Metabolism & nutrition calculators
Metabolism & nutrition calculators — 2 tools, each showing the formula it uses, the source that published it, and the date that source was last checked.
Intermittent fasting calculator
This works out when a time-restricted eating window opens and closes from the time of your last meal, for 16:8, 18:6, 20:4 and one meal a day. It also shows how much of the fast falls while you are asleep. It is clock arithmetic, and it does not recommend a schedule or predict a result.
Biological age calculator
This adds up life-expectancy differences that five studies published in years - for smoking, activity, diet, alcohol and body weight - and subtracts them from your age. It reports a range, never one number, and shows every figure with the paper it came from. The addition is ours; none of those studies did it.
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