A Kilogram Reading, Said the Way Britain Says It
The bathroom scale shows 78.4. The screen at the surgery shows the same 78.4, because clinical records in the UK are kept in kilograms. Then you mention it to your sister, or to the bloke at the rowing club, or to yourself in the mirror in January, and none of those conversations run in kilograms at all. They run in stone.
Divide and you get 12.35 st, which is arithmetically right and conversationally useless. Nobody in Britain has ever said "twelve point three five stone". They say twelve stone five, because stone is a two-part figure: the whole stone first, then whatever is left over counted in pounds. Getting from the metric reading to that spoken form is the whole job on this page.
Why the Figure You Read Is Never the Figure You Say
The written record went metric decades ago
Everyday talk never followed
The remainder is the awkward part
Scales pick one side and stay there
Getting from 78.4 kg to a Figure You Can Say Out Loud
Two passes do it: one for the stone, one for the pounds hiding in the decimal.
Type the kilogram reading straight in
Put 78.4 into the left field and the stone figure appears as you type — there is no convert button. A comma works as well as a dot, so 78,4 parses the same way.
Switch the right side to pounds for the leftover
Search the right-hand dropdown for pound and read the total: 78.4 kg is 172.8 lb. Whole stone is that figure divided by 14, and the remainder is your pounds — 12 × 14 = 168, leaving about 5 lb.
Reverse it when someone quotes stone at you
Both boxes accept typing, so a stone figure can go into the right-hand one directly. The swap button (↔) flips the pair outright if you are working st → kg for a whole list of people.
Copy the bare figure for a form
The copy button on each field hands over the number with no unit and no thousands spacing, which is what a booking form, a club sheet or a spreadsheet cell wants. Ctrl + C inside a field strips the spacing too.
11.4 gives 11 st 5.6 lb, roughly a pound and a half heavier than you meant. Convert the pounds part first — 4 lb is 4 ÷ 14 = 0.286 st — or work through the pound field instead.The Adult Range in Decimal Stone and in Stone and Pounds
Round kilogram readings almost never land on a round stone figure, which is why the third column has to exist. Pounds are rounded to the nearest whole pound, the way anyone would actually quote them.
| Reading in kilograms | Stone as a decimal | Stone and pounds | How it gets said |
|---|---|---|---|
| 50 kg | 7.874 st | 7 st 12 lb | "Seven twelve" |
| 55 kg | 8.661 st | 8 st 9 lb | "Eight nine" |
| 60 kg | 9.448 st | 9 st 6 lb | "Nine and a half, near enough" |
| 65 kg | 10.236 st | 10 st 3 lb | "Just over ten stone" |
| 70 kg | 11.023 st | 11 st 0 lb | "Eleven stone dead" |
| 76.2 kg | 12.000 st | 12 st 0 lb | Twelve stone almost to the gram |
| 80 kg | 12.598 st | 12 st 8 lb | "Twelve eight" |
| 90 kg | 14.173 st | 14 st 2 lb | "Fourteen stone and a bit" |
| 100 kg | 15.747 st | 15 st 10 lb | "Coming up on sixteen" |
Two anchors are worth committing to memory. Twelve stone is 76.204 kg, which puts a familiar landmark right in the middle of the adult range. And half a stone is seven pounds, or 3.175 kg — small enough that a metric reading can slide by three and a bit without the stone digit moving at all, which is exactly why the same fortnight can feel like progress in one unit and nothing whatsoever in the other.
Small Things That Save a Second Conversion
Live on every keystroke
The stone figure moves while you are still typing the kilograms, so trying 78.4 and then 78.9 costs nothing and needs no button.
Pounds are one search away
Both dropdowns are searchable and carry all 18 weight units, so the same reading can be shown in pounds when you want the remainder spelled out.
Runs in either direction
Type into whichever box you have a number for, or press swap to reverse the pair when the conversation arrives in stone rather than kilograms.
A number a form will accept
Copy gives the digits alone, so nothing needs tidying up after pasting into a registration field or a tracking sheet.
Questions About Stone and a Metric Scale
Why do only Britain and Ireland still weigh people in stone?
Because metrication was carried through where it could be enforced and left alone where it could not. Trade, medicine, science and packaging changed over; private speech was never legislated for, and body weight is almost entirely private speech. Irish usage inherited the same habit and has kept it alongside a thoroughly metric officialdom. The United States shares the imperial pound but dropped the stone from ordinary use long ago and quotes body weight as a plain pound figure, which is why an American reads "11 stone 4" as a riddle rather than a weight.
The answer says 12.34 stone — what do I do with the .34?
Multiply it by fourteen and round: 0.34 × 14 = 4.8, so 12.34 st is twelve stone five. The trap is reading the tail as though it were tenths of ten, which understates the answer by up to four pounds. Useful checkpoints along the way: .07 is one pound, .14 is two, .21 is three, .36 is five, .50 is seven and .93 is thirteen. Anything above .96 has effectively arrived at the next whole stone.
Why does the surgery store kilograms if the nurse then tells me in stone?
The stored value has to feed calculations. Drug amounts, fluid volumes, anaesthetic figures and growth charts are all built on the metric number, and a unit conversion sitting between a patient record and a prescription is a well-known place for mistakes to happen, so the record stays in one unit end to end. Saying it back in stone is a translation for the person in the chair, nothing more. If the metric value matters to you, note it down on the day: regenerating stone from kilograms is trivial, whereas a stone figure written down and converted back later carries whatever rounding the conversation happened to apply.
Is "half a stone" a real milestone or just a British habit?
A habit, and a fairly arbitrary one, though it happens to be a sensible size of step. Seven pounds is 3.175 kg: enough that clothes notice, little enough to stay within reach, which is why slimming groups, charity challenges and pub bets all settled on it. Nothing physiological changes at that boundary. Somebody counting in kilograms picks 5 kg instead, which is 11 lb, and reaches their milestone at a completely different moment for no better reason than the shape of their unit.
How is stone written properly — st, sts, or 11st4?
The symbol is st, lower case, with no full stop and no plural s. After a numeral the word itself also stays singular in British usage: twelve stone, never twelve stones. The composite carries both units, 11 st 4 lb, shortened to "11 st 4" in speech and headlines. The one form worth avoiding is a bare "11.4 st", since a reader cannot tell whether four pounds or nearly six was intended. Where a form gives you a single numeric box, put in kilograms or total pounds — both are unambiguous, and the box will not take two numbers anyway.
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