RDW
RDW: calculated with the published clinical method, with result interpretation. A reference tool that does not replace a doctor's advice.
ℹ Reference calculation based on the published method. It does not replace a clinical examination or a doctor's decision.
RDW
Standard deviation of red cell volume (1 SD)fL
MCVfL
RDW-CV
13%
Assessment
Normal (11.5–14.5 %)
More about: RDW
What it calculates
The “RDW” calculator computes RDW-CV in % from 2 parameters: standard deviation of red cell volume (1 sd) (fL), mcv (fL).
Used by professionals and patients to assess health metrics, dosages, and risks.
Example calculation
With parameters Standard deviation of red cell volume (1 SD) = 11.7 fL, MCV = 90 fL the result is 13 % (Do not confuse with the analyzer's RDW-SD: it is measured at 20 % of the histogram height).
How to use
- Enter standard deviation of red cell volume (1 sd) and mcv — each field above is adjustable with a slider.
- RDW-CV (%) is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is BMI calculated?
BMI = weight (kg) / height (m)². Example: 70 kg / (1.75 m)² = 22.9. The WHO normal range is 18.5–24.9; below that is underweight, 25–29.9 is overweight, and 30+ is obese.
Is BMI accurate for everyone?
No. BMI does not distinguish muscle from fat, so athletes may show a high BMI with low body fat. It is also less reliable for teenagers, pregnant people, older adults, and very tall or short individuals.
What are the BMI categories?
Underweight: below 18.5. Normal: 18.5–24.9. Overweight: 25–29.9. Obese class I: 30–34.9; class II: 35–39.9; class III: 40+.
What is a better measure than BMI?
Body fat percentage, waist-to-height ratio (aim for under 0.5), and waist circumference give a clearer picture of health than BMI alone.
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