Calculate system efficiency, input power, output power, and energy losses for engineering applications.
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Enter Input Power and Output Power
Choose whether to calculate efficiency, input power, or output power based on what values you know and what you need to find.
Input the measured or specified power values for your system. Ensure you use consistent units (Watts) for accurate results.
The calculator uses η = Pout/Pin to determine the efficiency ratio. Output power cannot exceed input power.
The result is automatically converted to percentage format for easy interpretation and comparison with industry standards.
Review the calculated losses (Ploss = Pin - Pout) to understand energy waste and identify optimization opportunities.
Compare your results with typical efficiency values for similar systems to evaluate performance and identify improvement potential.
Excellent performance indicating minimal energy waste. Common in modern electric motors, LED lighting, and well-maintained systems.
Acceptable performance for many applications. Consider optimization opportunities if operating costs are significant.
Poor performance indicating significant energy waste. Common in older systems, internal combustion engines, or systems needing maintenance.
Extremely poor performance. System may be malfunctioning, improperly sized, or using outdated technology. Immediate attention recommended.
Compute η, input, output, and losses. Use it for quick checks and benchmarking against typical ranges.
Compute efficiency, loss, and improvement targets for systems and processes.
η = output / input.
See wasted portion and potential gains.
Track improvement goals.
Efficiency calculator percent loss
Important: This efficiency calculator is designed for educational and preliminary performance analysis purposes using standard efficiency definitions and basic input/output relationships. While calculations are mathematically straightforward, actual efficiency measurements are highly context-dependent and require careful consideration of measurement methods, operating conditions, system boundaries, and instrumentation accuracy. For professional efficiency analysis, energy audits, equipment specification, or performance optimization, use calibrated instruments, follow established measurement protocols, and consult qualified engineers who can ensure accurate measurements and proper interpretation of efficiency data for your specific system and operating conditions.