# Calf Dehydration & Fluid Deficit Calculator (Calf Scours)

> Free calf scours dehydration calculator: estimate % dehydration from eyes, skin tent and attitude, and the fluid deficit in litres for a diarrhoeic calf.

- Source page: https://wevet.in/calculators/calf-dehydration-calculator/
- Type: Calculator
- Publisher: WeVet
- Updated: 2026-11-01
- Audience: veterinarians and veterinary students

Estimate how dehydrated a scouring calf is from its signs — sunken eyes, skin tent, depression, recumbency — and the fluid deficit in litres to replace.

Use the free interactive calculator: https://wevet.in/calculators/calf-dehydration-calculator/

## Inputs

- Body weight
- What you see: Few clinical signs (< 5%) · Sunken eyes, skin tent 3–5 seconds (6–7%) · Depressed, skin tent 8–10 seconds, dry mucous membranes (8–10%) · Recumbent, cool extremities, poor pulse (11–12%)

## How it is calculated

| Clinical signs | Dehydration |
|---|---|
| Few clinical signs | < 5% |
| Sunken eyes, skin tenting for 3–5 seconds | 6–7% |
| Depression, skin tenting for 8–10 seconds, dry mucous membranes | 8–10% |
| Recumbent, cool extremities, poor pulse | 11–12% |
| Death | > 12% |

[1]

**Fluid deficit (L)** = body weight (kg) × % dehydration [1].

Severely dehydrated calves have lost the suckle reflex and do not stand on their own [1].

## Worked example

45 kg calf, depressed with an 8–10 second skin tent: 45 × 8–10% = 3.6–4.5 L deficit.

## Frequently asked questions

### How do you tell how dehydrated a calf is?

Sunken eyes with a skin tent of 3–5 seconds indicate about 6–7% dehydration; depression, a skin tent of 8–10 seconds and dry mucous membranes 8–10%; recumbency, cool extremities and a poor pulse 11–12% [1].

### How much fluid does a dehydrated calf need?

The fluid deficit in litres is body weight in kg × % dehydration — for example a 45 kg calf that is 8% dehydrated needs 3.6 L to correct the deficit [1].

## References

[1] Diarrhea in Dairy Calves: Role of Supportive Therapy (Table 1: Assessing dehydration) — D.M. Amaral-Phillips — University of Kentucky, Animal & Food Sciences. https://afs.ca.uky.edu/sites/afs.ca.uky.edu/files/diarrhea_in_dairy_calves%20role%20of%20supportive%20therapy%202024.pdf

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Numbers in [brackets] cite the references above. For veterinary professionals. Information supports — never replaces — clinical judgement; always check the current product label and local regulations.
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