Metric load / Mass

Most civilization are acquainted with words “weight”, part may additionally know the term “mass”. For many things in day-to-day usage, they average pretty lot the same. You might come throughout the ax “mass” in recommendation to human body mass or your BMI (body massive index). That is just a case of measure up how heavy something is.

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If you have to pick something up, the is great to understand how heavy it is, and in the metric mechanism it would certainly be measured in kilograms. Note that the prize kg is offered both because that 1 kilogram or several kilograms, e.g. 75 kg way 75 kilograms.

The kilogram is also divided right into 1000 parts called grams. It is straightforward to remember as kilo in ~ the begin of a word method thousand, therefore 1 kilogram = 1000 grams.

The symbol because that grams is g, so 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, weight of family members furniture and big objects, bag of rice
tonnet1000 kgweights of cars, boats, ships
megagramMg1 tonnerarely used, tonne is preferred
megatonneMt1 million tonnesmegatonne is not actually used, although theoretically it might be supplied as a unit of mass.However the term megaton is supplied as a unit that energy, indistinguishable to the lot of energy in an explosion resulted in by 1 million tonnes of TNT.

Your weight, additionally known as body mass, can be measure in kilograms. If you have actually a collection of scale to weigh yourself, girlfriend will more than likely see kilograms or kg significant on the scale. If girlfriend have digital scales, they have the right to usually be collection to one of two people kg or stone-age units. Collection it come kg, get on the scales and also measure your body mass. Median weights for males are approximately 66 kg (based on elevation of 173 cm), and also for women approximately 60 kg (based on elevation of 165 cm). These numbers are likewise based on a BMI of 22. Back the load of babies vary, the average birth weight of 3.4 kg remains fairly constant.

BMI (Body mass Index)

To calculate your BMI, use the complying with formula: mass separated by elevation squared. Fixed measured in kilograms, and also height in metres, so that for a typical man we have actually 66 kg / (1.73m×1.73m) = 22.0 (remember that 1 metre = 100 cm, see length page for an ext info). This is a healthy BMI, together is any kind of figure between 20 and 25. Below 20 method you are underweight, e.g. 60 / (1.75×1.75) = 19.5 i beg your pardon is contempt underweight.

A more extreme case might be such as a guy weighing 55 kg yet he is 1.80 metres tall, which way his BMI = 55 / (1.8×1.8) = 17.0 — if your BMI is that low girlfriend should try to put on some weight.


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

If you room buying water, the bottles room always marked in litres (see volume page). 1 litre the water weighs 1 kg, for this reason if you space going come buy lots of water, make sure you can carry as plenty of kilograms together there room litres, e.g. If girlfriend can carry 5 kg, then you can buy 5 litres. Many other liquids/drinks space heavier 보다 water, for this reason remember the 1 litre of other drinks will certainly be contempt heavier 보다 1 kg.

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

To measure weights smaller 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 supplied in science and medicine, and you may find that pills and also tablets for vitamins or medicines have values of materials in mg or µg. Periodically though µg will be created as mcg, together the prefix µ is a Greek letter and also not basic to form on part systems.

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How space the units of weight defined?

Weight is a factor of length. When we begin with the length of one metre, which to be carefully defined (see page on length) we deserve to divide that into 100 same parts, dubbed centimetres. We have the right to then calculate volume in cubic centimetres. If us then take it 1 cubic centimetre of water, in ~ room temperature (20°C), we can specify this as having actually a massive of 1 gram. Us can additionally say that 1000 cm3 that water deserve to be defined as 1 litre in volume, and that very same volume at room temperature of 20°C has a mass of 1 kilogram. So you have the right to see, this is how we obtain the kilogram, and you deserve to see the weight (mass), volume and also length room all inter-related, which provides calculations in metric an extremely easy. 1 litre that water weighs 1 kg.