Grain Storage Capacity Calculator
Estimate how much grain a bin of your dimensions can hold — free, instant, no sign-up.
Free to use — no sign-up required
Results
Results are indicative — confirm with our engineers for project-critical sizing.
How to Use This Tool
- Enter bin dimensions — diameter and eave height in metres. These are the inside dimensions of the bin at the grain line.
- Pick roof & hopper type — flat or conical roof, flat or hopper bottom. Hopper angle only applies to hopper-bottom bins.
- Choose your crop — test weight auto-fills from our database; override it if your local test weight differs.
- Adjust compaction — 5% is typical for flat-bottom bins; 0% for first-fill estimates.
- Read the results — total volume, grain capacity in tonnes, usable capacity after compaction, and equivalent truckloads (25 t per truck).
How It Works
The capacity of a grain bin is the sum of three geometric volumes, converted from volume to grain mass using the crop's test weight:
- Cylinder volume
π × (D/2)² × Heave - Conical roof volume
(1/3) × π × (D/2)² × (D/2 × tan(θroof)) - Hopper volume (if hopper-bottom)
(1/3) × π × (D/2)² × (D/2 × tan(θhopper))
Grain capacity (tonnes) = Total volume (m³) × Test weight (kg/hL) × 10 ÷ 1000, then multiplied by (1 − compaction%) for usable capacity. Test weight in kg/hL is converted to kg/m³ by multiplying by 10 (1 hL = 0.1 m³).
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Read Article →Ready to apply these calculations to your project?
Our grain storage engineers will tailor a silo, drying or handling solution to your exact site and crop — from farm bin to terminal. Free consultation within 24 hours.