Fast, no-nonsense calculators for your electricity bill, EV charging, appliances, and solar. Real formulas, your numbers, instant answers.
WattCruncher builds free, genuinely useful calculators for the questions people actually have about energy: what's driving my electric bill, how much does it really cost to charge an EV, is solar worth it on my roof, and what does that space heater cost to run all winter. Every tool uses transparent formulas and sensible 2026 defaults you can change to match your own bill and rates — no sign-ups, no gated results, no sales pitch.
Start with the EV Charging Cost Calculator if you drive electric, the Electricity Bill Calculator to understand your monthly power cost, or the Solar Panel Savings Calculator if you're weighing panels. See everything on the all tools page.