Handheld vacuums, and what the pascal number is actually measuring

A handheld vacuum is the tool for the job the big vacuum will not reach: the car, the sofa, the crumbs under the toaster, the stairs. Seventeen of them are on this page, and the titles have decided that one number is the whole story. It is not, and the number itself is worth understanding.

What a pascal number is

Five of these seventeen state a suction figure in pascals: 5,000, 13,000, 14,000 and two at 15,000, one of them written as 15kPa, which is the same thing.

The pascal figure is pressure. It is measured by sealing the inlet and seeing how hard the motor can pull against it, and it tells you how well the vacuum lifts something that is stuck or wedged: grit in a seat seam, sand in a footwell mat.

What it does not tell you is how much air moves when the inlet is open, which is airflow, and airflow is what carries dust out of carpet pile and hair off a sofa. The two numbers are independent. A tiny nozzle on a strong motor can post a high pascal figure and move a trickle of air, and that is exactly what a handheld is.

So read the pascal number as a floor, not a promise. A vacuum that states one has at least measured something. The twelve that state no figure have measured nothing they are willing to print, and half of them write powerful, high power or large suction in its place.

For scale, a mains upright vacuum pulls around 20,000 pascals and moves a great deal more air through a much bigger opening. The handhelds here are in the same pressure range and nowhere near the same airflow, which is why the honest job description for all of them is crumbs, grit and hair in small spaces.

Cordless, and the number nobody prints

Fifteen of the seventeen titles say cordless, wireless or rechargeable. That is the right design for a handheld, and it brings the one question that decides whether you use it: how long does it run.

No title here says. Two give a battery capacity, 1200mAh on one and 5200mAh on the air duster, and capacity is not runtime: it depends on how hard the motor pulls. A motor doing 15,000 pascals from a cell the size of a phone’s runs for minutes, not hours. Treat a handheld as a one-car, one-sofa tool that goes back on the charger, and buy it knowing that.

Two titles mention the charging socket, one saying USB and one Type-C. One says wireless charging, which on a vacuum means a dock. The rest leave you to find out which cable it wants when it arrives.

The one that says 1650W is a different machine. A wattage that high is a mains motor, and its title describes a wet and dry carpet cleaner that sprays water and pulls it back out. That is for a stain on a car seat or a rug, not for crumbs, and it is the only thing on this page that does that job.

Brushless, and why it is the word to look for

Two titles say brushless motor. That is not a suction claim. It is a statement about the motor’s design: no carbon brushes to wear, less heat, less battery lost to friction.

On a tool that lives on a battery and gets charged and drained twice a week, that is the difference between a motor that is still pulling in three years and one that is not. It is the one engineering word on this shelf that speaks to the life of the thing, and it costs the seller nothing to leave out, so where it is present it is worth weight.

The blower, and the one that blows first

Five titles here mention blowing: an air blower function, an inflator blower, an air duster. Blowing is what you want for the places suction cannot get into, a keyboard, a heater vent, the inside of a computer, a car’s air outlets.

One of the five is a different tool wearing the same clothes. The KOVA P80 is an air duster with a vacuum option: 120,000rpm, a 5200mAh cell, four speeds, and sold for cars, PCs and homes. It is the thing you buy instead of cans of compressed air, and if that is the job you have, it is the right purchase and the sixteen vacuums are not.

One title calls its blower an inflator. That is a blower with a nozzle; it will put air into a pool toy, and it is not a tyre inflator. The tyre inflator guide covers what does that job, and why it needs a pressure figure to be worth buying.

Filters, and pet hair

Two titles say washable and one of those says HEPA. Every handheld has a filter, every filter clogs, and a clogged filter is the most common reason a vacuum that was fine last month is weak this month. A washable filter is the running cost of the tool set to zero, and it is on two of seventeen.

Three titles mention pets or pet hair. Hair is the hardest thing a small vacuum does, because it wraps and clogs rather than falling into the cup. None of these titles says what tool head it comes with, and a head with a brush roll is the thing that actually deals with hair. If pet hair is the reason you are buying, that is the question to ask the seller before anything about pascals.

Car and home are the same product

Thirteen of these seventeen titles say car, and ten of those thirteen also say home. A handheld vacuum does not know where it is. What makes one better in a car is a crevice tool for the seat rails and a hose for under the seats, and not one title here says whether either is in the box.

One title says dust detection with a green light, which is a lamp on the nose that lights up dust on a dark surface so you can see what you have missed. It is a real convenience on a car floor and a gimmick on a worktop.

One says one-button dust dump, which means the cup opens from the bottom rather than being pulled apart. On a tool you empty several times per job, that is worth more than it sounds.

What the titles never say

Runtime. Not one of seventeen.

Weight. Two say lightweight, none says how light. You hold this at arm’s length for the whole job.

Dust cup volume. None. A cup that fills on the first footwell is a cup you empty three times per car.

Airflow. None, and it is the number that matters more than the one they do print.

Noise. None, and a small motor spinning fast is a loud thing in a closed car.

What I would actually do

For most people, the 120W handheld that states 15,000 pascals. It is the only title on this page that gives both a wattage and a pressure figure, and it says bagless and lightweight rather than powerful. Check the filter is washable before you order, because the title does not say.

If you want a brand whose parts and batteries you can buy for years, the Bosch GAS 12V-LI. It runs on the same 12V battery as Bosch’s small drills, which is useful if you own one and expensive if you do not, because Bosch commonly sells the vacuum body-only. The title does not say whether a battery is in the box. Ask.

For the glovebox, the Airo pocket vacuum at 14,000 pascals. It is sold as what it is.

And for a desk, a PC or a car’s air vents, the KOVA air duster. It blows first and sucks second, and for that job the order is right.

Whichever you buy, the pascal number tells you it will lift grit. The numbers that are missing tell you how long, how heavy and how often you empty it, and those are the ones you will notice.