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Harvest Loss Calculator: Quantify Field Losses and Revenue Impact

Calculate the revenue lost to field harvest losses with color-coded severity ratings and ASABE benchmark comparison. Enter your field yield, measured loss percentage, crop price, and field area to see exactly how much grain is left on the ground and what it costs you. Use the results to justify combine adjustments and reduce harvest waste.

Inputs Explained

Field Yield
Your expected or measured crop yield per hectare or acre before harvest losses. Use your yield monitor average or pre-harvest crop cut estimates.
Harvest Loss %
The percentage of crop left in the field after the combine passes. Measure using a grain loss pan or drop cloth behind the combine.
Crop Price
Current market price per tonne (metric) or per bushel (imperial) in your local currency. Used to convert yield loss into revenue impact.
Field Area
Total field size in hectares or acres. Multiplied by per-area loss to calculate total revenue lost across the entire field.

How This Calculator Works

Based on: Simple loss percentage model with ASABE benchmark severity classification
Best for: Quantifying combine harvest losses in grain crops and calculating the economic cost of field losses
Check locally: Measure actual losses with a grain loss pan at multiple field locations and average the results
Units supported: Metric (t/ha, $/tonne), Imperial (bu/acre, $/bushel)

Worked Example

Wheat field yielding 5 t/ha with 4% measured harvest loss, $300/tonne price, on a 100 ha field

  1. 1. Enter field yield

    5 t/ha expected yield

  2. 2. Enter loss percentage

    4% measured behind the combine

  3. 3. Enter crop price

    $300 per tonne

  4. 4. Calculate lost revenue

    5 t/ha x 4% = 0.20 t/ha lost x $300/t x 100 ha = $6,000 total

$6,000 total lost revenue across 100 ha (0.20 t/ha loss, ASABE rating: Elevated)

How to Interpret Your Results

ConditionWhat It Means
Loss below 3%Acceptable by ASABE standards. Most well-maintained, properly adjusted combines achieve 1-2% total losses.
Loss 3-5%Elevated losses. Common when combine adjustments are needed — check concave clearance, cylinder speed, and forward speed.
Loss above 5%Significant equipment or operator issue. Stop harvesting and investigate header, threshing, and separation settings immediately.

Common Mistakes to Avoid

Including storage losses in harvest loss percentage

This calculator covers field losses only. Storage shrinkage, spoilage, and pest damage are separate and occur post-harvest.

Measuring losses at only one field location

Measure at 5-10 locations across the field and average results. Losses vary with crop density, terrain, and moisture.

Using yield monitor data without calibration

Yield monitors drift over the season. Calibrate with weigh wagon data at the start of each crop for accurate loss calculations.

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Frequently Asked Questions