Tools for growing families
Small questions about growing up, worked out properly.，
Height, weight and BMI. Vision and teeth. Sleep and nutrition. Start from one specific question and either work it out or look it up.
No accountWorked out in your browserEvery number names its source
Two measurements
Works nowTwo heights — how much growth?
Growth
+2.5cm
2026.03.01 — 2026.09.01 · 184 days apart
- 123.5 cm
- Earlier
- 126.0 cm
- Later
- 184 days
- Over
This is one number minus another, and one date minus another. Not a velocity percentile, and no verdict on whether it was enough. Change a figure and see.
By question
What do you want to work out?
No wading through a whole category of checks — each has its own way in.
Start with one
These work right now
The answer comes only from what you type. Type it and you have it.
Child BMI calculator
The BMI figure first, then where it sits among children the same age.
Against a referenceOpenVisual acuity notation converter
The same acuity, written another way.
ComputesOpenTooth eruption timing
When a particular tooth usually comes through.
Against a referenceOpenChild height percentile calculator
One height measurement, placed among children of the same age and sex.
Against a referenceOpenGrowth chart maker
The height records you already have, plotted at their real spacing in time.
ComputesOpenChildren’s sleep duration reference
How much sleep is recommended at this age, and by whom.
Against a referenceOpenHeight growth calculator
Two heights, and the growth between them.
ComputesOpenHeight percentile to centimetres
A percentile at a given age, in centimetres.
Against a referenceOpenChild weight percentile calculator
One weight measurement, placed among children of the same age and sex.
Against a referenceOpenWeight change calculator
Two weigh-ins, and the difference between them.
ComputesOpenScreen and outdoor time reference
What each body says about screen time and outdoor time, by age.
Against a referenceOpenSleep duration calculator
How long a day’s sleep came to, from the times you wrote down.
ComputesOpenNutrient reference intake lookup
Reference intakes for this age, nutrient by nutrient.
Against a referenceOpenFeeding and diet reference
What each body says about food at this age.
Against a referenceOpenNutrition label intake calculator
The label says per 100 grams. This portion is how much?
ComputesOpenWhat each answer covers
Every number has something it cannot tell you.
Differences and durations come from what you type; anything age-related comes from a named source. Standards from different countries are never stitched into one answer — they were never the same thing.
Light tools. Not report interpretation.
No uploading a health check report, no reading of lab results, no diagnosis, no supplement plans. Finish and leave — nothing here is locked behind installing an app.