Can you compare pascals to air watts?

No, and any chart that converts between them is inventing a relationship that does not exist. Pascals measure static pressure — how hard the machine pulls against a sealed opening. Air watts combine pressure with airflow, so they describe useful work at the nozzle. A machine can post a high pascal figure with almost no airflow, which cleans poorly. Compare pascals only to pascals within the same category, which in practice means robots, and air watts only to air watts.

Do amps or motor watts tell you anything?

They tell you what the machine consumes, not what it delivers. A 12 amp upright draws 12 amps at the wall whether the airway is efficient or blocked. Manufacturers use input figures because they are large and impressive, and because they require no standard test to produce. Treat motor watts and amps as an indication of size only, and look for air watts, water lift or a published cleaning performance figure if you want something meaningful.

Why does my high-suction vacuum clean carpet badly?

Because carpet cleaning is mostly agitation, not suction. Embedded grit is held in the pile by friction and has to be knocked loose by a rotating brush before airflow can carry it away. A powerful suction motor with a passive floor head will pull surface litter and leave the rest. This is why a motorized brush head matters more than a suction figure on carpet, and why the same machine performs very differently with its two included heads.

Does more suction damage floors or rugs?

Suction itself rarely does, but the brush roll can. A stiff bristle brush at high speed can fuzz loop-pile carpet and scratch soft hardwood or luxury vinyl, which is why hard-floor heads use soft rollers and why most machines let you switch the brush off. On delicate or hand-knotted rugs, use a suction-only tool. High suction can also seal a machine to a lightweight rug and lift it, which is a nuisance rather than damage.

Is sealed suction the number I should look for?

It is the most useful figure most brands do not publish. Sealed suction, or water lift, is measured in inches of water and describes how hard the machine can pull with the airway blocked — it predicts how well a vacuum digs debris out of carpet rather than skimming it. Where it is published, upper 70s to 100 inches is strong for a household machine. Where it is not, a sealed-system claim plus a good motorized head is the practical substitute.

What Is a Good Suction Power for a Vacuum? (100+ Air Watts)

Written & researched by Derek Holt Home & Appliances Editor

Updated October 2026

Low-angle view of a person vacuuming a living room rug, in soft early-morning light

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For a cordless stick vacuum look for 100 air watts or more on its standard setting; for a corded upright or canister, 150 to 200 air watts; for a robot vacuum, at least 2,500 pascals on hard floors and 4,000 or more if you have carpet or pets. The important caveat is that these units measure different things and cannot be converted between each other. Air watts describe useful work at the nozzle, pascals describe static pressure, and the amps or motor watts on the box describe electricity consumed, which tells you nothing about cleaning at all.

What do the different suction numbers actually mean?

Four figures appear on packaging, and only two of them relate to cleaning.

Figure	What it measures	Useful?
Air watts (AW)	Airflow combined with suction pressure at the nozzle	Yes — the best single figure
Pascals (Pa)	Static pressure against a sealed port	Yes, but only to compare robots
Water lift, in inches	Sealed suction — how hard it pulls when blocked	Yes, predicts deep-carpet performance
CFM, cubic feet per minute	Airflow volume	Yes, best read alongside water lift
Motor watts	Electricity consumed	No
Amps	Current drawn at the wall	No

The reason the input figures persist is that there is no legally required suction standard for household vacuums in the US, so brands choose the number that flatters them. Air watts and water lift require an actual measurement of output; amps do not.

Wide view of a person vacuuming a living room rug, in soft overcast light

What figures should you aim for?

Practical targets by machine type and floor. Treat the low end as adequate and the high end as comfortable.

Machine	Hard floors	Low pile	Deep pile or pets
Cordless stick (air watts)	40–80 AW	100–150 AW	180 AW or more
Corded upright (air watts)	100 AW	150 AW	200 AW or more
Canister (air watts)	150 AW	200 AW	250 AW or more
Robot (pascals)	2,500 Pa	4,000 Pa	6,000 Pa or more
Handheld (air watts)	20–40 AW	Not suited	Not suited

Note the gap between a stick vacuum on its boost setting and on its normal one. Boost figures are what appear in marketing, and they typically run for only a few minutes before the battery drops — which is why the runtime figures in how long a cordless vacuum battery lasts should be read next to the suction claim.

Golden-hour view of a person vacuuming a living room rug

What matters more than suction?

Three things, and on carpet they matter considerably more.

Brush agitation. Embedded grit is held by friction in the pile and has to be mechanically loosened before airflow can remove it. A motorized brush roll is the difference between cleaning carpet and skimming it, which is why a mid-suction machine with a good head beats a high-suction one with a passive nozzle.
A sealed airway. If air leaks in around a bin lid, a filter housing or a hose joint, the suction at the nozzle is lower than the motor is capable of and fine dust escapes back into the room. Sealed-system claims matter to anyone with allergies, since a HEPA filter in a leaky body does very little.
Nozzle and head design. Head width, wheel height, edge cleaning and how well the seal follows an uneven floor decide how much of the motor output reaches the dirt.

Airflow also collapses as filters load, which is why the maintenance in how to clean a vacuum filter restores more suction than any upgrade. For carpeted homes the shortlist is best vacuum for deep pile carpet, for hard floors best vacuum for hardwood floors, and the overall picks are in our vacuum cleaner picks.

We never buy, test or physically handle the products we rank. Every recommendation comes from aggregated owner reviews, star ratings, review volume and published expert consensus — see how we rank.

What Is a Good Suction Power for a Vacuum?

Affiliate Disclosure

What do the different suction numbers actually mean?

What figures should you aim for?

What matters more than suction?

Frequently Asked