One Fighter, Described as 11 st 6 and as 160 lb
Read a British fight preview and the same boxer will be quoted two ways within a few paragraphs. The reporter writes that he has "come up from eleven stone six", the sanctioning body's rulebook says the division limit is 160 lb, and the scale wheeled onto the stage at the weigh-in reads 72.5 kg. Three numbers, one man, and only one of them is the number that decides whether the fight happens.
Pounds win, because the divisions were drawn in pounds and have barely moved since. Stone hangs around in the writing because it is how a British audience hears a body, and kilograms turn up because that is what a commercially certified scale in Europe displays. The stone-to-pound step is at least the easy one: it is an exact multiplication by fourteen, with no rounding to argue about.
Where Each Unit Comes From in the Fight Game
The limit itself is a pound figure
British coverage narrates in stone
The scale on the night may be metric
The weigh-in figure is not the ring figure
Matching a Stone Figure to a Division Limit
One multiplication, then a look down the class list to see where it lands.
Enter the stone value on the left
Type 11.5 for eleven and a half and the pound figure lands instantly — 161 lb — with no button to press. A comma reads the same as a dot and spaces inside the number are ignored.
Compare it against the class ceiling
161 lb is a pound over the middleweight limit of 160 and seven under super middleweight at 168, which tells you immediately which side of the division a training-camp figure sits on.
Put kilograms on the other side for the venue scale
Search the right-hand dropdown for kilogram and the same entry reads 73.0 kg, which is what a certified European scale will actually display at the official weigh-in.
Copy the figure into your notes
The copy button on either field yields the digits alone, with no unit and no thousands spacing, which is what a fight card spreadsheet or a preview draft wants. Ctrl + C inside a field does the same to a selection.
Going the other way is just as quick: the swap button (↔) turns the page into lb → st, so a rulebook limit becomes the stone figure a British reader will recognise.
Professional Boxing Divisions in Three Units
The ceilings recognised across the major sanctioning bodies. Names differ between them — super welterweight is light middleweight elsewhere, super lightweight is junior welterweight — but the pound figures line up.
| Division | Ceiling (lb) | Written in stone | Metric equivalent |
|---|---|---|---|
| Flyweight | 112 lb | 8 st 0 lb | 50.80 kg |
| Bantamweight | 118 lb | 8 st 6 lb | 53.52 kg |
| Featherweight | 126 lb | 9 st 0 lb | 57.15 kg |
| Lightweight | 135 lb | 9 st 9 lb | 61.23 kg |
| Welterweight | 147 lb | 10 st 7 lb | 66.68 kg |
| Super welterweight | 154 lb | 11 st 0 lb | 69.85 kg |
| Middleweight | 160 lb | 11 st 6 lb | 72.57 kg |
| Light heavyweight | 175 lb | 12 st 7 lb | 79.38 kg |
| Cruiserweight | 200 lb | 14 st 4 lb | 90.72 kg |
Above cruiserweight there is no ceiling at all, and heavyweight champions have ranged from around fifteen stone to well over twenty. The WBC added an intermediate bridgerweight class between the two in 2020, capped at 224 lb, which the other bodies have not adopted. The gaps also narrow as you go down the card: eight pounds separates middleweight from super middleweight, but only three separate flyweight from super flyweight, which is why the lighter divisions produce the tightest weight management.
Useful Around a Weigh-In
Exact, not approximate
Because fourteen is an exact factor, the pound result carries no rounding of its own, and results hold up to eight decimals if you need them.
Three units without leaving the page
Searchable dropdowns on both sides list all 18 weight units, so ounces for a borderline reading and kilograms for the arena scale are one search apart.
Reads the card in either direction
Type into either box, or press swap, when a rulebook limit needs turning back into the stone figure the commentary will use.
Clean values for a card sheet
Copy delivers the number by itself, so it drops straight into a results table or a draft without a unit to delete afterwards.
Weight-Class and Weigh-In Questions
Why are the limits odd numbers like 147 lb instead of round figures?
They are round in stone, not in pounds. The old British divisions were set on stone boundaries and half boundaries, so 147 lb is ten and a half stone, 112 lb is eight stone flat, 126 lb is nine, 154 lb is eleven and 175 lb is twelve and a half. The classes that look tidiest in pounds — 130, 135, 140, 160, 168, 200 — are mostly later American additions, slotted into gaps as the sport grew from eight divisions to seventeen. The result is a ladder built out of two different habits, which is precisely why one page of a preview reads in stone and the next in pounds.
How does a fighter weigh 160 lb on Friday and 175 lb on Saturday night?
Mostly water. Professional weigh-ins moved to roughly twenty-four hours before the first bell during the 1980s, which handed camps a full day to rehydrate and refeed. The last stretch of a cut is done by dehydration — restricted fluid, sweating in heat, emptying the gut — and it comes back fast once drinking resumes, so a gain of half a stone or more overnight is unremarkable in the middle divisions. Governing bodies have pushed back with extra checks: the WBC, for example, runs hydration testing during camp and a fight-day weight check with a ceiling above the division limit. It has curbed the extremes without ending the practice.
What is a catchweight bout?
A fight contracted at a weight the two camps agree on rather than at a recognised division ceiling — say 158 lb between a middleweight and someone moving up. It gets used to make an attractive match between fighters from neighbouring classes, to tempt a smaller champion upward, or to accommodate someone who can no longer make their old limit. No title belonging to a division can normally be won at a catchweight, though a champion sometimes defends under one at their own risk, and the contract usually attaches a rehydration ceiling as well so the lighter fighter is not facing a rebuilt opponent.
What happens when a fighter misses weight?
The scale is usually not the end of it. Rules commonly allow a short window — an hour or two — to shed the excess and step back on. Fail again and the bout normally still goes ahead, with penalties written into the contract: a percentage of the purse handed to the opponent, and often a glove-weight or rehydration condition added. A champion who misses forfeits the belt on the spot; the opponent can still win it by making weight and winning the fight, which produces the odd situation of a title bout that only one man can win the title in. The opponent also keeps the right to walk away, and occasionally does.
Why do amateur and Olympic classes use kilograms instead?
Because the amateur code was written for an international entry rather than an Anglo-American one, so its divisions are metric round numbers. The Paris 2024 men's programme ran at 51, 57, 63.5, 71, 80, 92 and over 92 kg, with the women's classes at 50, 54, 57, 60, 66 and 75 kg. Just as important, amateurs weigh in on the morning of each bout and may box several days in a row, which leaves no room for a day-long rebuild and keeps competitors much closer to their real fighting weight. A boxer crossing over to the professional ranks therefore has to learn a new ladder and a new relationship with the scale at the same time.
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