Which cordless vacuum has the strongest suction?

Quoted suction for popular models

These are maker figures from Amazon UK listings or the makers' own published specs, all in the highest power mode. Figures in different units cannot be compared directly.

Why the numbers are hard to compare

Air watts combine airflow and suction pressure, but each maker measures under its own conditions. Watts sometimes describe suction power and sometimes motor input power. Pascals describe pressure only. A higher number in one unit does not mean a machine beats another quoted in a different unit.

Even within air watts, a figure measured at the motor differs from one measured at the floor head. Our air watts explainer explains the units in more detail.

Why the floor head matters

On carpet, the brush bar does much of the work. A strong motor with a weak head can clean worse than a moderate motor with a well-designed head that drives bristles into the pile. Heads that seal well to the floor also make better use of the suction available.

On hard floors, a soft roller or a well-sealed head picks up fine dust with modest suction. Very high suction can even make a head stick to smooth floors. Our Dyson heads explainer covers head types.

Suction you actually use

Top figures apply only in Boost or max mode, which runs the battery down in minutes. Most cleaning happens in eco or auto, where suction is much lower. A machine that cleans well in its normal mode is more useful than one that only impresses on Boost.

Automatic modes help by raising suction only where needed, on carpet or when the sensor detects more dirt. Our V15 power modes explainer shows how one system works.

When high suction is worth paying for

High suction helps most on deep carpet, rugs and homes with heavy pet shedding. It also helps in handheld mode on upholstery and car seats, where there is no motorised head on some tools.

If your home is mostly hard floor, a mid-range machine with a good soft roller often cleans just as well. Our carpet guide lists strong performers for carpeted homes.

Best cordless vacuums for carpet →

Keeping suction strong

Suction falls when the bin is full, filters are clogged or something is blocking the airflow. Empty the bin before it reaches the MAX line, wash filters as the manual says, and check the wand and head for blockages. A well-maintained mid-range stick often outperforms a neglected flagship.

Our lost suction article works through the checks.

How to choose by power

Use quoted suction as a rough guide within a brand, where figures are measured the same way. Across brands, look at the floor head, automatic modes, bin size and runtime alongside the number.

Our best cordless vacuums guide and pet hair guide weigh suction alongside the rest.

Suction and noise

Higher suction usually means more noise. Most sticks are noticeably louder in Boost than in eco, and some flagship models are loud enough in their top mode that you will not want to use it for long. If you vacuum early in the morning or late at night, a machine that cleans well in its quieter modes is more useful than one that relies on Boost.

Listings sometimes give a decibel figure. Compare figures from the same brand where you can, and remember that the sound of a brush bar on hard floor adds to the motor noise.

Frequently asked questions

Which Dyson has the best suction? On Dyson's figures, the Gen5 Detect at 280 AW, ahead of the V15 Detect at 230 AW.

Is more suction always better? No. The floor head, seal and automatic modes matter as much, and very high suction is only available in Boost.

Can I compare air watts with watts? Not directly. They measure different things.

Why does my vacuum feel weaker over time? Usually a full bin, clogged filter or blockage. Battery wear can also reduce runtime in high modes.