How to Check Suction Power on a Budget Cordless Vacuum: Just 3 Numbers
When you're shopping for an inexpensive cordless vacuum, look at the AW (air watts) figure first. If AW isn't listed, fall back on Pa (pascals) and motor rpm. The catch: cheaper models tend to splash a huge Pa number across the page, and Pa is a pressure measured with no airflow — which can be quite different from real cleaning performance. Below is a breakdown of what each unit means and how not to get fooled by marketing copy.
Suction units: what's the difference?
| Unit | What it means | Notes |
|---|---|---|
| AW (air watts) | The actual work done pulling air in | Reflects both pressure and airflow, so it's closest to how strong the vacuum feels |
| Pa (pascals) | Vacuum pressure with the inlet sealed | Easy to make look impressive. Tells you nothing about airflow |
| kPa | 1,000 pascals | Just a different label — same property as Pa |
| rpm | Motor speed | Higher is generally better, but fan and airflow-path design change the outcome |
| W (watts) | Power consumption | This is electricity used, not suction |
The key point: you can't compare Pa and AW on the same scale. There's no fixed conversion between them. Looking at a spec sheet alone, you simply can't say whether "20,000Pa" or "150AW" is stronger.
1. If AW is listed, go by AW
When comparing products from the same brand and generation, AW is a fairly honest indicator. For household stick vacuums, here's a rough sense of the ranges:
- Around 20–40AW: light duty — crumbs and dust. Fine for cars or as a secondary vacuum
- Around 60–100AW: solid as a main vacuum for hardwood and vinyl flooring
- Around 100AW and up: for homes with carpet, rugs or pet hair
These ranges shift depending on the product and testing conditions, so treat them as a reference point, not an absolute standard. Check the manufacturer's detailed specs before you buy.
2. If only Pa is listed, read it like this
Most budget product pages show nothing but Pa. When that's the case, here's what to check alongside it.
- Confirm whether it's the max-mode figure — it almost always is. And turbo mode typically drains the battery in 8–15 minutes.
- Look at runtime in standard mode too — strong suction means nothing if you get three minutes before recharging.
- Dustbin capacity and filter design — a clogged filter can cut you to less than half the advertised suction. Check whether the filter is washable.
3. More telling than the spec sheet: the head and the weight
How well a vacuum actually cleans depends as much on head design as on motor power.
- Motorized brush head or not: if the brush inside the head spins under its own power, hair and fine dust pickup is noticeably better. Some budget models have a brush that just rolls passively.
- How well the head seals to the floor: a head that hugs the floor loses less suction.
- Weight: past about 1.5 kg (3.3 lb), your wrist starts to complain and you simply vacuum less often. For actual hygiene, a light vacuum you run frequently wins.
4. Marketing phrases to ignore
- "200W suction" — W is most likely power consumption or motor output. It is not a unit of suction.
- Emphasis on "maximum suction" alone — without a runtime figure, it's only half the story.
- "Powerful cyclone" — that's a dust separation method, unrelated to suction numbers.
- Comparison charts with no source — bar graphs with competitor names blurred out have no verifiable basis.
5. Simple tests you can run at home
Things to try while you're still inside the return window.
- The A4 paper test: remove the head, hold a sheet of paper against the inlet and see whether it sticks.
- Rice grain / baking soda test: scatter a small amount on the floor and see whether it gets sucked up in one pass or pushed around by the head.
- Back and forth on carpet: if you have a rug, check whether the head lifts it. Too much suction actually makes it hard to push.
- Time the battery yourself: run it in standard mode with a timer and measure the real runtime.
6. Realistic expectations by price
- Under ₩100,000 (roughly $75): secondary or in-car use. Underwhelming as your main vacuum
- ₩100,000–200,000 (roughly $75–150): a motorized head plus 25+ minutes in standard mode is a passing grade
- ₩200,000–300,000 (roughly $150–225): worth aiming for a removable battery, ideally with a spare included
Pay particular attention to whether the battery is removable. Batteries are consumables and will need replacing in two or three years — if it's built in, you throw away the whole unit. Over the long run, this is the single biggest cost difference.
Key takeaways
- If AW is listed, look at AW first. If not, read Pa together with standard-mode runtime.
- Pa and AW don't convert to each other, so never compare across units.
- W (watts) is a unit of power, not suction.
- A motorized brush head and light weight make the biggest difference to how well it cleans in practice.
- Whether the battery is removable determines your long-term running costs.
Frequently asked questions
Q. Does 20,000Pa mean it's stronger than a Dyson? You can't compare them directly. Pa is pressure measured with the inlet sealed, while AW accounts for actual airflow — they're different properties. Only compare products listed in the same unit.
Q. My suction is getting weaker. Is it broken? Usually it's a clogged filter or a full dustbin. Empty the bin, rinse the filter, let it dry completely (at least 24 hours) and reinstall it. Clearing hair wrapped around the brush helps a lot too. If it still doesn't improve, have it checked at a service center.
Q. Can a budget model work as my main vacuum? For a studio or small apartment with mostly hardwood or vinyl flooring, often yes. But if you have carpet or pets, go with a model that has a motorized head.
The ranges and price brackets above are general reference points and will vary by product and testing conditions. Check the manufacturer's official specs and current pricing before you buy.