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Estimated Glucose Variability Calculator

Work out estimated glucose variability instantly with clear inputs, formula shown and shareable results.

About Estimated Glucose Variability Calculator

Expresses glucose standard deviation as a coefficient of variation against the 36% consensus stability target, and converts mean glucose to an estimated HbA1c.

Formula

Variability and eA1c

CV (%) = SD / mean x 100; estimated A1c (%) = (mean glucose mg/dL + 46.7) / 28.7 (Nathan ADAG equation)

Worked example

With the default values below, Estimated Glucose Variability Calculator returns Glucose coefficient of variation of 25.0%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Mean glucoseaccepts 40–500 mg/dL
140 mg/dL
Standard deviation of glucoseaccepts 1–200 mg/dL
35 mg/dL

Results

Glucose coefficient of variation
25.0%
Estimated HbA1c
6.51 %
Stability band
Stable — CV at or below the 36% consensus target

Step by step

  1. 1Values used
  2. 2Variability and eA1c
  3. 3Glucose coefficient of variation= 25.0
  4. 4Estimated HbA1c= 6.51 %
  5. 5Stability band= Stable — CV at or below the 36% consensus target

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 2 decimal places, 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.
  • This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

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

Why 36%?

The international consensus on continuous glucose monitoring uses a CV of 36% to separate stable from unstable glucose profiles.

Is estimated A1c the same as a lab HbA1c?

No. It is a regression estimate from mean glucose and can differ from a measured HbA1c by several tenths of a percent.

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