Kg/h to kW Calculator

Convert mass flow rate to power using energy content and efficiency. Calculate boiler output, fuel consumption, and thermal power for engineering applications.

Mass Flow to Power Converter:

Kg/h measures mass flow, kW measures power. This calculator uses energy content (kJ/kg) and efficiency to convert between them.

Kg/h to kW Converter

Flow rate of fuel or steam

Calorific value or enthalpy difference

50% 100%
%
Formula: kW = (kg/h × kJ/kg × Efficiency) ÷ 3600

Calculation Results

⚡

Enter mass flow and energy content

then click "Calculate" for power

What is a Kg/h to kW Calculator?

Converting kilograms per hour into kilowatts is common in thermal systems, boilers, and fuel consumption calculations. However, kg/h alone does not determine power. You must know how much energy each kilogram carries.

That energy value is usually expressed in kilojoules per kilogram (kJ/kg). For fuels, this is called calorific value. For steam, it's the enthalpy difference. Once you know this, the calculation becomes straightforward.

Formulas Used in This Calculator

Basic Power Formula
Power (kW) = (kg/h × kJ/kg) ÷ 3600
Why 3600? Because 1 hour = 3600 seconds, and 1 kW = 1 kJ/sec.
With Efficiency
Power (kW) = (kg/h × kJ/kg × Efficiency) ÷ 3600
Efficiency entered as decimal (e.g., 0.85 for 85%)
Reverse Formula
kg/h = (kW × 3600) ÷ (kJ/kg × Efficiency)
Used to find fuel consumption for a required power output

Example Calculation

Problem: A diesel generator consumes 500 kg/h of fuel. Diesel has 42,000 kJ/kg energy. The engine is 85% efficient. What's the power output?
Step 1: Convert efficiency: 85% = 0.85
Step 2: Calculate: (500 × 42,000 × 0.85) ÷ 3600
Step 3: 17,850,000 ÷ 3600
Result: 4,958.33 kW (~5 MW)

Kg/h to kW Reference Table

Here's a reference table showing various mass flow to power conversions:

Mass Flow Fuel/Steam Energy Efficiency Power (kW)
100 kg/h Diesel 42 MJ/kg 90% 1,050
250 kg/h Natural Gas 48 MJ/kg 85% 2,833
500 kg/h Diesel 42 MJ/kg 85% 4,958
500 kg/h Coal 24 MJ/kg 80% 2,667
1000 kg/h Natural Gas 48 MJ/kg 90% 12,000
2000 kg/h Fuel Oil 40 MJ/kg 85% 18,889
3000 kg/h Coal 24 MJ/kg 75% 15,000
5000 kg/h Diesel 42 MJ/kg 88% 51,333
500 kg/h Steam (Sat.) 2.7 MJ/kg 95% 356
1000 kg/h Steam (Super.) 3.2 MJ/kg 92% 818
200 kg/h Propane 37 MJ/kg 90% 1,850
150 kg/h Gasoline 44 MJ/kg 85% 1,558
800 kg/h Natural Gas 48 MJ/kg 88% 9,387
1200 kg/h Diesel 42 MJ/kg 90% 12,600
3500 kg/h Coal 24 MJ/kg 82% 19,133
750 kg/h Fuel Oil 40 MJ/kg 87% 7,250
400 kg/h Propane 37 MJ/kg 92% 3,786
6000 kg/h Natural Gas 48 MJ/kg 90% 72,000
2500 kg/h Diesel 42 MJ/kg 86% 25,150
1500 kg/h Coal 24 MJ/kg 78% 7,800
Pro Tip:

Efficiency varies significantly between systems. Modern gas turbines can reach 40-60% efficiency, while steam boilers typically operate at 80-90%. Always check manufacturer specifications for accurate calculations.