⚡ Electrical, HVAC & Solar Calculators
Size electrical projects safely. Estimate the right generator wattage for your appliances, pick wire gauges, plan circuits, and estimate HVAC and solar needs. Where safety matters, we always recommend confirming with a licensed electrician.
AC BTU Calculator
The right air conditioner size in BTU and tons for your room.
🔌Generator Size Calculator
Size the right generator from your appliances' running and starting watts.
🧵Wire Gauge (AWG) Calculator
Pick the right AWG wire size by amps, length and voltage drop, with a NEC ampacity check.
Frequently asked questions
How do I size a generator?
Add up the running watts of everything you want to power, then add the highest starting-watts surge among motor-driven appliances. Our generator size calculator walks through it step by step.
Can I wire my house myself based on a calculator?
Calculators help you plan, but electrical work must meet local code — hire a licensed electrician for installation.
What are starting watts vs running watts?
Motor appliances like fridges and pumps draw a short surge (starting watts) when they kick on, then settle to lower running watts. Generators must handle the surge.