Parking Lot Plow Time Estimator: Acres Per Hour and Route Hours Per Storm
Estimate how long a parking lot or plow route takes per storm from area, snow depth, blade width, speed, passes and overlap, plus drive time and reload stops.
How this is calculated
The estimate follows the productivity formula BOSS Snowplow publishes: the ground one pass clears, times your speed, gives acres per hour; an efficiency factor discounts that for turns, obstacles, stacking and delays; the area divided by the result is the plowing time. Drive time between stops and reload stops are added on top, because they happen outside the lot.
swept width = blade width × cos(blade angle)
effective width = swept width − overlap
theoretical ac/h = (effective width ft × mph × 5,280) ÷ 43,560
real ac/h = theoretical × efficiency factor
plowing hours = area × passes per lane ÷ real ac/h
drive hours = legs × minutes per leg ÷ 60
(legs = stops, plus 1 if you add the drive back)
reload hours = reload stops × minutes per stop ÷ 60
total per event = plowing + drive + reloads
pass-by-pass check (one lot, width known):
passes = ceil(lot width ÷ effective width) × passes per lane
lot length = area ÷ lot width
straight runs = passes × lot length ÷ (mph × 5,280)
turns = (passes − 1) × seconds per turn
implied factor = (area × passes per lane ÷ theoretical ac/h) ÷ check totalWorked example (the defaults). BOSS's own figures: "A 7-foot effective width at 10 mph yields a theoretical rate of about 8.5 acres per hour. With a 0.7 efficiency factor, your realistic productivity drops to approximately 6 acres per hour." Unrounded that is 8.48 and 5.94 acres per hour, so BOSS's 2-acre example lot takes about 20 minutes of plowing. On a 200 ft wide lot a 7 ft pass needs 29 passes, the count BOSS gives for a 200 ft lot.
The constants and where each comes from.
Figure Source
5,280 ft per mile; 43,560 sq ft per acre BOSS formula
Speed by depth: 1-2 in 10-14 mph, BOSS depth table
2-4 in 8-12, 4-6 in 5-10,
6-10 in 3-7, over 10 in 1-5
Efficiency 60% to 80%, 70% default BOSS step 7 and calculator
15 to 30 s per turn BOSS step 5
5 to 15 min stacking per lot BOSS step 5
Multiple passes past about 8 in BOSS calculator notes
1 to 2 ac/h per truck, mixed lots BOSS FAQ
1 to 3 real ac/h, most setups BOSS calculator notes
1 mph = 1.609344 km/h; 1 ft = 0.3048 m NIST SP 811, Appendix B.9Two places the source disagrees with itself, shown side by side. BOSS's step 3 gives 8 to 14 mph for "light snow (2 inches or less)", while its depth table gives 10 to 14 mph for 1 to 2 inches. The speed field pre-fills the low end of the table band; drop it to 8 if you follow step 3. And BOSS's formula example lands near 6 acres per hour, while its own FAQ says "Commercial contractors typically target 1-2 acres per hour per truck for mixed complexity lots." The formula is only as good as the efficiency factor in it, so the page warns when the result runs above 3 acres per hour. Your own timed lots are the authority: when you have them, set the efficiency factor from them.
Why the pass-by-pass check is not added to the total. BOSS's efficiency factor already accounts for "turning, obstacles, travel time, snow stacking, and operator delays", and its 20 to 25% buffer covers the same turns and stacking. Adding itemized turns and stacking on top would count them twice. The check times the lot the long way instead and reports the efficiency those turn and stacking inputs imply, so you can see whether 70% is generous for this lot.
What is not pre-filled. Drive minutes, reload counts and reload minutes start at zero because no published figure fits every route. The route stop count is an example.
Hours are the input every other winter number depends on. Put them into the snow removal pricing calculator as hours per push, cost the truck and blade with the equipment cost per hour calculator, and sequence the stops with the route day planner.
How long does it take to plow a parking lot?
Divide the plowable area by your real plowing rate. BOSS Snowplow’s formula: effective pass width in feet times mph times 5,280, divided by 43,560, then discounted by a 60 to 80% efficiency factor. A 7 ft pass at 10 mph is about 8.5 acres per hour in theory and about 6 at 70%. BOSS’s own FAQ puts mixed commercial lots at 1 to 2 acres per hour per truck, so time a lot before trusting either figure.
That gap is the whole reason this estimator exists. The formula is a ceiling set by the blade and the speed. The benchmark is what a truck actually does on a lot with islands, light poles, parked cars and nowhere obvious to put the snow. The efficiency factor is the dial between them, and it is the number most worth getting right before you sign a route.
Acres per hour by pass width and speed
The theoretical rate is width times speed. Each foot of effective pass width at 1 mph sweeps 5,280 square feet an hour, which is 0.1212 of an acre. The table is that arithmetic on BOSS’s formula at a 70% efficiency factor:
| Effective pass width | 3 mph | 5 mph | 8 mph | 10 mph |
|---|---|---|---|---|
| 7 ft | 1.78 ac/hr | 2.97 ac/hr | 4.75 ac/hr | 5.94 ac/hr |
| 8.5 ft | 2.16 ac/hr | 3.61 ac/hr | 5.77 ac/hr | 7.21 ac/hr |
| 10 ft | 2.55 ac/hr | 4.24 ac/hr | 6.79 ac/hr | 8.48 ac/hr |
Only the slow column lands inside the 1 to 3 real acres per hour that BOSS says most straight and V-plow setups reach after efficiency losses. That is not because the formula is wrong. It is because 70% is generous for a busy lot, and because the speed that fits 2 inches of powder does not fit 8 inches of wet snow.
Effective width is also smaller than most people enter. BOSS’s example is a 98 in V-plow that clears about 85 in at a 30 degree angle, which is the blade width times the cosine of the angle. Any overlap you leave between passes comes off that again, and past roughly 8 inches BOSS notes most operators plan for more than one pass per lane, which doubles the ground the truck covers.
Speed by snow depth
BOSS’s depth table is the starting point the speed field uses:
| Snow depth | Typical speed |
|---|---|
| 1 to 2 in | 10 to 14 mph |
| 2 to 4 in | 8 to 12 mph |
| 4 to 6 in | 5 to 10 mph |
| 6 to 10 in | 3 to 7 mph |
| Over 10 in | 1 to 5 mph |
The same article’s step 3 gives 8 to 14 mph for “light snow (2 inches or less)”, so the two disagree at the light end. The calculator pre-fills the low end of the table band and tells you the step 3 figure; drop the speed to 8 mph if you follow step 3. BOSS also says lots with islands, light poles and curbs need slower speeds than open lots, so a tight retail lot belongs at the bottom of its band.
Checking the efficiency factor pass by pass
If you know the lot width, the estimator times the same lot a second way: every pass at full speed down the length of the lot, a turn between passes, and stacking at the edges. BOSS puts turns at 15 to 30 seconds each and stacking at 5 to 15 minutes per lot. With the top of both ranges, the default 2-acre lot (200 ft wide, 29 passes) takes about 43 minutes against 14 minutes at the theoretical rate, which implies an efficiency factor of about 33%. That is roughly 2.8 acres per hour, inside the 1 to 3 real acres per hour BOSS’s calculator notes give, from nothing but BOSS’s own figures.
The check is never added to the total. BOSS’s efficiency factor already covers “turning, obstacles, travel time, snow stacking, and operator delays”, so itemizing turns and stacking on top of it would count them twice. Use the check to decide what factor to type, not as a second line of time.
From one lot to route hours per storm
A route is the lots plus everything between them. BOSS lists excluding travel between sites and ignoring salt reload time among the common mistakes, so the estimator adds both outside the efficiency factor: drive legs (yard to the first lot, then lot to lot, plus the drive back if you count it) and reload or loading stops. For reload counts, BOSS’s rule of thumb is that at 300 to 500 lb of salt per acre a 2 cubic yard spreader covers roughly 8 to 12 acres before a refill. Size the salt itself with the de-icing salt calculator.
The route total is the number the rest of the winter is built on. Put the hours per lot into the snow removal pricing calculator as hours per push instead of guessing them, cost the truck and blade with the equipment cost per hour calculator, and lay the stops out by day with the route day planner. If the total runs past the hours a crew can work through one storm, that is a contract question as much as a scheduling one, and structuring a winter service line covers trigger depths and per-push versus seasonal terms. Every other snow and landscape calculator sits on the lawn and landscape hub.
What this estimator does not know
It has no map, no weather feed and no record of your lots. Drive minutes and reload minutes start at zero because no published figure fits every route, and the route stop count is an example. The speeds, the efficiency range, the turn and stacking times and the benchmark all come from one equipment maker’s guide, cited below; they are starting points to replace with your own timings, not a standard. Your own clock on a real storm is the authority.
Frequently asked questions
How many acres per hour can a snow plow clear?
How do you work out how many passes a parking lot needs?
What efficiency factor should I use for snow plowing?
How fast should you plow a parking lot?
Sources
- How to Calculate Snowplow Productivity Per Hour in 7 Steps (2026), published 07/29/2026, updated 09/29/2026: "Productivity (acres/hour) = [[Effective pass width (ft) × Speed (mph) × 5,280] ÷ 43,560] x Efficiency Factor"; "A 7-foot effective width at 10 mph yields a theoretical rate of about 8.5 acres per hour. With a 0.7 efficiency factor, your realistic productivity drops to approximately 6 acres per hour"; "Start with an efficiency factor between 60% to 80%"; "70% is a reasonable default for an experienced operator on a moderately busy lot"; speed by depth 1-2" 10-14 mph, 2-4" 8-12 mph, 4-6" 5-10 mph, 6-10" 3-7 mph, 10"+ 1-5 mph; "This typically adds 15-30 seconds per turn"; stacking "can take 5-15 minutes per lot"; "Commercial contractors typically target 1-2 acres per hour per truck for mixed complexity lots"; calculator notes: "land between 1 and 3 real acres per hour"; "Past roughly 8" of accumulation, most operators plan for multiple passes per lane". BOSS Snowplow. Retrieved .
- NIST Guide to the SI, Appendix B.9: "mile per hour (mi/h) kilometer per hour (km/h) 1.609 344 E+00" and "foot (ft) meter (m) 3.048 E-01", both exact. National Institute of Standards and Technology. Retrieved .