kilo

The word kilo (often spelled quilo in formal Portuguese, though 'k' is increasingly common in informal and commercial contexts) is a fundamental unit of mass in the International System of Units (SI). In the Portuguese-speaking world, particularly in Brazil and Portugal, the metric system is the absolute standard. Understanding 'kilo' is not just about a mathematical measurement; it is a gateway to daily life, from grocery shopping to discussing personal health. When a Portuguese speaker says 'um kilo', they are referring to 1,000 grams. This word is a shortened version of quilograma. In everyday speech, the full word is rarely used unless the context is scientific, legal, or extremely formal. For a learner, mastering 'kilo' involves understanding its gender—it is masculine (o kilo)—and its plural form (os kilos).

Grammatical Gender

Masculine (O kilo, um kilo).

Historically, the 'k' was not part of the official Portuguese alphabet until the 1990 Orthographic Agreement, which fully integrated K, W, and Y. Therefore, you will see 'quilo' in older books and 'kilo' or 'kg' in modern supermarkets. The concept of the 'kilo' is deeply embedded in the culinary culture. In Brazil, the 'restaurante por quilo' (pay-by-weight restaurant) is a cultural phenomenon where customers serve themselves from a buffet and pay based on the weight of their plate. This makes 'kilo' one of the most frequently uttered words during lunch hours in Brazilian cities. Furthermore, when discussing body weight, Portuguese speakers use 'kilos' where English speakers might use 'pounds'. If someone says 'Eu perdi cinco kilos', they are describing a significant weight loss of about 11 pounds.

Common Abbreviation

kg (Standardized globally).

The versatility of the word extends to metaphorical uses, though less common than in English. However, its primary function remains the measurement of solid goods. When you go to a 'feira' (open-air market), you will hear vendors shouting prices 'por kilo'. It is essential to note that in Portuguese, the decimal separator is a comma, not a period. So, 1,5 kg is 'um kilo e meio'. This linguistic nuance is vital for transactions. The word also appears in technical terms like 'kilometragem' (mileage) or 'kilowatt', though 'kilo' on its own always implies mass. The social importance of the kilo in Portuguese-speaking countries cannot be overstated, as it dictates the economy of the kitchen and the health of the individual.

Plural Form

Kilos (e.g., dois kilos, dez kilos).

Using the word kilo correctly in Portuguese requires an understanding of both grammar and social context. Primarily, 'kilo' acts as a noun of measurement. In a sentence, it usually follows a number and precedes the preposition 'de' (of) and the substance being weighed. For example, 'dois kilos de laranjas' (two kilos of oranges). Unlike English, where 'kilo' might sound slightly technical compared to 'pounds', in Portuguese, it is the only way to talk about weight. You will use it at the gym, at the doctor, at the airport, and most frequently, at the supermarket. One of the most important phrases for a traveler is 'Me dá um kilo de...', which means 'Give me a kilo of...'.

Sentence Structure

[Number] + kilo(s) + de + [Noun].

In Brazil, the 'Restaurante por Quilo' is a staple of urban life. When you enter, you might hear 'É no quilo?' (Is it by weight?). Here, 'quilo' refers to the pricing system. You weigh your plate on a scale (balança), and the price is calculated per gram, but the reference rate is always the 'preço do quilo'. If you are watching your weight, you might say 'Eu quero perder alguns kilos' (I want to lose a few kilos). Note that 'kilo' is never used for liquid volume; for that, you use 'litro'. However, for things like flour, sugar, and even ice, 'kilo' is the standard. Another common usage is 'meio kilo' (half a kilo), which is 500 grams. You will rarely hear 'quinhentas gramas' in a casual setting; 'meio kilo' is much more natural.

Fractions

Meio kilo (500g), um kilo e meio (1.5kg), um quarto de kilo (250g).

In formal writing, such as a thesis or a legal document, you should use the spelling quilograma. However, in emails, text messages, and advertising, kilo or kg is perfectly acceptable. When talking about the weight of a person, the question is 'Quantos kilos você pesa?' (How many kilos do you weigh?). The answer would be 'Eu peso setenta kilos'. It is considered polite to use 'kilos' rather than 'peso' in some contexts to sound less clinical. In sports, especially combat sports like MMA or Brazilian Jiu-Jitsu, weight classes are always defined by 'kilos'. A fighter might say 'Eu preciso bater o peso de oitenta kilos'. This cultural ubiquity makes 'kilo' a high-frequency word that learners must feel comfortable using in various syntactic positions.

Commercial Usage

Preço por kilo (Price per kilo).

The word kilo is ubiquitous in the Lusophone world. You will hear it most prominently in marketplaces, supermarkets, and kitchens. In a Brazilian 'feira', the atmosphere is loud and rhythmic, with vendors shouting 'Olha o kilo do tomate, apenas cinco reais!'. Here, 'kilo' is the unit of currency as much as it is a unit of mass. In Portugal, at a 'mercado municipal', the interaction might be more subdued, but the word remains the central pillar of the transaction. You will also hear it in every household during meal preparation. A mother might tell her child, 'Vá à padaria e compre um kilo de pão'. This everyday usage makes it one of the first words a child learns related to numbers and quantities.

Market Setting

Vendors shouting prices per kilo.

Beyond the market, 'kilo' is a constant in the fitness and health world. Brazil, in particular, has a very health-conscious urban culture. In gyms from Rio de Janeiro to Luanda, people discuss their progress in 'kilos'. 'Hoje eu levantei dez kilos a mais no supino' (Today I lifted ten more kilos on the bench press). In clinical settings, a nurse will ask you to step on the scale and then announce your weight: 'Oitenta e dois kilos'. This usage is so common that 'kilo' becomes synonymous with 'weight' itself in many casual conversations. You might hear someone say 'Estou com uns kilos a mais' (I have a few extra kilos), meaning they feel they have gained weight.

Fitness Context

Discussing weights in the gym or body weight.

In the travel industry, 'kilo' is a word of anxiety. At airport check-in counters, the phrase 'excesso de bagagem' is usually followed by a number of 'kilos'. A traveler might plead, 'Mas são só dois kilos a mais!' (But it's only two extra kilos!). The word is also heard in logistics and shipping. If you are sending a package via 'Correios' (the Brazilian postal service), the first thing they do is put the box on a scale and tell you the weight in kilos. In news reports about agriculture or the economy, 'kilo' is used to discuss the price of commodities like soy, coffee, or beef. 'O preço do kilo da carne bovina subiu 10%'. This range of contexts—from the intimate kitchen to the global economy—demonstrates the word's essential nature.

Logistics

Shipping and baggage weight.

One of the most frequent mistakes learners make with the word kilo is regarding its grammatical gender. Many learners assume that because 'grama' (when referring to grass) is feminine (a grama), the unit of mass must also be feminine. This is incorrect. The unit of mass 'grama' is masculine (o grama), and therefore 'kilo' (the short form of quilograma) is also masculine. You should always say 'um kilo', 'dois kilos', 'o kilo'. Saying 'uma kilo' is a major red flag that identifies a non-native speaker. This error often carries over into fractions, where students might say 'uma kilo e meia' instead of the correct 'um kilo e meio'.

Gender Error

Incorrect: 'Uma kilo'. Correct: 'Um kilo'.

Another common pitfall is the spelling. While 'kilo' is widely used in commercial signs and informal writing, the traditional Portuguese spelling is 'quilo'. In Portugal, 'quilo' is much more strictly enforced in formal education and media. In Brazil, the letter 'k' was officially added to the alphabet in 1990, but 'quilo' remains the 'standard' academic spelling. Learners often get confused about which one to use. The rule of thumb is: use 'kg' for notes, 'kilo' for casual texts/signs, and 'quilo' or 'quilograma' for formal essays. Additionally, learners from the US or UK often try to convert weights to pounds (libras) when speaking. In Portuguese-speaking countries, 'libra' is almost never used for weight unless referring to the British currency. Using 'libras' for weight will likely result in confusion.

Spelling Confusion

Kilo (Modern/Informal) vs. Quilo (Traditional/Formal).

The third major mistake involves the use of the preposition 'de'. Learners often forget to include 'de' between 'kilo' and the noun. In English, we say 'a kilo of sugar', but in fast speech, the 'of' is sometimes swallowed. In Portuguese, 'um kilo açúcar' is grammatically incomplete and sounds very jarring. It must always be 'um kilo DE açúcar'. Similarly, when using 'meio' (half), remember that 'meio' agrees with 'kilo' (masculine), not the substance. So, even if you are buying 'maçãs' (feminine), you say 'meio kilo de maçãs', because you are referring to half of a kilo. These small grammatical agreements are where most learners trip up, but they are essential for reaching a B1 or B2 level of fluency.

Agreement

Meio kilo (Correct) vs. Meia kilo (Incorrect).

When discussing kilo, it is helpful to understand its relationship with other units of measurement in Portuguese. The most direct relative is the grama. One kilo equals one thousand grams. In shopping contexts, you will often switch between 'kilo' and 'gramas'. For example, if you need less than half a kilo, you would say 'trezentas gramas' (300g). Another related term is tonelada (metric ton), which is 1,000 kilos. This is used in industrial and agricultural contexts. In Brazil, you might also hear the term arroba (@), which is a traditional unit used specifically for weighing cattle and some agricultural products, equivalent to approximately 15 kilos.

Kilo vs. Grama

Kilo is for larger quantities; grama is for smaller, precise amounts.

Another word often confused with 'kilo' by beginners is quilômetro (kilometer). While both share the prefix 'kilo-' (meaning thousand), they measure entirely different things. A 'quilômetro' measures distance, while a 'kilo' (quilograma) measures mass. In casual speech, 'quilômetro' is often shortened to 'km', while 'quilograma' is shortened to 'kilo'. It's important not to shorten 'quilômetro' to 'kilo'. If you say 'Eu corri cinco kilos', people will think you ran while carrying five kilos, not that you ran five kilometers. For distance, always use the full word or 'km'. Another similar-sounding word is quilo (chyle), a biological term for digestive fluid, but this is extremely rare in daily conversation.

Kilo vs. Quilômetro

Kilo = Mass (Weight). Quilômetro = Distance.

In the context of weighing things, you might also encounter peso (weight) and massa (mass). While scientifically different, in daily Portuguese, 'peso' is used as a synonym for the value in kilos. 'Qual é o seu peso?' is the same as 'Quantos kilos você tem?'. There is also the word balança (scale), which is the tool used to measure kilos. If you are at a market and can't find the weight, you might ask 'Onde está a balança para pesar este kilo de uvas?'. Understanding these related terms helps build a semantic web around 'kilo', making it easier to remember and use in real-world scenarios where you won't just be saying the word in isolation.

Related Tools

Balança (Scale), Pesagem (Weighing).