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Percent Dehydration Calculator

Calculate fluid loss percentage to assess clinical dehydration status.

Enter Values

Baseline Weight (kg)

Current Weight (kg)

Result

Enter values above and click Calculate to see your result.

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Our AI assistant provides general estimates and advice only. Please consult a qualified healthcare professional before making any health-related decisions.

Formula

Core Formula

\text{Dehydration \%} = \frac{\text{Normal Weight} - \text{Current Weight}}{\text{Normal Weight}} \times 100

How it works: Determines the level of fluid depletion relative to baseline weight.

Worked Example

Baseline 70kg, Current 67kg -> 4.3% dehydrated.

Assessing Percent Dehydration

Percent dehydration is a critical clinical metric used to determine the severity of fluid loss, especially in cases of illness (vomiting/diarrhea) or extreme heat exposure.

Mild: < 5% loss (thirsty, dry mouth)
Moderate: 5-10% loss (decreased urine, lethargy, sunken eyes)
Severe: > 10% loss (shock, rapid pulse, medical emergency)
Formula: % Dehydration = [(Baseline Weight - Current Weight) / Baseline Weight] × 100

Dehydration over 5% in children or 10% in adults often requires clinical intervention or intravenous fluids. Seek medical help for severe symptoms.

You can also calculate changes using our IV Drip Rate Calculator or Water Intake Calculator.

Frequently Asked Questions

What is a dangerous level of dehydration?

Any loss greater than 10% of body weight is considered severe and potentially life-threatening, requiring immediate medical attention.

Is weight loss from dehydration permanent?

No. This weight loss is purely fluid and will be regained as the body is rehydrated.

Why is this used in pediatrics?

Children have a higher surface-area-to-volume ratio and get dehydrated much faster than adults, making percentage-based tracking vital for their safety.

How can I put this Percent Dehydration Calculator on my blog or website?

Yes, the Percent Dehydration Calculator is fully embeddable. Tap "Embed" above to configure appearance and copy the code. It is free to use, works on any platform (HTML, WordPress, CMS), and adjusts to any screen size automatically. Visit calculory.com/services/embed-calculators for the complete guide.

Medical Disclaimer

This calculator is provided for informational and educational purposes only. It is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making any decisions based on these results. Do not disregard or delay seeking medical advice because of information obtained from this tool.

AI Assistant

Ask about this calculator

I can help you understand the percent dehydration calculator formula, interpret your results, and answer follow-up questions.

Try asking

Our AI assistant provides general estimates and advice only. Please consult a qualified healthcare professional before making any health-related decisions.

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