2 pounds to stones

Two pounds is 0.1429 of a stone, and the digits never stop

Two pounds is 0.142857 stone, and no short decimal will ever finish that number. One stone is 14 pounds, so the sum is 2 divided by 14, which reduces to 1 divided by 7. Long division gives 0.142857142857 and keeps going. Four decimal places, 0.1429, is what most people write, and it is close enough for a bathroom scale.

The same two pounds in the other units:

Going back the other way is one multiplication: 0.142857 x 14 = 1.999998, which rounds to 2. That tiny gap is why a calculator that shows 0.14 st will hand you back 1.96 lb, not 2.

A UK scale says 0 st 2 lb, never 0.14 st

British and Irish bathroom scales do not print a decimal stone. They print two numbers side by side, like 11 st 4 lb, and the pounds part only runs from 0 to 13. A two pound reading is the second small mark past a whole stone, so a dial scale with 14 marks per stone moves two marks. A digital scale set to stones and pounds shows 0 st 2 lb if you are standing on it with nothing else, or 10 st 2 lb if you started at ten stone.

The toggle on the back of those scales usually cycles through kg, st and lb. On most models the stone mode is marked "st:lb" and the pound mode is a plain "lb". Reading the wrong one is the most common mistake with these scales: 11 st 4 lb is 158 lb, while a display that says 11.4 in pound mode is just 11.4 lb. The decimal point is the tell.

If you only have a US scale, the reading you want is pounds. Multiply the stones by 14 and add the leftover pounds: 11 st 4 lb is (11 x 14) + 4 = 158 lb. To go the other way, divide the pounds by 14 and keep the remainder: 158 divided by 14 is 11 with 4 left over, so 11 st 4 lb. Two pounds is the case where the remainder is 2 and the whole-stone part is zero.

How people say a seventh of a stone out loud

Nobody stands on a scale in Manchester and announces 0.1429 stone. The spoken units are pounds under a stone and fractions of a stone above it. Two pounds is "a couple of pounds", or "two pound" in the singular form that is normal in British speech. The fraction words that do get used are the quarter, the half and the three quarters, because those land on whole or half pounds.

Two pounds is one seventh of a stone, and that fraction is almost never spoken as "a seventh". It comes up in the other direction, when someone says they are "two pound off twelve stone". A target like that is 166 lb, since 12 x 14 = 168 and 168 minus 2 = 166. UK diet groups talk in pounds for the weekly change and in stones for the total, which is why the small conversion gets used more often than the big one.

The 14 pound stone is written into UK law

The stone is not a folk unit with a fuzzy size. Schedule 1, Part VI of the Weights and Measures Act 1985 defines it in one line: Stone = 14 pounds. The same schedule defines the pound as 0.45359237 kilogram exactly, which is where every number on this page comes from.

The US side has an official description too. Appendix B of NIST Handbook 44, 2024 edition says the stone, quarter, hundredweight and ton were larger British mass units, that the present stone is 14 pounds, and that today only the stone continues in customary use, for personal body weight. The same appendix notes that the stone is not used in the United States, though flour was sold by the 196 pound barrel, exactly 14 stone, until World War II.

That official status is why NHS weight handouts print a stones and pounds column next to the kilogram column. A typical NHS weight loss chart, such as the My Health London chart used in several London trusts, is ruled in stone and pounds down the side in 1 lb steps, and the advice printed on it is a loss of about 1 to 2 lbs a week. In stones, that guidance is 0.07 to 0.14 st a week.

Worked example: 2 lb a week for seven weeks is one stone

This is the calculation people run in their heads at the start of January, and it is worth doing on paper once. Two pounds a week, seven weeks. The arithmetic is 2 x 7 = 14, so the total is exactly 14 lb, which is one stone. The halfway point is worth marking too: after four weeks you are 8 lb down, or 0.5714 st.

A 2 lb week is inside the 1 to 2 lb range that NHS patient leaflets describe as gradual and sustainable, and it sits at the top of that range. At 1 lb a week the same stone takes 14 weeks. Over a full year the difference is 104 lb against 52 lb, or 7.4 st against 3.7 st, which is why the weekly number matters more than any single weigh-in.

One warning about the scale itself: body weight swings 1 to 3 lb a day on water and food alone, which is 0.07 to 0.21 st. A single 2 lb drop the morning after a light dinner is noise, not a trend. Compare the same day of the week, at the same time, and look at the four week change.

Kilograms and ounces behind the two pounds

The kilogram figure comes from the exact definition of the pound, 0.45359237 kg. Two of those is 0.90718474 kg, and in grams that is 907.18474 g. Most of the world would call that 0.91 kg, and a gym app rounding to one decimal shows 0.9 kg, which is 1.98 lb. The 0.02 lb lost there is a third of an ounce.

Ounces are simpler because the avoirdupois pound is 16 ounces by definition, so 2 lb is 32 oz. That matters for parcels and for kitchen scales: a 2 lb bag of sugar is 32 oz, and a recipe written in ounces will call for 32 of them.

The comparison that catches people out is the airline bag. A 23 kg allowance is 50.71 lb, which is 3 st 8.7 lb. A 2 lb item is 4 percent of that allowance, so it is not the thing that gets you charged at the gate. A 2 kg overage is 4.41 lb, more than twice as much.

Gym plates, parcels and luggage: where 2 lb shows up

Gyms are mixed unit territory. A 1 kg plate is 2.2046 lb, so a pair of them is 4.41 lb, and a 2 lb jump on a bar is under one kilogram. If a program says add 2 lb a week to a lift, that is 0.91 kg a week, which most plate sets cannot load exactly. The nearest real jump is 1 kg, or 2.2 lb, so the plates run 0.2 lb ahead each week, and over eight weeks that is 1.6 lb.

Postal rates are usually bracketed in pounds in the US and in grams in the UK, so a 2 lb parcel sits at 907 g. That is just under the 1 kg bracket many UK carriers price at, which is a useful place to land if the box itself is light.

For travel, the number to memorise is that one stone is 14 lb and one kilogram is 2.2 lb. With those two, any scale reading in any airport can be checked in your head. A 20 kg limit is 44.1 lb, or 3 st 2.1 lb. A 50 lb limit is 22.68 kg, or 3 st 8 lb.

Rounding 0.1429, and the four mistakes that follow

Every wrong answer on this conversion comes from one of four moves. The table shows how far off each rounding lands when you multiply the decimal back by 14.

Mistake one is dividing by 16 instead of 14, which is the ounce reflex. That gives 0.125 st, or 1.75 lb. Mistake two is multiplying where you should divide: 2 x 14 = 28, which is the answer to the opposite question. Mistake three is subtracting 14 from 2 and reporting a negative stone count. Mistake four is treating the decimal part of a stone reading as pounds, so 11.4 st gets read as 11 st 4 lb when it is 11 st 5.6 lb.

The safe habit is to keep four decimals while you work and round only the final line. If you are writing a number on a form, 0.14 st is acceptable for a two pound entry, because no scale in a doctor's office resolves finer than that. If you are converting back to pounds, use 0.1429 or use the stones and pounds form and skip the decimal entirely.