Anaemia Prevalence Calculator

Work out anaemia prevalence instantly with clear inputs, formula shown and shareable results.

About Anaemia Prevalence Calculator

Divides people with anaemia by those tested and applies the WHO categories of public health significance.

Formula

Anaemia prevalence

Prevalence (%) = anaemic people / people tested x 100. WHO categories: under 5% not a problem, 5-19.9% mild, 20-39.9% moderate, 40% or more severe

Worked example

With the default values below, Anaemia Prevalence Calculator returns Anaemia prevalence of 28.000%. Change any input above and every figure here is recalculated in your browser.

Inputs used

People with anaemiaaccepts 0–1,000,000: 280
People testedaccepts 1–10,000,000: 1,000

Results

Anaemia prevalence: 28.000%
WHO public health significance: Moderate public health problem
People without anaemia: 720
Anaemic people per 1,000 tested: 280.0

Step by step

1Values used
2Anaemia prevalence
3Anaemia prevalence= 28.000
4WHO public health significance= Moderate public health problem
5People without anaemia= 720
6Anaemic people per 1,000 tested= 280.0

Assumptions and limits

The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

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

Frequently Asked Questions

Which haemoglobin thresholds define anaemia?

13 g/dL in adult men, 12 in non-pregnant women, 11 in pregnant women, adjusted for altitude and smoking.

Is iron always the cause?

No. Thalassaemia, malaria, hookworm, vitamin deficiencies and chronic inflammation all contribute in many settings.