Newtons on a leaf blower rate the push of the air at the nozzle: more newtons means more force on a leaf, a stone or a wet mat. One newton is about a quarter of a pound of force, so a 48 newton backpack blower pushes with roughly 11 pounds.
Every November I clear wet plum leaves off a concrete pad and a gravel yard, and the newton figure is the one blower rating I convert to pounds before I trust it. Below you will find what a newton feels like, how to read the number on a box, ranges by blower class, what common yard jobs need, and what to do when a maker prints none.
What Do Newtons Mean on a Leaf Blower?
A newton rating is the force of the air jet at the nozzle. The newton (N) is the SI unit of force, equal to one kilogram meter per second squared (1). In the pound units most US buyers use, one pound of force equals 4.448 newtons (2), so 48 N is 10.8 pounds. Divide the newtons by 4.45 to get pounds, or multiply by about a quarter.
Force comes from two things: how much air leaves the nozzle each second and how fast it moves. A moving gas pushes in proportion to the mass it moves per second and the change in its speed (3), so one newton figure folds CFM and mph into a single number. According to Husqvarna, blowing force represents the overall pushing power of a blower, and for performance comparisons it is generally the more reliable indicator.
My guide on how CFM is defined and tested on a leaf blower covers that volume figure and how it interacts with speed before the force calculation.
Quick Conversion
Divide newtons by 4.45 to get pounds of force. A 12.5 N gas handheld pushes with about 2.8 pounds, a 26 N battery handheld with about 5.8 pounds and a 48 N gas backpack with about 10.8 pounds.
What One Newton Feels Like
One newton is the weight of about 100 grams, roughly a small apple. That makes 10 N the weight of a one liter bottle of water, and 48 N the weight of nearly five of them.
Use the comparison for scale only. A blower does not lift that weight: the figure is a push measured at the nozzle, and the jet pulls in the air around it as it travels (4), so the push on a leaf depends on how close you hold the nozzle.
| Newtons | Pounds of force | Kilograms of force | One liter water bottles |
|---|---|---|---|
| 10 N | 2.2 | 1.0 | about 1 |
| 20 N | 4.5 | 2.0 | about 2 |
| 30 N | 6.7 | 3.1 | about 3 |
| 40 N | 9.0 | 4.1 | about 4 |
| 50 N | 11.2 | 5.1 | about 5 |
US store labels rarely show the pound figure, so I do the conversion at the shelf. Seen in pounds, the gap between a 12 N gas handheld, under 3 pounds of push, and a 48 N gas backpack, nearly 11 pounds, is easy to judge.
How to Read a Newton Rating on the Box
Read the word next to the number first. Echo prints a row called “Newtons (N) at nozzle”, and Husqvarna prints “Max Blow force”. Both describe the top setting, so the printed force is a ceiling. The Echo DPB-2500 shows it plainly: its page lists “To 158 MPH, 549 CFM and 17 N” for the turbo button and gives no figure for normal mode.
What the Max Hides
The setting behind the number decides what you get day to day. According to EGO’s owner’s manual, the LB7654 has a maximum blowing force of 26 N. On the 5.0 Ah kit battery it pushes about 25 N on turbo and about 16 N on its high setting, a drop of more than a third. Runtime follows the same pattern: turbo lasts about 13 minutes on that battery and high about 22.
| Setting | Push | In pounds | Runtime on one charge |
|---|---|---|---|
| Turbo | about 25 N | about 5.7 lb | about 13 minutes |
| High | about 16 N | about 3.6 lb | about 22 minutes |
I ask three questions of any figure: which setting, which battery and which nozzle. A maker’s number belongs to one combination of the three, and a different combination gives a different push.
Even one model can carry two figures. Husqvarna’s current US page lists the 580BTS at 47 N, and Husqvarna’s older support page for the same model lists a lower one, so check which page a figure comes from. Compare newtons inside one maker’s lineup first, because no rule makes every maker rate its blowers the same way.
Typical Newton Ranges by Blower Class
Makers rate blowers across a wide band, from about 10 N on a light battery handheld to 56 N on the strongest gas backpack. The table groups ratings that makers print in their spec tables and manuals. The classes are my grouping, and no standard defines them.
| Class | Typical range | In pounds | Maker-rated examples |
|---|---|---|---|
| Light battery handheld | about 10 to 17 N | 2.2 to 3.8 lb | Echo DPB-2500 17 N on turbo; Husqvarna puts small-garden battery handhelds at often around 10 N |
| Gas handheld | 12.5 to 15.8 N | 2.8 to 3.6 lb | Husqvarna 125BVx 12.5 N; Echo PB-2520 15.8 N |
| Strong battery handheld | about 20 to 30 N | 4.5 to 6.7 lb | Husqvarna 230iB 19.6 N; Husqvarna 350iB 23.5 N on boost; EGO LB7654 26 N and EGO LB8803-2 30 N, both from EGO’s manuals |
| Battery backpack | 17 to 35 N | 3.8 to 7.9 lb | Husqvarna 340iBT 17 N; Husqvarna 570iBT 35 N |
| Gas backpack | 22 to 56 N | 4.9 to 12.6 lb | Echo PB-580T 22 N; Husqvarna 570BTS 37 N; Husqvarna 580BTS 47 N; Echo PB-9010T 48 N; Husqvarna 590BTS 56 N |
Where the Gap Sits
The gap that matters sits between the battery handhelds and the gas backpacks. A Husqvarna 590BTS rated at 56 N pushes more than twice as hard as a Husqvarna 350iB at 23.5 N on boost, and more than three times as hard as a light handheld such as the Echo DPB-2500 on turbo at 17 N. It also weighs 26.2 pounds, against 7.7 pounds for the Echo with its small battery, so the extra force costs weight on your body.
On the long orchard alleys I notice the difference most. A gas backpack covers a row in fewer passes than my old gas handheld did, and a well adjusted harness puts the load on my hips instead of my wrist.
How Many Newtons Common Yard Jobs Need
No standard sets a pass mark for a yard job. The bands below are my own working guide, built from the makers’ ranges above and from how the jobs on my land behave. According to Husqvarna, higher blowing force suits clearing wet leaves, and small gardens are well served by light battery handhelds, often with around 10 N.
| Job | Newtons I look for | In pounds | What I check first |
|---|---|---|---|
| Patio, deck, dry leaves on pavement | about 10 to 15 | 2.2 to 3.4 lb | Weight and runtime |
| Dry leaves on a lawn up to a quarter acre | about 15 to 22 | 3.4 to 4.9 lb | The CFM rating next |
| Wet leaves on pavement, pine needles on turf | about 22 to 30 | 4.9 to 6.7 lb | How many minutes the turbo or boost mode lasts |
| Wet mats on grass, half an acre to an acre, gravel yard, storm debris | about 35 to 48 | 7.9 to 10.8 lb | A backpack class tool and a low nozzle angle |
| Long orchard alleys and daily work on acreage | about 40 and up | 9.0 lb and up | Fuel or pack count for the total hours |
A wet mat of plum leaves on my concrete pad sorts blowers faster than any spec sheet. A light handheld on its everyday setting only slid the top layer across the concrete and left the rest stuck down. Low, steady air aimed under the leading edge worked where a high sweep failed, and that job is why I read the newtons of the boost mode and the minutes it lasts together.
Gravel Needs Less Throttle
Gravel is the stress test for a strong blower. More newtons sends stones off the yard faster, so on my gravel drive I drop the throttle and keep the nozzle low and flat instead of using the full push.
Mistakes That Cost Money
- Buying on the boost number. On a battery blower the top figure often belongs to a turbo or boost mode that lasts minutes, so read the minutes behind it.
- Judging by CFM alone. A thin, fast jet pushes little: 155 CFM at 160 mph works out to at most about 6 N, a patio tool.
- Mixing labs. A gas maker’s newtons and a battery maker’s newtons need not come from the same test, so compare them as a rough guide only.
Why Some Makers Publish Newtons and Others Do Not
Leaf blower newtons are easy to find on Echo and Husqvarna pages and harder to find on most battery brands. Both print the figure in the spec table. EGO puts its figure in the owner’s manual instead of on the product page. DeWalt’s page for the DCBL772X1 gives “up to 600 CFM of air volume at 125 MPH” and no force row.
Gas blower ratings often follow ANSI/OPEI B175.2, a standard for combustion engine handheld and backpack blowers that includes a blowing force measurement. The standard excludes electric units, so a battery maker prints a force only when it chooses to.
No maker says why it leaves the number off. My reading is a plain one: a printed force invites a meter, and a number with no required label is a number nobody has to defend.
What to Do When the Box Has No Newtons
Three routes work, and they go in this order.
- Open the manual. Some makers, EGO among them, print the force there and not on the product page.
- Find a measured reading for your exact model and battery. A reading taken on a sibling model or a different pack does not carry over.
- Estimate it from CFM and mph. The estimate runs high, so treat it as a ceiling, and use measured readings to settle a close call between two blowers.
How the Estimate Works
Force is roughly the mass of air moving each second times its speed, and that mass is air density times airflow, with all three in metric units (3). One CFM is 0.000472 cubic meters per second, one mph is 0.447 meters per second, and air weighs about 1.2 kilograms per cubic meter. Worked through for the EGO LB7654, 765 CFM is 0.361 cubic meters per second and 195 mph is 87.2 meters per second, so 1.2 times 0.361 times 87.2 gives about 38 N, against EGO’s rating of 26 N.
| Blower | Maker’s CFM and mph | Estimate | Maker’s rating | Estimate runs |
|---|---|---|---|---|
| Husqvarna 570BTS | 768 CFM, 236 mph | 46 N | 37 N | 24% high |
| Husqvarna 590BTS | 1,245 CFM, 216 mph | 68 N | 56 N | 22% high |
| Echo DPB-2500 (turbo) | 549 CFM, 158 mph | 22 N | 17 N | 29% high |
| EGO LB7654 (turbo) | 765 CFM, 195 mph with tapered nozzle | 38 N | 26 N | 45% high |
All four estimates land above the maker’s rating. The gap runs from 22 to 45 percent and differs by model, so an estimate cannot sort two blowers that sit close together.
The likely reason is that the CFM and mph on a box are peaks that do not occur at the same instant, and the CFM may be taken without a nozzle while the speed is taken with one. EGO’s manual lists 166 mph without the tapered nozzle and 195 mph with it. I treat the result as a ceiling and use an average speed when the maker gives one.
What Newtons Do Not Tell You
A newton rating does not tell you runtime or noise. It only hints at weight. The EGO example shows the first one: the strongest setting is also the shortest. Noise and weight need their own numbers, and both come next, with the safety steps that go with a strong blower.
Noise and Weight
Noise has its own rating, and a loud one. A field study of lawn equipment, with two leaf blowers and a hose vacuum, measured individual machines at 85 to 101 dB(A) at the center of the test area and found the level at 50 feet in line with the makers’ ratings (5). A study of agricultural backpack machines found noise above 100 dB(A) on every machine except one blower with its exhaust routed inside the hose (6).
Maker noise labels do not share a basis either. Echo lists 80 dB(A) for the PB-9010T with no distance printed on its page, and Husqvarna lists 106 dB(A) at the operator’s ear for the 580BTS, so the two numbers cannot sit side by side. Weight rises with force too: the gas handhelds above weigh 8.6 to 9.6 pounds, and the gas backpacks 22.7 to 26.8 pounds.
Safety With Strong Blowers
Higher force throws gravel and debris harder. Wear eye protection, and keep people, pets and windows out of the debris path. On a gas backpack wear earplugs and earmuffs together from the first minute, add a dust mask for dusty jobs, and stop the engine and let it cool before you refuel.
Shed cleanup shows the limit of force. A strong blower stirs a dust cloud that hangs in the air long after I finish, so I open the doors and wear a dust mask before I start.
Choose by Newtons, Then Check the Pack
Three things decide the purchase. Convert the rating to pounds and match it to your hardest job. Read the setting behind the number, because a battery blower’s top figure can be short: the EGO LB7654’s turbo lasts about 13 minutes on its 5.0 Ah battery. Then check the battery or fuel plan against your total minutes of work, not a single run.
My own habit is to write the setting next to the number, such as 25 N on turbo, before I compare two blowers. When you are ready to compare models, start with our leaf blower guides. The newton rating of a leaf blower is a push at the top setting, so read it in pounds and pair it with the minutes behind it.
Frequently Asked Questions
How do you calculate newton force on a leaf blower?
You can only estimate the newton force of a leaf blower, because the true figure is measured at the nozzle with a force meter. Multiply air density by airflow and speed in metric units; on the models I worked out the result runs 22 to 45 percent above the maker’s rating, so treat it as a ceiling.
Is CFM or MPH better?
Neither CFM nor MPH is better on its own, because the push of the air depends on both. A newton rating combines the two, which is why I compare newtons first and use CFM to judge the size of the pile.
What’s a good MPH for a leaf blower?
A good MPH for a leaf blower depends on the push it adds up to, since speed alone does not rate the push. Read the newton rating, and use mph only to compare blowers with a similar airflow.
Which leaf blower has the most power?
Among the handheld and backpack blowers I checked, the Husqvarna 590BTS has the most power on paper at 56 N, followed by the Echo PB-9010T at 48 N and the Husqvarna 580BTS at 47 N on its current US page. These are maker ratings for the top setting, and the list covers only makers that print the number.
What is blow force on a leaf blower?
Blow force on a leaf blower is the push of the air jet at the nozzle, measured in newtons. A higher figure moves heavier debris such as wet leaves and gravel. The maker’s figure is a maximum for the top setting.
References
- Newell DB, Tiesinga E, eds. The International System of Units (SI). NIST Special Publication 330, 2019 Edition. National Institute of Standards and Technology; 2019.
- Thompson A, Taylor BN. Guide for the Use of the International System of Units (SI). NIST Special Publication 811, 2008 Edition. National Institute of Standards and Technology; 2008.
- NASA Glenn Research Center. Thrust Equation. Beginners Guide to Aeronautics. Updated June 10, 2026.
- Ricou FP, Spalding DB. Measurements of entrainment by axisymmetrical turbulent jets. J. Fluid Mech. 1961;11(1):21-32.
- Walker E, Banks JL. Characteristics of Lawn and Garden Equipment Sound: A Community Pilot Study. J Environ Toxicol Stud. 2017;1(1).
- Calvo A, Preti C, Caria M, Deboli R. Vibration and Noise Transmitted by Agricultural Backpack Powered Machines Critically Examined Using the Current Standards. IJERPH. 2019;16(12):2210.
Safety Note: Leaf blowers throw debris and can damage your hearing. Wear eye and ear protection, read the manufacturer’s manual, and check your local rules on noise and operating hours.