Metric load / Mass

Most world are familiar with words “weight”, some may likewise know the ax “mass”. For most things in daily usage, they mean pretty lot the same. You can come throughout the term “mass” in reference to body mass or her BMI (body fixed index). That is simply a situation of measure up how hefty something is.

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If you have to pick something up, that is great to recognize how heavy it is, and in the metric device it would be measure up in kilograms. Note that the price kg is used both because that 1 kilogram or number of kilograms, e.g. 75 kg means 75 kilograms.

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

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

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

Your weight, also known together body mass, deserve to be measure in kilograms. If you have a set of scales to sweet yourself, you will most 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. Set it come kg, get on the scales and measure your body mass. Average weights for males are about 66 kg (based on elevation of 173 cm), and for women roughly 60 kg (based on elevation of 165 cm). These numbers are also based on a BMI the 22. Return the weight of babies vary, the typical birth weight of 3.4 kg remains fairly constant.

BMI (Body mass Index)

To calculate her BMI, usage the complying with formula: mass separated by elevation squared. Fixed measured in kilograms, and also height in metres, so the for a common 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, as is any figure in between 20 and also 25. Below 20 way you room underweight, e.g. 60 / (1.75×1.75) = 19.5 i beg your pardon is contempt underweight.

A much more extreme instance might be such as a man 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 you should shot to placed on part weight.


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

If you are buying water, the bottles space always marked in litres (see volume page). 1 litre of water weighs 1 kg, therefore if you room going to buy several water, make sure you can carry as countless kilograms as there room litres, e.g. If girlfriend can bring 5 kg, then you might buy 5 litres. Many other liquids/drinks space heavier 보다 water, so remember the 1 litre of other drinks will be contempt heavier than 1 kg.

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

To measure up 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 supplied in science and also medicine, and also you may discover that pills and tablets because that vitamins or medicines have values of components in mg or µg. Periodically though µg will be composed as mcg, as the prefix µ is a Greek letter and not basic to form on some systems.

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How room the systems of load defined?

Weight is a factor of length. As soon as we start with the length of one metre, which was carefully characterized (see web page on length) we deserve to divide that right into 100 equal parts, dubbed centimetres. We can then calculate volume in cubic centimetres. If us then take it 1 cubic centimetre of water, at room temperature (20°C), we can specify this as having a massive of 1 gram. We can likewise say the 1000 cm3 the water deserve to be identified as 1 litre in volume, and that exact same volume in ~ room temperature that 20°C has actually a fixed of 1 kilogram. So you can see, this is how we get the kilogram, and also you can see the weight (mass), volume and length room all inter-related, which renders calculations in metric very easy. 1 litre of water weighs 1 kg.