Metric weight / Mass

Most human being are familiar with words “weight”, some may likewise know the ax “mass”. For most things in day-to-day usage, they median pretty much the same. You can come throughout the hatchet “mass” in recommendation to body mass or her BMI (body mass index). That is just a case of measure how heavy something is.

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If you need to pick something up, the is good to recognize how heavy it is, and in the metric device it would certainly be measured in kilograms. Keep in mind that the prize kg is supplied both because that 1 kilogram or numerous kilograms, e.g. 75 kg method 75 kilograms.

The kilogram is also divided right into 1000 parts dubbed grams. It is straightforward to remember as kilo at the begin of a word means thousand, for this reason 1 kilogram = 1000 grams.

The symbol because that grams is g, for this reason 1000 g = 1 kg.

Name of unitSymbolEquivalentTypical items measured in this unit
microgramµg0.000 001 gmedicine
milligrammg1000 µgmedicine
gramg1000 milligramssmall quantities of food or jewellery
kilogramkg1000 gbody mass, load of household furniture and big objects, bag that rice
tonnet1000 kgweights the cars, boats, ships
megagramMg1 tonnerarely used, tonne is preferred
megatonneMt1 million tonnesmegatonne is no actually used, although theoretically it might be used as a unit the mass.However the ax megaton is supplied as a unit the energy, tantamount to the lot of power in one explosion caused by 1 million tonnes that TNT.

Your weight, also known together body mass, can be measure in kilograms. If you have a set of scale to weigh yourself, girlfriend will probably see kilograms or kg marked on the scale. If you have digital scales, they have the right to usually be set to one of two people kg or stone-age units. Set it come kg, obtain on the scales and measure your body mass. Typical weights for guys are about 66 kg (based on elevation of 173 cm), and for women about 60 kg (based on height of 165 cm). These figures are likewise based ~ above a BMI the 22. Back the weight of babies vary, the median birth weight of 3.4 kg remains reasonably constant.

BMI (Body fixed Index)

To calculate your BMI, use the following formula: mass split by elevation squared. Massive measured in kilograms, and height in metres, so that for a typical man we have 66 kg / (1.73m×1.73m) = 22.0 (remember the 1 metre = 100 cm, see length page for more info). This is a healthy and balanced BMI, together is any figure between 20 and 25. Below 20 way you are underweight, e.g. 60 / (1.75×1.75) = 19.5 i m sorry is slightly underweight.

A much more extreme case might be such as a guy weighing 55 kg but he is 1.80 metres tall, which means his BMI = 55 / (1.8×1.8) = 17.0 — if her BMI is the low friend should try to placed on part weight.


For other purposes, we have the right to use kilograms in our day-to-day lives, such as once shopping, and buying food, either pre-packed v a published weight, such together 1 kg, 2.25 kg, etc. Or loosened fruit and also vegetables, which could be priced together 74 pence every kg, or £1.20 / kg. For loosened goods the price you salary will rely on the weight of the goods, and also at the checkout these items will certainly be weighed, and also the digital scales should display screen a weight, e.g. 0.67 kg, and calculate the price, at the very least that’s how it works in modern-day supermarkets. For this reason if it to be £1 per kilogram and you purchase 670 grams the something, the price would be £1 × 0.67 kg = 67 pence. If it to be 50 pence per kilogram and you purchase 1 kg, the price would be £0.50 × 1 kg = 50 pence.

If you room buying water, the bottles are always significant in litres (see volume page). 1 litre of water weighs 1 kg, so if you are going to buy many water, make certain you can bring as many kilograms as there room litres, e.g. If you can lug 5 kg, climate you might buy 5 litres. Many other liquids/drinks space heavier 보다 water, so remember that 1 litre of other drinks will certainly be contempt heavier 보다 1 kg.

To measure bigger than kilograms, we use tonnes. 1 tonne = 1000 kg.

To measure weights smaller sized than 1 gram, we can use milligrams (mg) and also micrograms (µg). 1000 mg = 1 g, 1000 µg = 1 mg, 1 000 000 µg = 1 g. These are offered in science and medicine, and you may uncover that pills and tablets because that vitamins or medicines have actually values of contents in mg or µg. Sometimes though µg will be composed as mcg, as the prefix µ is a Greek letter and also not straightforward to form on part systems.

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How are the devices of weight defined?

Weight is a element of length. Once we begin with the length of one metre, which was carefully identified (see web page on length) we have the right to divide that right into 100 same parts, dubbed centimetres. We have the right to then calculate volume in cubic centimetres. If us then take 1 cubic centimetre of water, at room temperature (20°C), us can specify this as having actually a mass of 1 gram. We can likewise say the 1000 cm3 the water can be defined as 1 litre in volume, and that very same volume in ~ room temperature that 20°C has a mass of 1 kilogram. For this reason you have the right to see, this is just how we gain the kilogram, and you can see the weight (mass), volume and also length room all inter-related, which makes calculations in metric an extremely easy. 1 litre the water weighs 1 kg.