Metric weight / Mass

Most people are acquainted with words “weight”, part may also know the ax “mass”. For most things in day-to-day usage, they mean pretty much the same. You might come across the ax “mass” in referral to body mass or your BMI (body mass index). The is just a case of measuring how hefty something is.

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If you have to pick miscellaneous up, it is an excellent to know how hefty it is, and also in the metric mechanism it would be measured in kilograms. Keep in mind that the prize kg is supplied both for 1 kilogram or several kilograms, e.g. 75 kg means 75 kilograms.

The kilogram is likewise divided into 1000 parts called grams. The is straightforward to remember together kilo in ~ the begin of a word method thousand, therefore 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 large 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 can be offered as a unit the mass.However the hatchet megaton is provided as a unit of energy, indistinguishable to the quantity of energy in one explosion brought about by 1 million tonnes of TNT.

Your weight, additionally known as body mass, can be measured in kilograms. If you have actually a set of scale to sweet yourself, girlfriend will most likely see kilograms or kg marked on the scale. If girlfriend have digital scales, they can usually be collection to one of two people kg or stone-age units. Collection it come kg, gain on the scales and also measure your body mass. Median weights for males are around 66 kg (based on height of 173 cm), and also for women about 60 kg (based on height of 165 cm). These numbers are likewise based top top a BMI that 22. Back the weight of babies vary, the median birth weight of 3.4 kg remains fairly constant.

BMI (Body fixed Index)

To calculate your BMI, usage the adhering to formula: mass divided by elevation squared. Fixed measured in kilograms, and also height in metres, so the for a usual man we have actually 66 kg / (1.73m×1.73m) = 22.0 (remember that 1 metre = 100 cm, see length page for more info). This is a healthy BMI, together is any figure between 20 and also 25. Listed 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 situation might be such as a male weighing 55 kg however he is 1.80 metres tall, which way his BMI = 55 / (1.8×1.8) = 17.0 — if her BMI is that low friend should shot to placed on some weight.


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

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

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

To measure weights smaller sized than 1 gram, we have the right to 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 also you may uncover that pills and tablets because that vitamins or medicines have actually values of materials in mg or µg. Occasionally though µg will certainly be written as mcg, together the prefix µ is a Greek letter and also not easy to type on part systems.

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How space the devices of load defined?

Weight is a variable of length. Once we start with the length of one metre, which was carefully identified (see page on length) we can divide that right into 100 equal parts, called centimetres. We have the right to then calculate volume in cubic centimetres. If we then take 1 cubic centimetre the 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 identified as 1 litre in volume, and also that exact same volume at room temperature that 20°C has actually a fixed of 1 kilogram. For this reason you have the right to see, this is how we obtain the kilogram, and you have the right to see the weight (mass), volume and length space all inter-related, which provides calculations in metric really easy. 1 litre the water weighs 1 kg.