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Power-to-Weight Ratio Calculator — result sheet
Compare a machine or vehicle's power with its mass in W/kg, kW per metric tonne, and horsepower per metric tonne.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Specific power = power/mass; W/kg = 1,000×kW/kg; kW per tonne = 1,000×kW/kg; hp per tonne = W/kg×1,000/745.699872.
Power-to-weight ratio normalizes output by mass so differently sized systems can be compared on a common basis. It is not the same as acceleration, which also depends on gearing, traction, drag, grade, and losses.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Power — kW; minimum 0; maximum 1000000000
- Mass — kg; minimum 1.0E-6; maximum 1000000000
Worked example
| Input | Value |
|---|---|
| Power | 100 |
| Mass | 1000 |
Specific power = 100 W/kg = 100 kW/t ≈ 134.10 hp/t.
Assumptions and limits
- Power is the same type of output for both systems being compared and is entered in kilowatts.
- Mass is the relevant operating mass in kilograms.
- Transmission efficiency, traction, aerodynamic drag, and duty cycle are not modeled.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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