Why publish the checks?
A polished result box is not evidence that the arithmetic is right. A useful calculator should make it possible to reproduce the calculation with a pencil, spreadsheet, or separate implementation. That is why each WellnessCalcs tool shows its formula and at least one reference case on the page.
This record collects those cases in one place and dates the latest full-site check. It is a technical verification record, not a clinical validation study. Passing a reference case shows that the code applies the documented equation to that example. It does not show that a population equation accurately predicts one person’s health, energy needs, body composition, or pregnancy dates.
Current release
Reference results checked September 6, 2026
Result: all six reference calculations matched the outputs published on their calculator pages. Input guards for the listed invalid cases were also present in the current browser code.
| Calculator | Reference input | Expected result | What was checked |
|---|---|---|---|
| Calories & macros | 70 kg, 175 cm, age 30, male term, moderate activity, maintenance | BMR 1,649 kcal; TDEE 2,556 kcal/day | Mifflin–St Jeor arithmetic, 1.55 activity factor, and adult-age guard |
| Adult BMI | 70 kg and 175 cm | BMI 22.9; normal screening range | Metric equation, display rounding, and equivalent U.S.-unit conversion |
| BMR | 70 kg, 175 cm, age 30 | Male term: 1,649 kcal/day; female term: 1,483 kcal/day | Both equation constants, rounding, and age limits |
| Body-fat estimate | Male term: 70 in height, 36 in waist, 15 in neck | 21.3% | Base-10 logarithms, display rounding, unit conversion, and impossible combinations |
| Waist-to-height ratio | 35 in waist and 70 in height | 0.50 | Ratio, equivalent metric inputs, and waist-at-least-height rejection |
| Pregnancy due date | LMP January 1, 2026 with a 28-day cycle; day-5 IVF transfer January 1, 2026 | October 8, 2026; September 19, 2026 | 280-day LMP interval, 261-day day-5 transfer interval, date parsing, and range guards |
Conversion and boundary checks
The calculators normalize U.S. measurements before applying equations that use metric or inch inputs. The current implementation uses exactly 0.45359237 kilograms per pound and 2.54 centimeters per inch. The BMI case above was repeated with 154.3 pounds and 68.9 inches; the small input rounding still produced the same displayed BMI of 22.9.
Tests also cover the less visible behavior that prevents a plausible-looking but meaningless number. Examples include blocking ages outside 18–100 on adult energy tools, heights outside the documented adult range, a body-fat waist measurement that is not larger than the neck measurement for the male equation, a waist-to-height input where the waist equals or exceeds height, a future pregnancy start date, and an LMP cycle length outside 20–45 days.
Those limits are validation choices, not biological rules. They keep this particular implementation within the scope it explains. A blocked input does not imply anything about a person’s health.
Manual behavior checks
Arithmetic is only one part of a working calculator. The September 2026 review also checked that results start hidden, a reset clears a prior result, method-dependent pregnancy and body-fat fields update when the selection changes, error messages appear next to the form, and calculator entries remain in the browser rather than being submitted to WellnessCalcs.
Mobile form controls, keyboard labels, result focus, internal links, canonical URLs, and one-page-one-title basics are checked separately from the formula cases. If a visitor can produce a different result from the listed inputs, that is treated as a reproducible defect rather than a matter of opinion.
What these tests do not establish
They can establish
- The shown equation and code agree for known examples
- Conversions produce the expected displayed result
- Documented range checks block selected invalid inputs
- A future code change can be compared with a stable baseline
They cannot establish
- That a population estimate fits an individual
- That a body measurement diagnoses health
- That calorie or macro targets are medical nutrition therapy
- That an online pregnancy date replaces clinical dating
No medical-review claim
WellnessCalcs does not have a named clinician reviewing this release. The pregnancy calculator and pregnancy guide are kept free of advertising while that remains the case. They are provided as transparent date arithmetic only.
Change log
| Date | Release | Material change |
|---|---|---|
| September 6, 2026 | Trust and advertising review | Rechecked the six published reference cases; added this public verification record; removed advertising code from 404, contact, policy, guide-index, and pregnancy pages; retained the existing formulas and calculator outputs. |
| July 23, 2026 | Focused calculator release | Published six calculators with visible equations, worked examples, limitations, sources, and reference cases. Added dedicated guides for calorie estimates, activity levels, BMI limits, circumference estimates, waist-to-height ratio, and pregnancy dating. |
Report a result that does not match
Use the contact form and include the calculator URL, selected units, every input, the result shown, and the browser or device used. Do not send medical records or other sensitive information. Reproducible arithmetic, conversion, accessibility, and broken-link reports receive priority.