Metric weight / Mass

Most world are familiar with the word “weight”, part may likewise know the term “mass”. For most things in everyday usage, they median pretty lot the same. You might come throughout the ax “mass” in reference to human body mass or her BMI (body massive index). That is simply a case of measure up how heavy something is.

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If you need to pick miscellaneous up, that is good to understand how heavy it is, and also in the metric system it would be measured in kilograms. Keep in mind that the symbol kg is used both because that 1 kilogram or number of kilograms, e.g. 75 kg means 75 kilograms.

The kilogram is additionally divided right into 1000 parts referred to as grams. That is basic to remember together kilo at the begin of a word method thousand, for this reason 1 kilogram = 1000 grams.

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

Name the unitSymbolEquivalentTypical item measured in this unit
microgramµg0.000 001 gmedicine
milligrammg1000 µgmedicine
gramg1000 milligramssmall quantities of food or jewellery
kilogramkg1000 gbody mass, weight of family furniture and huge objects, bag that rice
tonnet1000 kgweights that cars, boats, ships
megagramMg1 tonnerarely used, tonne is preferred
megatonneMt1 million tonnesmegatonne is not actually used, although theoretically it might be offered as a unit that mass.However the term megaton is offered as a unit that energy, tantamount to the amount of power in one explosion resulted in by 1 million tonnes the TNT.

Your weight, also known together body mass, deserve to be measure up in kilograms. If you have a collection of scales to sweet yourself, girlfriend will probably see kilograms or kg marked on the scale. If friend have digital scales, they can usually be collection to one of two people kg or stone-age units. Set it come kg, gain on the scales and measure your body mass. Typical weights for guys are around 66 kg (based on height of 173 cm), and also for women approximately 60 kg (based on elevation of 165 cm). These numbers are likewise based top top a BMI the 22. Although the load of babies vary, the average birth load of 3.4 kg remains relatively constant.

BMI (Body massive Index)

To calculate her BMI, usage the adhering to formula: mass divided by elevation squared. Massive measured in kilograms, and height in metres, so that for a common man we have actually 66 kg / (1.73m×1.73m) = 22.0 (remember the 1 metre = 100 cm, see length page for more info). This is a healthy BMI, as is any type of figure in between 20 and also 25. Listed 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 situation might be such as a man 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 you should shot to put on part weight.


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

If you room buying water, the bottles space always significant in litres (see volume page). 1 litre of water weighs 1 kg, for this reason if you space going come buy several water, make certain you can carry as numerous kilograms as there room litres, e.g. If you can carry 5 kg, then you could buy 5 litres. Many other liquids/drinks are heavier than water, so remember that 1 litre of various other drinks will be contempt heavier than 1 kg.

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

To measure up weights smaller sized than 1 gram, we have the right to use milligrams (mg) and micrograms (µg). 1000 mg = 1 g, 1000 µg = 1 mg, 1 000 000 µg = 1 g. This are used in science and also medicine, and you may find that pills and tablets because that vitamins or medicines have values of materials in mg or µg. Periodically though µg will certainly be written as mcg, as the prefix µ is a Greek letter and also not simple to form on part systems.

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How room the devices of weight defined?

Weight is a element of length. Once we begin with the length of one metre, which to be carefully characterized (see page on length) we deserve 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), we can specify this as having actually a massive of 1 gram. We can additionally say that 1000 cm3 of water can be identified as 1 litre in volume, and also that very same volume in ~ room temperature that 20°C has a mass of 1 kilogram. For this reason you can see, this is just how we gain the kilogram, and also you have the right to see the weight (mass), volume and also length are all inter-related, which provides calculations in metric really easy. 1 litre of water weighs 1 kg.