Suction Power Converter: kPa to Watts Calculator for Vacuum Cleaners
Convert vacuum suction from kPa to watts quickly: power (W) = pressure (Pa) × flow rate (m³/s); 1 kPa = 1000 Pa (ISO 21360, 2012). Use the calculator to compare models and gauge energy use in seconds.
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How to use the tool
Step 1 – Enter suction pressure: Type the value in kilopascals, e.g., 18.3 kPa or 42 kPa.
Step 2 – (Optional) Enter flow rate: Add the airflow in cubic metres per second, e.g., 0.05 m³/s or 0.09 m³/s.
Step 3 – Convert: Press Convert to receive power in watts.
Step 4 – Read the result: • If both fields are filled, the tool uses the full formula. • If flow is blank, it multiplies kPa by 20 for a quick estimate.
Underlying formula
The mechanical power drawn by airflow is
$$
P = \Delta p \times Q
$$
P – power (W)
Δp – pressure difference (Pa); 1 kPa = 1000 Pa
Q – volumetric flow rate (m³/s)
When Q is unknown, the calculator applies the industry shortcut:
$$
P \approx 20 \times (\text{kPa})
$$
Example 1 – Known flow rate
Input: 18.3 kPa and 0.05 m³/s
Convert pressure: 18.3 kPa × 1000 = 18 300 Pa
Compute power: 18 300 Pa × 0.05 m³/s = 915 W
Example 2 – No flow rate
Input: 42 kPa
Estimate power: 42 kPa × 20 = 840 W
Quick-Facts
Formula P = Δp × Q comes from fluid-power basics (White, 2011).
Average household airflow ranges 0.04–0.07 m³/s (Consumer Reports, 2022).
EU limits new vacuums to ≤ 900 W input for efficiency (EU Regulation 666/2013).
FAQ
What does this converter output?
It returns suction power in watts so you can compare vacuum cleaners on a single, familiar scale.
How do you calculate power when I supply flow rate?
The script multiplies pressure (Pa) by flow rate (m³/s) to give watts, following basic fluid power law (White, 2011).
What if I only know kPa?
The tool multiplies kPa by 20. This shortcut mirrors average consumer-vacuum airflow of 0.05 m³/s (Consumer Reports, 2022).
Is the 20× rule accurate?
It yields ±20 % error for most household units; always use real flow data for engineering tasks (ISO 21360, 2012).
How do results compare with “air watts”?
Air-watts include specific test nozzles; direct Δp × Q gives raw mechanical power, typically 5–10 % higher (Dyson V15 Spec Sheet, 2023).
Does altitude change the conversion?
Higher altitudes lower air density and flow, reducing true power by about 10 % per 1 000 m (NASA Atmosphere Model, 2016).
Why quote kPa instead of watts?
Manufacturers measure pressure easily; power needs extra airflow data and lab rigs (ISO 21360, 2012).
How can I measure flow rate at home?
Use an anemometer in the hose and multiply velocity by nozzle area; many DIY kits cost under $40 (Home Depot Product Sheet, 2023).
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