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Banana Standard

We use 17.78 cm (7 in) as the average banana length — the typical size of a medium Cavendish banana.


For weight, we use 170 g (6 oz) — the average weight of a medium banana with peel.

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Converting stone to milligrams (st to mg)

Conversion Formula

To convert stone to milligrams, use the formula: mg = st × 6,350,290

When to Use This Conversion

Stone is the traditional unit for body weight in the UK and Ireland.

Quick Reference

Looking to convert st to mg? Our calculator handles weight conversions instantly. Plus, see your result in bananas for a fun visual reference!