About CalcMyPower
High-utility, technically rigorous US electrical, solar, battery backup, and generator sizing calculators built for homeowners, off-grid builders, and field technicians.
Our Publishing Mission
Electrical sizing tools on the modern web are too often buried under generic AI filler or obscured behind black-box marketing forms. CalcMyPower was established to provide transparent, mathematically verified engineering calculators that publish their formulas, assumptions, and physical constraints openly.
Our interactive tools execute client-side in your web browser. You receive immediate answers, interactive sliders, worked examples, and actionable electrical guidelines without paywalls or equipment harvesting.
Engineering Methodologies and Standards
Every calculator formula and editorial guideline is grounded in authoritative US technical bodies:
All circuit breaker sizing models incorporate the mandatory 125% continuous-load safety factor (Articles 210.19, 215.2, and 690.8). Sizing guides reference conductor ampacity tables and 3% voltage drop recommendations.
Battery storage calculations follow IEEE Std 485 and Std 1013 sizing principles, incorporating chemistry-specific Depth of Discharge (DoD) limits and Peukert discharge rate warnings for lead-acid and lithium cells.
Solar array sizing formulas utilize solar irradiance data and derate methodologies modeled on National Renewable Energy Laboratory (NREL) PVWatts benchmarks and Sandia National Laboratories research.
Appliance energy estimates and utility cost calculators draw on baseline electrical consumption studies from the U.S. Department of Energy and average state electric tariffs from the Energy Information Administration.
Our Core Publishing Principles
1. Calculator-First Utility: Interactive tools are our primary product. Sizing guides and technical articles exist to explain mathematical methodologies and practical safety rules, not to inflate word counts.
2. Transparent Baseline Assumptions: We never hide derating factors. When we assume 85% inverter conversion efficiency, a 0.80 power factor, or a 90% LiFePO4 depth of discharge, the assumption is explicitly labeled and configurable.
3. Independent Engineering Integrity: We do not accept sponsored calculator modifications or alter sizing outputs to favor particular manufacturers or hardware brands.
4. Safety and Preliminary Planning Disclaimers: Sizing calculations are theoretical planning tools. Because physical wiring involves fire and life-safety hazards, we always urge users to verify designs with a licensed electrician or professional engineer.
Have Feedback or a Calculation Correction?
We welcome peer review from master electricians, electrical engineers, and solar installers.