Practical energy math, made clear
Know what your power system can really do.
Free calculators for generator sizing, electrical conversions, battery runtime, and solar planning. Built around visible assumptions and useful answers.
A better starting point
Inputs you can see. Results you can check.
Choose a starting point
Tools for the job at hand
Generator Tools
Plan capacity, loads, fuel use, and runtime with clear headroom.
4 calculators
Electrical Tools
Convert watts, amps, volts, energy, and cost without hidden assumptions.
6 calculators
Battery Tools
Estimate usable energy, runtime, capacity, and charging time.
5 calculators
Solar Tools
Plan solar array size, battery capacity, charging time, and inverter requirements.
4 calculators
Built for clarity
No mystery numbers.
Every result keeps the formula, assumptions, and units close by. Defaults are estimates, and editable wherever real-world equipment varies.
Use these tools to plan and compare. Always confirm equipment requirements with manufacturer documentation and a qualified professional.