work.
Box Fill Calculator
Estimate quantities and get instant results with unit conversion and waste adjustments.
Breaker Size Calculator
Estimate breaker size from load with basic sizing assumptions.
Cable Tray Fill Calculator
Estimate cable tray fill and compare against common fill limits.
Conduit Fill Calculator
Estimate conduit fill percentage and compare against common fill limits.
Electrical Load Calculator
Estimate electrical load from connected wattage and circuit values.
Generator Size Calculator
Find the right generator size in watts and kilowatts based on your appliance loads and surge requirements.
Ohm's Law Calculator
Estimate quantities and get instant results with unit conversion and waste adjustments.
Voltage Drop Calculator
Calculate voltage drop by distance, load, and wire size. Shows percent drop.
Watts Amps Volts Calculator
Convert between watts, amps, and volts using standard formulas.
Wire Size Calculator
Get a wire gauge recommendation based on amperage and conductor type.
Frequently Asked Questions
What electrical calculators are available?
Wire size, voltage drop, conduit fill, electrical load, breaker size, amp-to-wire-size, watts/amps/volts, cable tray fill, and Ohm's law.
Are the results based on the NEC?
Yes. Ampacity, conduit fill, and related lookups follow published National Electrical Code tables. Always verify against the current NEC edition adopted in your jurisdiction.
Can I use these for permitted electrical work?
Use them for planning and estimating only. Installed and permitted work should be designed and verified by a licensed electrician for code compliance.
Why does voltage drop matter?
Excessive drop causes poor performance and overheating. The NEC recommends keeping it to roughly 3% on a branch circuit and 5% total, which often drives larger wire on long runs.