Changelog
By Rick Campbell · Updated · Sourced to primary literature · Not medical advice
What changed on this site, when, and why. Our editorial policy says that confirmed errors in a formula or threshold are fixed immediately and locked with a test so the same error cannot return. This page is where that is kept in public, including the corrections that were nobody's finest hour.
Dates are the day the change shipped. A change to a calculator or guide also updates the date shown at the foot of that page.
Changes
· Added
A weight-loss path and twelve calculators that keep you in control of the plan
A /weight-loss-tools hub now orders the job: measure, composition, energy, pace, fuel, move, check, exit. New tools cover safe weeks to a goal, expected versus actual check-ins, recomposition, reverse dieting, a visceral-fat tape proxy, energy in body fat, metabolic age (labelled as marketing), fasting windows, walking and running sessions, alcohol versus the calorie budget, and fibre targets. Seven guides and two charts sit beside them. The deficit calculator still has no goal-date countdown.
· Corrected
The Army replaced its body fat standard, and this site now says so
Army Directive 2026-13 took effect on 7 July 2026 and replaced the height and weight tables, the circumference tape test and the supplemental body fat assessments with a single waist-to-height ratio, compliant below 0.55, assessed twice a year. Our army page still described the 2023 tape system as current. It now leads with the ratio check and keeps the AR 600-9 percentage limits as clearly labelled history, because they are what most people were measured against for decades.
· Corrected
Four citations pointed at the wrong record
Two calculators linked body fat percentage to a Wikidata entity for a Canadian racehorse. The child BMI severe-obesity thresholds cited a DOI that resolves to a 2019 cardiovascular statement rather than the 2013 paper the figures come from. The Owen equation for men carried the women's publication year. The Army regulation link had gone dead. All four are fixed, and every remaining entity identifier on the site was checked against Wikidata.
· Corrected
The child BMI calculator would not accept a young child
Its form validated height and weight against the adult floors of 100 cm and 25 kg, so a parent of a two to six year old could not enter real measurements at all, even though the engine behind it accepts them. It now uses child limits. The percentile also stopped reporting 100th for very high readings, which was an artefact of the scale rather than a real position.
· Added
A VO2 max calculator with four published field tests
Estimates maximal oxygen uptake from the heart rate ratio, the Cooper twelve-minute run, the Rockport one-mile walk or a 1.5-mile submaximal run, each carrying the error its own paper reports, converted to metabolic equivalents and placed against published treadmill percentiles for your age and sex. The walk equation is implemented in the litres per minute the 1987 paper actually published, not the per-kilogram coefficients that circulate without a readable source.
· Added
Height and weight percentiles for children, and a target adult height
Stature-for-age and weight-for-age percentiles and z-scores for ages 2 to 20 on the CDC parameters, alongside the mid-parental target height that explains most of why a healthy child is short or tall. The generator refuses to publish a table unless it reproduces the CDC's own percentile columns, and the shipped table does so to within three parts in a billion.
· Added
Nine guides on eating, training, and children and pregnancy
How many calories to eat, how much protein the evidence supports, how to set macros, and why a plateau is rarely your metabolism. Then heart rate zones, estimating a one-rep max, and what a MET value can and cannot tell you about calories burned. Finally, child BMI percentiles and pregnancy weight gain. Each is about 2,500 words with its own comparison tables and sources.
· Changed
Two calculators were giving you less than the rest
The relative fat mass and child BMI pages returned a number where the BMI and body fat pages return a number, its error band, a reference table with your row marked, and independent second opinions. Both now do the same. Relative fat mass solves its own equation backwards to show the waist at each interpretation band for your height; child BMI shows the distance to the next threshold in BMI points rather than percentile points.
· Changed
Every page now shows how to cite it, and a thin page fails the build
Calculators and guides carry a ready-made reference with the page's own address. Separately, an automated gate now refuses to publish a calculator with fewer than 1,200 words, six sections, six answered questions, its formulas, a worked example, real-world uses or two primary sources, so thin content cannot creep back in one page at a time.
· Changed
The methodology and reference pages were rebuilt from one bibliography
Every study, standard and government publication cited anywhere on the site is now registered once, grouped by topic, with each DOI resolved and each other link fetched before listing. The methodology page writes out the formulas in seven topic groups, and states plainly on each section that carries a convention rather than a published standard that no primary source exists for it.
· Added
Child and teen BMI percentiles, on the CDC growth reference
The adult calculators refuse to run for anyone under 18, which was correct but left that visitor with nowhere to go. BMI-for-age percentiles now cover ages 2 to 20, using the CDC's published LMS parameters interpolated to the exact age in months, with percent-of-the-95th-percentile for values above the reference range.
· Added
Shape and distribution indices: Relative Fat Mass, Body Roundness Index, waist circumference
Three tools that read fat distribution rather than total mass, each with its published equation, its interpretation bands where they exist, and an explicit statement where they do not: A Body Shape Index has no universal cut-off, and the page says so instead of inventing one.
· Added
Every calculator now shows its formula, a worked example and its sources on the page
Formulas previously lived only on the methodology page. Each calculator now carries the equations it uses, a full arithmetic walk-through with real numbers, the real-world settings the number is used in, and a visible reference list mirrored into the page's structured data.
· Changed
Results are announced to screen readers, and errors are summarised once
A single polite live region now exists before any result does, so the first result is announced rather than silently appearing, and repeated keystrokes no longer flood it. Submitting an incomplete form produces one error summary instead of a burst of separate alerts.
· Corrected
Switching units no longer changes what your numbers mean
Previously, typing 175 in centimetres and then switching to imperial left 175 in the field, where it was read as inches. Every unit-bearing value is now converted when the unit system changes.
· Corrected
The army body fat page posts to itself without JavaScript
Its form carried the hidden identifier of the Navy body fat page, so a visitor with JavaScript disabled was redirected to a different calculator after pressing the button. Every form now posts its own address, and a test checks that for all of them.
· Changed
Only the calculator on the page is loaded into the browser
The site previously sent one bundle containing every calculator and every guide's prose to every visitor. Each calculator is now its own island: a content page ships no JavaScript at all, and a calculator page loads only its own form.
· Added
First publication: eighteen calculators, ten guides and the trust pages
Launched with the classification systems shown side by side, published error bands printed next to results, calorie safety limits enforced in the calculation code, and no claim of medical review.
Most recently updated pages
Every calculator and guide carries the date of its last substantive content change. These are the twelve most recent.
| Page | Updated |
|---|---|
| Alcohol and the calorie budget | 2026-09-15 |
| Fasting windows and calories | 2026-09-15 |
| What metabolic age actually is | 2026-09-15 |
| Reverse dieting after a cut | 2026-09-15 |
| Body recomposition versus weight loss | 2026-09-15 |
| How to read a weekly weigh-in | 2026-09-15 |
| How long does safe weight loss take? | 2026-09-15 |
| Fibre Intake Calculator | 2026-09-15 |
| Alcohol Calorie Calculator | 2026-09-15 |
| Running Calorie Calculator | 2026-09-15 |
| Walking Calorie Calculator | 2026-09-15 |
| Intermittent Fasting Calculator | 2026-09-15 |
How to report an error
Email the page and what you believe is wrong: a formula, a threshold, a citation, a broken result. A confirmed error in a calculation is fixed immediately, covered by a new automated test, and recorded here. The address and the full process are on the contact page.
Last updated . Written by Rick Campbell; not medically reviewed. See review status.