Free tool · Air-Weight
Estimate your grain truck’s weight — no scale needed
Enter the bag pressures you're already reading. Air-Weight turns them into an estimate you can save as a load — no scale, no second trip.
Air-Weight is an estimate for planning. It is not a certified scale measurement, not legal weight, and not elevator settlement.
Air WeightEstimate on this page
Net bushels
Enter every bag pressure to estimate. Clearing a bag clears the number.
Bag pressures · tap a bag to enter
Display unit — does not enter bushels
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How it works
Three steps between you and a number you can plan on.
Enter your bag pressures
Punch in the readings you're already taking — front, rear, and trailer axles. No sign-up, no paperwork.
See the estimate
Air-Weight does the pressure-to-weight math and shows the load in pounds, bushels, and tonnes.
Keep it on your farm
Save the estimate as a load, filed to the bin and field you choose. Everything you entered carries over when you sign up.
Why air pressure tells you the weight
Your suspension is already weighing the truck — it just doesn’t show you the number. Air bags hold the load up at a pressure that tracks the weight on the axles: more grain, more pressure. Read the gauges you’re already glancing at and the math turns those readings into a weight estimate.
It’s the same principle as the onboard load gauges on newer trucks, minus the hardware. An estimate, not a certified scale — plenty for planning the load.
What you get: pounds, bushels, and tonnes
Every estimate comes back in pounds and tonnes — and in bushels once you've told it the crop. Each one answers a different question: pounds for the truck, bushels for the bin, tonnes for the ticket. One reading, numbers you can actually use.
When an estimate is enough — and when you need a certified scale
An estimate is enough when the question is “roughly how much am I hauling?” — loading the truck, deciding whether it’s one trip or two, keeping your own bin records straight. That covers most days at harvest.
You need a certified scale when money changes hands on the weight: elevator settlement, legal highway weight, anything contractual. Air-Weight plans the load; the scale settles it. Knowing which job is which is the whole point.
Common trailer capacities
Quick reference for sizing a load. Figures are typical for wheat at 60 lb/bu — your trailer, your grain, and how it’s heaped all move the real number.
| Trailer | Typical bushels |
|---|---|
| Super B (5-axle hopper) | ~2,100–2,200 |
| Tridem | ~1,050–1,150 |
| Tandem | ~850–950 |
Level-full, wheat basis. Barley and oats run lighter per bushel, so the same trailer holds more bushels of light grain. When in doubt, weigh it.
Common questions
Straight answers on what an air-pressure estimate can and can't do.
How accurate is an air-pressure weight estimate?
Good enough for loading decisions. It tells you roughly what you're sitting on so you can right-size the load, skip the extra trip, and not get surprised at the elevator. It is an estimate — it won't replace a certified scale.
Can I use this instead of a certified scale when I sell grain?
No. The elevator settles on certified scale weight, and this doesn't change that. Air-Weight is for planning the load before you leave the yard, not for the ticket.
What should my air bags read when the truck is loaded?
Depends on the suspension and the truck — there's no universal number. The honest way is to note your own empty and loaded readings once; from there the estimate tracks with what your rig actually does.
How many bushels does a Super B hold?
Roughly 2,100–2,200 bushels level-full on a typical 5-axle Super B, and heaped adds more. It varies by trailer — check the capacity table below against your own rig.
Will this tell me if I'm overweight for the highway?
It gives you the weight estimate — you compare it against your registered GVW and axle limits. It won't certify legal weight, but it beats guessing in the yard.
Does it work on spring-ride trailers?
No. The pressure method needs air suspension — there's nothing to read on a spring-ride trailer. If your trailer rides on springs, a scale is the only honest answer.
Free to try
Know what you're sitting on.
Sign up and your estimate carries over — save it as a load on your farm, tied to the bin and field, instead of retyping every bag pressure.
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