Metric weight / Mass

Most civilization are familiar with the word “weight”, some may additionally know the term “mass”. For many things in day-to-day usage, they average pretty lot the same. You could come across the hatchet “mass” in reference to body mass or her BMI (body massive index). The is just a case of measuring how heavy something is.

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If you need to pick other up, it is great to know how hefty it is, and also in the metric system it would be measured in kilograms. Note that the price kg is provided both because that 1 kilogram or several kilograms, e.g. 75 kg method 75 kilograms.

The kilogram is also divided into 1000 parts referred to as grams. It is easy to remember as kilo at the start of a word method thousand, therefore 1 kilogram = 1000 grams.

The symbol because that grams is g, therefore 1000 g = 1 kg.

Name of unitSymbolEquivalentTypical items measured in this unit
microgramµg0.000 001 gmedicine
milligrammg1000 µgmedicine
gramg1000 milligramssmall amounts of food or jewellery
kilogramkg1000 gbody mass, load of household furniture and big objects, bag the rice
tonnet1000 kgweights that cars, boats, ships
megagramMg1 tonnerarely used, tonne is preferred
megatonneMt1 million tonnesmegatonne is not actually used, although theoretically it could be used as a unit that mass.However the ax megaton is provided as a unit that energy, equivalent to the quantity of power in one explosion brought about by 1 million tonnes the TNT.

Your weight, likewise known together body mass, deserve to be measure in kilograms. If you have a set of scale to sweet yourself, girlfriend will probably see kilograms or kg significant on the scale. If girlfriend have digital scales, they can usually be set to one of two people kg or stone-age units. Collection it to kg, get on the scales and also measure her body mass. Average weights for men are roughly 66 kg (based on elevation of 173 cm), and also for women about 60 kg (based on height of 165 cm). These figures are additionally based top top a BMI the 22. Return the weight of babies vary, the average birth load of 3.4 kg remains relatively constant.

BMI (Body massive Index)

To calculate your BMI, use the complying with formula: mass separated by elevation squared. Mass measured in kilograms, and height in metres, so that for a typical man we have 66 kg / (1.73m×1.73m) = 22.0 (remember that 1 metre = 100 cm, see size page for more info). This is a healthy and balanced BMI, together is any figure between 20 and 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 much more extreme instance might it is in such together a guy weighing 55 kg however 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 shot to put on part weight.


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

If you space buying water, the bottles space always significant in litres (see volume page). 1 litre of water weighs 1 kg, for this reason if you room going come buy numerous water, make sure you can carry as countless kilograms together there space litres, e.g. If friend can lug 5 kg, then you might buy 5 litres. Most other liquids/drinks space heavier than water, therefore 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 weights smaller sized than 1 gram, we deserve to use milligrams (mg) and micrograms (µg). 1000 mg = 1 g, 1000 µg = 1 mg, 1 000 000 µg = 1 g. These are offered in science and also medicine, and also you may discover that pills and tablets for vitamins or medicines have actually values of materials in mg or µg. Periodically though µg will certainly be created as mcg, together the prefix µ is a Greek letter and not simple to kind on part systems.

See more: 30 Km Is How Many Miles In 30 Km, Convert 30 Kilometers To Miles

How are the systems of load defined?

Weight is a variable of length. As soon as we start with the size of one metre, which to be carefully identified (see web page on length) we have the right to divide that into 100 equal parts, referred to as centimetres. We deserve to then calculate volume in cubic centimetres. If us then take 1 cubic centimetre of water, in ~ room temperature (20°C), we can define this as having a mass of 1 gram. We can also say that 1000 cm3 of water have the right to be defined as 1 litre in volume, and also that very same volume in ~ room temperature of 20°C has actually a mass of 1 kilogram. Therefore you can see, this is exactly how we obtain the kilogram, and you can see that weight (mass), volume and length space all inter-related, which makes calculations in metric really easy. 1 litre of water weighs 1 kg.