Mass conversion

The mass calculator allows quick conversion of values between units such as micrograms (µg), milligrams (mg), grams (g), decagrams (dag), kilograms (kg), tons (t), ounces (oz), pounds (lb), and short tons (ST). Simply enter the value, select the input and target units from the dropdown lists to instantly get the result. The tool is useful both for analyzing technical documentation and for everyday warehouse, logistics, or laboratory calculations.

What is the mass calculator for?

The TME mass calculator helps quickly convert values between units used in different measurement systems and various industries. In practice, this means the ability to efficiently convert:

kilograms to pounds and vice versa when working with documentation from manufacturers outside Europe,
micrograms, milligrams, and grams when dosing small amounts of substances in laboratories or production,
tons to kilograms, pounds, or US tons when planning transport and logistics.

Thanks to automatic conversion, you reduce the risk of calculation errors, gain confidence in correct conversions, and save time preparing documentation, offers, or orders.

Most commonly used mass units

The calculator features both metric units and units popular in the American market. The base is the kilogram (kg), and other units can easily be referenced to it. Below is a brief overview:

Micrograms (µg), milligrams (mg), grams (g), decagrams (dag) – units used to describe very small masses, e.g., ingredients of mixtures, pastes, powders, or chemical additives.
Kilograms (kg) – standard in industry, storage, logistics, and technical documentation.
Tons (t) – convenient for describing large loads, masses of equipment, or batches of goods.
Ounces (oz) and pounds (lb) – typical units in the USA and UK markets, often found in manufacturers’ catalogs.
US ton (ST) – unit used in logistics and industry in countries using the imperial system.

The calculator allows quick switching between these units without the need to memorize conversion factors.

Differences between the metric and imperial systems

The metric system, based on grams and kilograms, is the standard in most countries worldwide and in technical documentation compliant with international standards. Units such as microgram, milligram, or ton are simply related through successive multipliers of 10. In the imperial system, used among others in the USA, ounces (oz), pounds (lb), and the US ton (short ton, ST) are used more frequently. It is worth remembering that:

1 pound is not equal to 1 kilogram,
1 US ton (ST) differs from the metric ton (t) – these are distinct units.

When working with English-language documentation, it is easy to make mistakes, especially when the type of ton is not specified. The mass calculator allows quick verification and conversion of values to the familiar metric format.

Practical applications of the calculator

Our mass calculator is useful in many situations related to design, purchasing, and logistics:

when comparing the mass of components provided by different manufacturers in various units,
during transport and storage planning when one part of the documentation uses tons and another pounds,
in laboratories and R&D departments where small amounts of substances are described in mg or µg, and final reports require values in grams or kilograms,
when preparing offers and specifications in which the mass must be converted to units expected by a client or foreign partner.

FAQ – most common questions regarding mass conversion

Can I mix metric and imperial units in the same documentation?

Technically possible, but generally not recommended, as it increases the risk of errors. It is safest to choose one system (metric or imperial) as primary, and if needed, provide values in the second system in parentheses. The mass calculator facilitates such conversions and helps ensure data consistency.

Why are there differences between the calculator’s result and rounding in catalogs?

Manufacturers often round masses to convenient values, e.g., to one decimal place or whole grams. The calculator uses precise conversion factors, so the result may have more decimal figures. In practice, these differences usually do not affect component selection, but in logistical calculations, it is worth deciding how many decimal places to round to.

Is the mass calculator suitable for very small and very large values?

Yes, the calculator handles both very small masses (micrograms and milligrams) and large loads (tons and US tons). For extreme values, it is advisable to pay attention to the output unit – it is often clearer to convert large numbers into tons and very small ones into grams or milligrams rather than dealing with long strings of zeros.

How many grams are in one ounce?

It depends on the type of ounce:

avoirdupois ounce (oz) – most commonly used in trade, technology, and solid body mass; 1oz ≈ 28.35g,
troy ounce (ozt) – used mainly in jewelry (hence the alternative name jeweler’s ounce) and with precious metals; 1ozt ≈ 31.10g,
historically, there was also the apothecaries’ ounce, close in value to the troy ounce, but it is hardly used today.

The TME mass calculator converts units into the standard avoirdupois ounce (oz ≈ 28.35g).

What are historical mass units no longer commonly used?

Mass units from Central Europe

Łut – used among others in old Poland and Germany, usually about 12–13g.
Pound (in the old sense) – depending on the country about 0.4–0.5kg; today in Poland practically replaced by the kilogram, and “pound” is mainly associated with currency.
Cetnar / quintal – large unit of agricultural goods mass; in metric version established at 100kg, but today the kilogram and ton dominate official documents.
Stone – historically used in Poland, still colloquially used in the UK (14 pounds ≈ 6.35kg), but not an SI unit.

Commercial and “commodity” units

Load, bushel, barrel – practically often combined mass with volume (e.g., grain), and their “conversion mass” depended on the type of goods.
Quart, mark, skojec – in various regions of Europe served to measure metals, ores, or colonial goods.

Apothecary and jewelry units

Grain – about 0.0648g, used in pharmacy and measuring gunpowder.
Scruple, dram – apothecary mass units, nowadays mostly only found in historical literature.
Troy ounce (ozt) – about 31.10g; still used with precious metals, but replaced by grams and kilograms in other applications.

Ancient units

Talent – large mass unit (and value) in ancient Greece and the Near East, about 20–30kg depending on the region.
Mina – “sub-unit” of a talent, usually several hundred grams to a few kilograms.
Shekel – smaller unit for measuring silver or gold, roughly 10–15g.

Did you know that...

In everyday language we say “I weigh 70kg,” but the kilogram is a unit of mass, not force. In physics, it would be more correct to say “mass of 70kg,” but… no one will argue about it in a store.
If a feather and a piece of steel have the same mass, they will fall at the same rate in a vacuum. The difference we see on Earth is mainly due to air resistance, not mass.
Over the years, the mass of the prototype kilogram stored in Paris changed slightly (losing atoms from the surface), meaning the kilogram’s definition literally “slimmed down” over time. Today the kilogram is defined by the Planck constant, not a piece of metal in a safe.
The column of air above your body surface (measured up to the upper boundary of the atmosphere) has a mass of… several dozen tons. Fortunately, it presses evenly on everything around you, so you don’t feel it.
A 64GB flash drive weighs about 10–15g. If the same amount of information were stored on paper (as printed text), the mass would run into tens of kilograms.
Your bathroom scale does not actually measure kilograms but the force with which you press on the ground. The device simply assumes standard Earth gravity and converts it to “kg.” If you used the same scale on the Moon, it would show a completely different value – although your mass would be the same.
At the atomic scale, almost all the mass of ordinary matter “resides” in atomic nuclei, that is, protons and neutrons. Electrons are so light that their mass is practically negligible.
In electronics, the mass of a single component is almost insignificant, but if you design a device launched by a rocket, every gram counts – literally. That’s why designers fight for lighter housings, thinner boards, and smaller transformers.
Promotional materials sometimes feature slogans like “ultralight housing” or “super-light power supply.” However, when looking at technical data, it suddenly turns out that “super-light” simply means it weighs 50–100g less than the previous model – but such differences can matter in logistics and assembly.