The Ground Drive Spreader ‘Rate Calculator’ is a powerful tool designed to help operators optimise their spreader settings and ensure accurate application rates. Whether you’re applying granular fertiliser, lime or manure, this calculator takes the guesswork out of machine calibration and helps you achieve consistent and reliable results in the field.
This tool is designed & calibrated for current generation machines. For assistance with calibration for Spreaders built prior to 2018, please Contact Us.
Enter your spreader details below to calculate the recommended door opening.
* Current generation spreaders only - 'T' models
| Material | Average Density (kg/m³) | Density Range (kg/m³) |
|---|---|---|
| Urea | 750 kg/m³ | 690 - 780 kg/m³ |
| Superphosphate | 1200 kg/m³ | 1100 - 1250 kg/m³ |
| Granular SOA | 1000 kg/m³ | 930 - 1070 kg/m³ |
| MAP | 1000 kg/m³ | 930 - 1070 kg/m³ |
| DAP | 1000 kg/m³ | 980 - 1070 kg/m³ |
| NPK Blend | 1000 kg/m³ | 990 - 1100 kg/m³ |
| Lime | 1200 kg/m³ | 1050 - 1250 kg/m³ |
| Gypsum | 1150 kg/m³ | 1050 - 1200 kg/m³ |
| Chicken Manure | 450 kg/m³ | 350 - 480 kg/m³ |
| Screened Manure | 950 kg/m³ | 800 - 1000 kg/m³ |
Getting the right spread pattern is crucial for achieving even material distribution and full field coverage. Proper spinner settings allow you to fine-tune how materials are dispersed, ensuring consistent application across the entire spread width. Our upcoming guides will provide step-by-step instructions on adjusting your spreader for accurate and efficient results. With the right setup, you can reduce waste, avoid overlaps and ensure that materials are applied evenly across your target area.
Validate your result
Finished a test pass in the paddock? Use the Ground Drive Calibration Checker
to confirm your setup.