This vitamin a calculator takes the figures you already have and applies the relationship behind vitamin a calculations for you, giving retinol activity equivalents and rae total from international units, international units, international units and international units.
What Is the Vitamin a Calculator?
The vitamin a calculator gives you an estimate of retinol activity equivalents and rae total based on international units, international units, international units and international units.
It is a quick reference figure rather than a diagnosis, and it is most useful for tracking how a number moves over time rather than for interpreting a single reading.
How the Vitamin a Estimate Is Worked Out
The calculation follows published reference relationships, so it is a reasonable approximation when the inputs are accurate. It assumes an average adult and does not account for individual variation.
If you are comparing two people, or the same person over a period of weeks, keep the method and the inputs identical. A change in the method can easily look like a change in the person.
What This Calculator Does Not Do
It does not diagnose anything, and it does not replace advice from a clinician. If a figure comes out at an extreme, or if it differs sharply from what you expect, that is a reason to speak to a professional rather than to adjust the inputs.
Nothing you type here is stored or sent anywhere. The whole calculation happens in your browser.
A Worked Example
Working through an example, with international units set to 10, international units set to 5, international units set to 2, the calculator returns retinol activity equivalents of 30, and retinol activity equivalents (rae carotene suppl) of 1.5, and retinol activity equivalents (rae carotene) of 0.5. Substitute your own figures and the same steps produce the same kind of answer.
Frequently Asked Questions
What do I need to work out retinol activity equivalents?
Enter international units, international units, international units and international units. The calculator then works through the relationship and reports retinol activity equivalents and rae total.
What does the vitamin a actually calculate?
It takes international units, international units, international units and international units and converts them into retinol activity equivalents and rae total using the standard relationship for this problem. Each step is applied in turn, so every output is traceable back to the numbers you typed in.
How should I enter international units?
Use the value you actually have, in the unit shown next to the field. Enter every value in the same unit system. The calculator assumes the figures you supply are consistent, so it cannot correct a mistake that happens before the calculation starts.
Why does a small change in one value move the answer so much?
That happens when an output depends on a ratio, because dividing by a small number magnifies any change in it. Check the units first, then check whether the value you entered is in the range the relationship was designed for.
Does anything you type get stored?
No. The whole calculation runs inside your browser, and nothing you enter is uploaded, logged or sent anywhere.