Herd Health Index Calculator

Work out herd health index instantly with clear inputs, formula shown and shareable results.

About Herd Health Index Calculator

Combines fertility, udder health, lameness and mortality into a transparent 0 to 100 index with stated weights and benchmark anchors, and names the weakest component.

Formula

Herd index

Index = 0.3 x fertility score + 0.3 x udder health score + 0.2 x lameness score + 0.2 x mortality score, each component scaled 0-100 against the stated benchmark

Worked example

With the default values below, Herd Health Index Calculator returns Herd health index of 73.6. Change any input above and every figure here is recalculated in your browser.

Inputs used

Conception rateaccepts 5–90: 45
Bulk milk somatic cell countaccepts 20–1,000 x1000 cells/mL: 250 x1000 cells/mL
Lameness prevalenceaccepts 0–60: 12
Annual mortalityaccepts 0–30: 3

Results

Herd health index: 73.6
Performance band: Moderate performance
Weakest component: udder health
Fertility component score: 81.8

Step by step

1Values used
2Herd index
3Herd health index= 73.6
4Performance band= Moderate performance
5Weakest component= udder health
6Fertility component score= 81.8

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax or fees or charges into account.
Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

Are the weights standard?

No. They are stated explicitly here so the index is transparent; different systems weight components differently.

What benchmarks are used?

Conception rate 55%, bulk milk somatic cell count 150 to 400 thousand, lameness under 5% and annual mortality under 2% are the anchors.