Agriculture & Forestry
Combine Harvester Header Rotor Loss & Sieve Chaffer Loss Sizer
Calculate combine harvester header rotor loss & sieve chaffer loss using the stated engineering or scientific relationship and adjustable field inputs.
Preparing your result…
What this calculator does
Calculates Combine Harvester Header Rotor Loss & Sieve Chaffer Loss Sizer using the formula verified against the cited source.
What your result means
An estimate from the inputs you enter, within the scope stated below — not advice.
Formula
Loss (bu/acre) = seeds per ft² ÷ c, where c = crop (corn ≈ 2) seeds per ft² that equal 1 bu/acre. Machine loss = (behind-machine count − pre-harvest count) ÷ c
The step-by-step working for your own numbers appears with the result above and in the PDF report.
Frequently asked questions
Symbols and assumptions
- Inputs
- The values entered in the fields above
- • Estimated harvest loss bu/acre=representative kernels per ft²/(crop-specific kernels per ft² equivalent to1bu/acre). Example corn approximation:2kernels/ft²≈1bu/acre.
Sources and review
Reviewed 2026-10-18 · Next review 2027-04-18
- • Crop and seed size determine the factor. A single ground count cannot separate header, rotor and sieve/chaffer losses. Need preharvest, post-header and separator sampling zones and the represented area, or narrow the title to estimated total ground-kernel loss.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
Quick reference
| Scenario | Average seeds per ft² behind the machine (all loss) (seeds/ft²) | Average seeds per ft² in standing crop ahead (pre-harvest loss) (seeds/ft²) | Seeds per ft² equal to 1 bu/acre (depends on seed size) (seeds/ft² per bu/acre) | Machine (harvest) loss |
|---|---|---|---|---|
| Worked example | 6 | 1 | 2 | 2.5 bu/acre |
| Half the amounts | 3 | 0.5 | 1 | 2.5 bu/acre |
| Double the amounts | 12 | 2 | 4 | 2.5 bu/acre |
Need the full picture? Get the detailed PDF report with charts, tables, formulas and working steps.
Reviewed 2026-10-18 · Next review 2027-04-18
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