Editorial methodology

How CaloNote Calculators Work

The formulas, source hierarchy, worked examples, rounding rules and limitations behind CaloNote's nutrition and training calculators.

Last reviewed: August 7, 2026

A calculator is an estimate, not a measurement

CaloNote calculators turn a small set of inputs into a useful starting point. They do not measure metabolism, body fat, fitness or medical risk directly. A laboratory test, a clinician's assessment or a carefully observed trend can disagree with a formula and be more informative for an individual.

We separate the arithmetic from the interpretation. The result card gives the estimate; the written guide names the formula, explains its assumptions and identifies where it becomes less reliable. We do not add decimal places that the source equation cannot support.

Our source hierarchy

  1. 1. Original research for named equations

    When a calculator uses a published model, we prefer the original paper. Resting energy expenditure, for example, uses the Mifflin–St Jeor equation derived from 498 adults aged 19–78. The source is the 1990 American Journal of Clinical Nutrition paper, not another calculator that repeats it.

  2. 2. Public-health guidance for interpretation

    A formula and its meaning are different questions. BMI arithmetic is fixed, but the result is only a screening measure. The CDC's BMI guidance notes that BMI cannot distinguish fat from muscle and bone, so we never present a BMI result as a body-fat diagnosis.

  3. 3. Maintained datasets for reference values

    Food values are checked against USDA FoodData Central. Exercise energy estimates use MET values associated with the Compendium of Physical Activities. We distinguish a generic reference food from a branded product because preparation, water content and formulation can change the label.

Worked example: from BMR to a calorie target

Consider a 35-year-old man who is 175 cm tall and weighs 80 kg. The Mifflin–St Jeor equation estimates resting energy expenditure as:

10 × 80 + 6.25 × 175 − 5 × 35 + 5 = 1,724 kcal/day

That is a resting estimate, not a maintenance target. Applying a moderate activity multiplier of 1.55 gives about 2,672 kcal/day. We display a rounded target because 2,671.875 implies false precision. A useful next step is to hold intake reasonably steady for two to three weeks, compare average morning body weight rather than one weigh-in, and adjust from the observed trend.

The example also exposes the largest uncertainty: the activity multiplier. Two people with the same age, height and weight can have different maintenance needs because of occupation, training volume, movement outside exercise, medication and measurement error in food intake. The formula is the beginning of a feedback loop, not the end.

Units, rounding and validation

  • One internal unit: imperial inputs are converted to metric before a formula runs, then converted back only for display.
  • Rounding at the end: intermediate values retain precision. We round the user-facing result once so unit conversions do not compound rounding error.
  • Plausible input ranges: forms reject values that make the model meaningless without implying that every accepted input guarantees a medically valid result.
  • Cross-checks: shared formulas have automated tests with known inputs, metric/imperial equivalence checks and boundary cases.
  • Visible assumptions: activity level, serving size, pace and sex-specific constants are shown rather than hidden in the result.

When not to rely on a result

Population equations may perform poorly during pregnancy, growth, acute illness, recovery from an eating disorder, at unusually high muscularity, or when medication or a medical condition materially changes metabolism, fluid balance or heart rate. Tools involving blood pressure, glucose, alcohol, pregnancy or body composition are educational and do not diagnose, treat or clear someone for exercise.

If a result conflicts with symptoms, laboratory findings or advice from a clinician, use the qualified assessment. For routine nutrition and training estimates, prefer trends over isolated values and change one assumption at a time so you can tell what improved the estimate.

Corrections and accountability

CaloNote is built by NomioAI's software team, not a clinic. We are responsible for implementing equations faithfully, citing the source and stating limitations plainly. If you find a formula, unit conversion or citation that does not match its source, email support@calonote.com with the page, input and expected result. Substantive corrections are reflected in the page's review date.