Do yield measurements need the same moisture basis?

Yes. Compare quantities expressed at the same moisture, grade, and unit basis. Otherwise water, quality, calibration, or conversion differences can be mistaken for physical harvest loss.

Is lost crop value the same as lost profit?

No. The calculator multiplies lost quantity by the entered price to show gross crop value. It does not subtract extra harvesting, drying, handling, transport, storage, or marketing costs.

Can this calculator be used for vegetables and hand-harvested crops?

Yes. Use pounds, kilograms, boxes, or generic units consistently. Representative field samples can be scaled to a per-acre or per-hectare loss before entry.

Crop Harvest Loss Calculator

Q: How is crop harvest loss percentage calculated?

Harvest loss percentage equals lost yield divided by harvestable yield, multiplied by 100. Harvestable yield is either measured before harvest or estimated as harvested yield plus measured net field loss.

Q: What is the difference between harvest loss and recovery rate?

Harvest loss is the share of harvestable crop not collected. Recovery rate is the share collected. When both use the same yield and moisture basis, the two percentages add to 100 percent.

Q: Should pre-harvest loss be included?

It depends on the question. Include all loss when evaluating total field recovery. To estimate machine-attributable loss, measure loss before harvest and subtract that baseline from the total measured behind the machine before entering net field loss.

Q: Are my crop data stored?

No. The calculation runs in the browser, and the values entered into the tool are not sent or stored.

Calculate the share of a harvestable crop left in the field, its gross value, and the yield that could be recovered by reaching a target loss rate.

Compare before-and-after yields or start with measured net field loss. Calculations run locally; crop, acreage, yield, and price inputs are not sent or stored.

Harvest Inputs

Calculation method

Production basis

Changing the basis relabels entries; it does not convert existing values.

Use two estimates on the same moisture, grade, and unit basis. Harvest loss is harvestable yield minus harvested yield.

Field and Yield

Field size (acres)

Harvestable yield before harvest (bu/acre)

A representative yield estimate immediately before harvest.

Actual harvested yield (bu/acre)

Saleable or stored yield on the same basis as the estimate above.

Value and Target

Currency

Crop price ($/bu)

Used for gross crop value, not profit.

Target harvest loss (%)

Use a realistic local target based on crop, conditions, and equipment.

Harvest Loss Results

Enter a harvest scenario to calculate crop loss and recovery.

Harvest loss rate—

Recovery rate—

Loss per acre—

Total crop lost—

Gross value lost—

Harvestable yield—

Total crop harvested—

Recoverable crop at target—

Gross recoverable value—

Measure	Current	At target
Calculate to compare current and target loss.

Gross value does not account for the additional cost or feasibility of recovering more crop.

How to Measure Harvest Loss

1. Compare like with like

Use the same crop quantity, area, moisture, and grade basis for every yield figure. Normalize grain measurements before comparing them.

2. Sample representative areas

Use several locations that represent field variation. Scale counted or weighed crop in the sampled area to a per-acre or per-hectare estimate.

3. Separate the source when needed

To estimate machine loss, measure the pre-harvest baseline and subtract it from total crop found after the machine passes.

Formulas and Assumptions

Comparison method: loss per area = harvestable yield − harvested yield

Measured-loss method: harvestable yield = harvested yield + net measured field loss

Harvest loss (%) = loss per area ÷ harvestable yield × 100

Recovery rate (%) = harvested yield ÷ harvestable yield × 100

Total crop lost = loss per area × field area

Gross value lost = total crop lost × crop price

Recoverable crop at target = max(0, current loss − harvestable yield × target rate) × field area

The calculator assumes the loss rate is representative across the entered field and that price is constant for all potentially recovered crop. It does not infer where loss occurred or whether remaining crop is marketable. Differences between estimated and harvested yield may also reflect sampling error, yield-monitor calibration, moisture, grade, spoilage, handling, or unit conversion—not physical harvest loss alone.

Worked Example

A 160-acre field has an estimated harvestable yield of 180 bushels per acre and records 174 bushels per acre harvested. The difference is 6 bushels per acre, or a 3.33% harvest loss and a 96.67% recovery rate.

The field-total loss is 960 bushels. At $4.75 per bushel, that is $4,560 of gross crop value. Reaching a 1.5% target would reduce loss to 2.7 bushels per acre and recover 528 bushels, with a gross value of $2,508 before any extra harvest, handling, drying, storage, or marketing cost.

Measurement References

University of Georgia Cooperative Extension: Measuring Field Losses from Grain Combines — representative sampling, crop-specific count conversions, and separating pre-harvest from machine loss.
NC State Extension: Estimating and Reducing Field Losses — scaling weighed crop from representative row samples to pounds per acre and field totals.
University of Florida IFAS Extension: Adjusting Crop Yield to a Standard Moisture Content — why yields should be normalized to a common moisture basis before comparison.

These references support the measurement and comparison approach, not the default values or a universal acceptable-loss threshold. Sampling conversions and reasonable targets vary by crop, seed size, harvest method, equipment, field conditions, moisture, and market specification.

FAQs

How is crop harvest loss percentage calculated?

Divide lost yield by harvestable yield and multiply by 100. With measured field loss, harvestable yield equals harvested yield plus the net measured loss.

What is the difference between harvest loss and recovery rate?

Harvest loss is the share not collected; recovery rate is the share collected. On a consistent basis, they add to 100%.

Should pre-harvest loss be included?

Include it when evaluating total field recovery. To isolate machine-attributable loss, measure the pre-harvest baseline and subtract it from total loss measured after the machine passes, then enter that net value.

Do the yield measurements need the same moisture basis?

Yes. Normalize quantities to the same moisture, grade, and unit basis. Otherwise the calculated difference can include water, quality, calibration, or conversion effects.

Is gross value lost the same as lost profit?

No. It is lost quantity multiplied by entered price. Profit would also account for added harvest, labor, fuel, drying, handling, transport, storage, and marketing costs.

Can I use this for vegetables or hand-harvested crops?

Yes. Select pounds, kilograms, boxes, or generic units and keep the measurements consistent. Scale representative samples to a per-acre or per-hectare value before entry.

Are my crop data stored?

No. The calculation runs entirely in your browser, and this tool does not send or store the values entered.

Planning Limits

This calculator is an arithmetic field-planning aid, not agronomic, machinery, marketing, insurance, or financial advice. Do not change machine settings solely from this result. Follow the equipment operator’s manual, sample multiple representative areas, use crop-specific conversion guidance, and confirm whether additional recovered crop would meet buyer requirements and justify its costs.