Calculation audit
See the exact power, schedule, cycle frequency or annual figure used to reach the result.
OneFreePlace · Tool #149
Measure energy use, not just watts on a label.
Convert power and schedules into kWh, model per-cycle equipment, use annual EnergyGuide-style figures directly, or build a whole equipment inventory. Separate active and standby energy, reveal continuous average power and load factor, compare an efficient replacement, and reverse-plan an annual energy budget.
✓ Power schedule✓ Per-use / cycle energy✓ Annual-label mode✓ 10-load inventory✓ Reverse energy budget
Energy Consumption Calculator
schedule · cycle · annual label · portfolio · efficiency
Consumption model
Use the input that best matches what you actually know.
Power + scheduleBest when you know running watts and a realistic schedule. Standby is applied whenever the load is not actively drawing the entered running power.
Efficiency / replacement comparisonOptional. Compare the current annual result with another model, retrofit or target without introducing electricity-price assumptions.
Power schedule: annual kWh = active energy + standby energy. Active energy uses running power × scheduled hours × duty cycle × quantity.
Annual energy
Calculating—
estimated annual electricity consumption
Enter valid energy-use inputs.
Average month—annual ÷ 12
Average day—annual ÷ 365.25
Continuous average power—annual energy spread across 8,766 hours
Active / standby—energy source split
Equivalent energy—MWh · MJ · Btu
Comparison / budget—optional efficiency analysis
Planning estimateMeasured kWh is preferable when the device cycles or changes power dynamically.
Efficiency comparison
Compare annual energy, percentage reduction and multi-year kWh difference without mixing energy use with electricity price.
Consumption breakdown
Power and cycle modes separate active/use energy from standby. Portfolio mode shows each load's annual share.
| Load / component | Annual kWh | Share | Average W | Notes |
|---|
Energy conversions
Useful when a specification is written in Wh, MWh, megajoules or Btu instead of kWh.
Schedule diagnostics
Power mode reveals equivalent full-power hours and load factor. Cycle and label modes show the frequency assumptions behind annualization.
What can improve accuracy?
Use measured kWh when possibleFor cycling and variable-speed devices, a smart plug, submeter or standardized annual-energy figure can beat a nameplate-watt estimate.
Best inputDo not confuse output capacity with electrical inputCooling BTU/h, motor horsepower, heat output and charger output are not automatically the wall-plug watts consumed.
Check labelInclude low-power statesStandby, sleep and always-on electronics can add meaningful annual energy because they operate for many hours.
8766 h/yeari
Annual-label mode is intentionally separate from power-schedule mode.Standardized labels and product listings may already account for cycles, test procedures and standby assumptions. Rebuilding them from maximum watts can make the estimate worse, not better.