⚙️ Grain Auger Horsepower Calculator
Calculate the exact horsepower required for your grain auger based on grain type, auger size, length, and throughput rate
| Diameter | 20 ft | 30 ft | 40 ft | 50 ft | 60 ft | 70 ft |
|---|---|---|---|---|---|---|
| 4 inch | 1.0 HP | 1.5 HP | 2.0 HP | 2.5 HP | 3.0 HP | 3.5 HP |
| 6 inch | 1.5 HP | 2.5 HP | 3.5 HP | 4.5 HP | 5.5 HP | 6.5 HP |
| 8 inch | 3.0 HP | 4.5 HP | 6.0 HP | 7.5 HP | 9.0 HP | 11.0 HP |
| 10 inch | 5.0 HP | 7.0 HP | 9.5 HP | 12.0 HP | 15.0 HP | 18.0 HP |
| 12 inch | 7.5 HP | 10.0 HP | 14.0 HP | 18.0 HP | 22.0 HP | 27.0 HP |
Values are approximate at 30° incline, dry grain (corn), 85% drive efficiency with 20% safety buffer.
| Throughput (bu/hr) | Throughput (t/hr) | Calculated HP | Recommended HP | Motor Size |
|---|---|---|---|---|
| 500 | 0.64 | 1.8 HP | 2.5 HP | 2.5 HP Electric |
| 1,000 | 1.27 | 3.2 HP | 4.0 HP | 5 HP Electric |
| 2,000 | 2.54 | 5.8 HP | 7.0 HP | 7.5 HP Electric |
| 3,000 | 3.81 | 8.2 HP | 10.0 HP | 10 HP Electric |
| 4,500 | 5.72 | 11.5 HP | 14.0 HP | 15 HP Electric |
| 6,000 | 7.62 | 14.8 HP | 18.0 HP | 20 HP Electric |
| 8,000 | 10.16 | 19.2 HP | 23.0 HP | 25 HP Electric |
| Incline Angle | HP Multiplier | Typical Use | Notes |
|---|---|---|---|
| 15° | 0.80x | Flat bin loading | Lower HP demand |
| 20° | 0.88x | Low-profile bins | Good efficiency |
| 30° | 1.00x | Standard farm auger | Baseline reference |
| 35° | 1.10x | Tall bins | +10% HP needed |
| 40° | 1.20x | Grain legs / elevators | +20% HP needed |
| 45° | 1.32x | Maximum practical | +32% HP, reduced flow |
| Motor HP | kW Equivalent | Typical 8" Auger Length | Approx. Throughput (corn) |
|---|---|---|---|
| 2 HP | 1.5 kW | Up to 20 ft | ~500 bu/hr |
| 3 HP | 2.2 kW | Up to 25 ft | ~800 bu/hr |
| 5 HP | 3.7 kW | Up to 30 ft | ~1,200 bu/hr |
| 7.5 HP | 5.6 kW | Up to 40 ft | ~2,000 bu/hr |
| 10 HP | 7.5 kW | Up to 50 ft | ~3,000 bu/hr |
| 15 HP | 11.2 kW | Up to 60 ft | ~4,500 bu/hr |
| 20 HP | 14.9 kW | Up to 70 ft | ~6,000 bu/hr |
| 25 HP | 18.6 kW | Up to 80 ft | ~8,000 bu/hr |
Grain auger horsepower is key for anyone who moves grain on farms Right amount of power makes whether operation flows smooth or becomes a mess. Electric motor, tractor by PTO or internal combustion engine on the auger can move it. The helical flighting twists inside long metal tubes, pushing grain upward, when a hopper receives it from truck or grain cart.
For maximum capacity horsepower ranges from 40 to 175 depending on size of auger. Operators move big amounts of grain using 10-inch, 13-inch or 16-inch tubes up to 114 feet long, in short times. V-belt drives with fractional horsepower commonly serve for small augers.
Choosing the Right Horsepower for a Grain Auger
Size of auger and kind of grain genuienly matter. They handle corn and soy differently, so hourly capacity varies a lot. Augers work well with dry corn, so for wet crops increase diameter from 8 to 10 inches.
More and more farmers choose 13- or 16-inch for bigger volume. Wet grains require even more power.
10-inch 72-foot auger requires at least around 72 HP. 13-inch 70-foot grain auger works for tractors with 80 PTO horsepower, ideal for mid-sized farms. 10-inch 51-foot with 40 HP engine is minimum, that runs full load for certain grains.
Strong grain requires only a bit more energy.
Westfield 13-inch 71-foot puts around 90 HP load on tractor to fill high hopper with 18 percent corn. But emptying 15 percent corn from hopper for truck below requires lot less power. Capacity and horsepower vary according to grain type and condition, auger RPM, exposed flighting and pitch.
Small 6-inch 21-foot augers with 1.5 HP engine work in 120 volt, but stop if overloaded. 2 HP or more require 220 or 240 volt. For custom augers power needs depend on material kind and state, loading factor and RPM.
Choosing the rightmotor according to diameter, length and grain type is key.
