How to Say Weights in Spanish | Sound Natural, Not Stiff

Spanish weight words click once you match the unit to the number, then use everyday patterns like “pesa” and “de” the way people say them out loud.

You can memorize a list of units and still blank out when you’re reading a gym plan, ordering deli meat, or telling someone your body weight. Spanish has the same building blocks as English—numbers plus units—yet the little connector words change with the situation.

This article gives you the exact words, the common shortcuts, and the small grammar choices that make your Spanish sound relaxed.

How To Say Weights In Spanish With Real-Life Context

Start with the unit. Then add the number. In daily speech, Spanish often uses the short form kilo instead of kilogramo, and it keeps unit symbols the same no matter the number.

You’ll hear three patterns again and again:

• Number + unit (spoken): dos kilos, cien gramos, una libra.
• Number + symbol (written): 2 kg, 100 g, 1 lb.
• Weight + de + item: medio kilo de pollo, trescientos gramos de queso.

Weight Words You’ll Use Most

These are the unit words you’ll see on labels, menus, shipping notes, and workout plans. The metric system is standard in most Spanish-speaking places, yet libra and onza still pop up in daily buying and home cooking in some countries.

Metric Units

Gramo (g) means “gram.” Kilogramo (kg) means “kilogram.” Tonelada (t) is “metric ton.” Smaller units like miligramo (mg) show up in medicine labels and nutrition facts.

Imperial-Style Units You May Hear

Libra (lb) is “pound.” Onza (oz) is “ounce.” Don’t force these unless you hear locals using them, since many places stick to grams and kilos in shops.

Pronunciation That Stops Mix-Ups

Most unit words are straightforward, yet two details save you from getting asked to repeat yourself:

• Kilogramo is usually stressed on -gra-: ki-lo-GRA-mo. In Chile, many people also say ki-LÓ-gra-mo, a regional pattern noted in the Diccionario panhispánico de dudas entry for “kilogramo”.
• Symbols aren’t plural: you write 1 kg and 12 kg, not “kgs.” That fits how measurement symbols work in Spanish writing.

Numbers For Weights: What People Actually Say

For whole numbers, you just say the number. The trick is what you do with halves, quarters, and decimals.

Halves And Quarters

These are the phrases you’ll hear at counters and in kitchens:

• medio kilo = half a kilo (0.5 kg)
• un cuarto de kilo = a quarter kilo (0.25 kg)
• tres cuartos de kilo = three quarters kilo (0.75 kg)

In casual talk, people may shorten further: “Dame medio de jamón” in a deli often means “Give me half a kilo of ham,” with the item understood from the moment.

Decimals

Spoken Spanish often reads decimals with coma in many regions: dos coma cinco kilos (2.5 kg). In writing, you’ll see comma or dot depending on country, and Spanish spelling rules accept both as decimal separators. The RAE guidance on decimal separators lays out those conventions.

If you want a spoken option that stays clear across regions, you can also say the fraction: dos kilos y medio for 2.5 kg.

Common Phrases For Body Weight

When you mean a person’s weight, Spanish leans on the verb pesar (to weigh). You can use it in two easy ways:

• Yo peso 70 kilos. (I weigh 70 kilos.)
• Peso 70 kilos. (Same meaning, more casual.)

To ask, use:

• ¿Cuánto pesas? (How much do you weigh?)
• ¿Cuánto pesa? (Formal “you,” or “How much does it weigh?” for an object.)

For a scale reading, you can say La báscula marca 70 kilos. (The scale reads 70 kilos.)

Package Labels And “Net Weight” Words

Stores and labels add a couple of terms that are worth knowing. If you can read these, you’ll feel calm in any supermarket aisle.

Peso neto means “net weight.” It’s the product without the container. Peso bruto is “gross weight,” more common in shipping or bulk goods.

You may also see contenido neto on food packaging. It’s not a different unit; it’s just another way to label the amount inside.

When you read a label aloud, Spanish usually keeps the unit after the number: “ciento cincuenta gramos”. If you’re pointing at a printed label, you can keep it short: “ciento cincuenta g”.

Gym And Training Talk: Plates, Dumbbells, And Sets

In the gym, you’re talking about “the weights” as objects, not body weight. Spanish often uses pesas for dumbbells or free weights, and discos or placas for plates, depending on the place.

How To Say The Weight Of A Dumbbell

Use the same number + unit pattern:

• Mancuernas de 10 kilos. (10-kilo dumbbells.)
• Una mancuerna de 12,5 kilos. (A 12.5-kilo dumbbell.)

If you’re grabbing a pair, people often say “las de 10” once the unit is clear.

How To Talk About Plates On A Bar

These lines sound natural:

• Pon dos discos de 20. (Put on two 20s.)
• Estoy levantando 80 kilos. (I’m lifting 80 kilos.)
• Sube cinco kilos. (Add five kilos.)

Reps And Sets With Weight

Keep it simple and rhythmic:

• Tres series de ocho con 40 kilos.
• Diez repeticiones con 12 kilos.

Table Of Weight Units, Symbols, And Everyday Use

This table gives you a one-glance map of the units, their symbols, and where you’ll meet them most.

Spanish Unit	Symbol	Where You’ll Hear It
microgramo	µg	Lab reports and nutrition labels
miligramo	mg	Medicine doses and nutrition facts
gramo	g	Groceries, recipes, packaged foods
kilogramo / kilo	kg	Body weight, produce, meat, gym numbers
tonelada	t	Shipping, construction, industry
libra	lb	Markets in places where pounds still stick
onza	oz	Cooking talk and some product labels
arroba	(var.)	Traditional measure in a few rural contexts

Shopping And Cooking: The “De” Pattern

When you buy food by weight, Spanish loves de. You’re ordering a quantity of something.

Use this template:

• [quantity] + [unit] + de + [food]

Then swap in what you need:

• Quisiera 200 gramos de pavo.
• Dame un kilo de arroz.
• Necesito medio kilo de tomates.

If you want to sound like you’ve done this before, add a softener at the front: “Me das…” or “Ponme…”.

Kitchen Notes: When To Use “Un” And When To Drop It

With weights, Spanish often drops the article in casual speech: “Dame 100 gramos” is more common than “Dame unos 100 gramos”. Use unos/unas when you truly mean “a bit under or over,” or when you want to signal flexibility.

Spelling And Unit Standards

If you write recipes, training notes, or labels, stick to standard unit names and symbols. The official definition of the kilogram sits in the International System of Units, and the BIPM SI Brochure appendix on the kilogram is the core reference.

For prefix logic—why 1 kilogram is 1000 grams, and how milli- and micro- work—the NIST overview of SI mass units explains the naming system in clean language.

Pounds To Kilos Without Getting Stuck

If you’re translating a US weight into Spanish, you’ll often want kilos. A handy mental shortcut is:

• 1 lb ≈ 0.45 kg

So 150 lb lands close to 68 kg, and 200 lb lands close to 91 kg. If you need tighter math, use your phone calculator and then say the result naturally: “Peso 68 kilos”. If you want one decimal, say it as a half when it fits, or read the decimal out loud.

Regional Choices: Kilo Vs. Kilogramo, Libra Vs. Kilo

Spanish stays consistent on the core unit words, yet everyday habits shift by country and even by city.

Kilo is the day-to-day pick in most places: “dos kilos de naranjas”. Kilogramo shows up in formal writing, schooling, and technical contexts.

Libra can still be the default in parts of Latin America in markets and home cooking. In those places, you’ll still see metric on packaging and nutrition facts. If you’re traveling, listen first, then mirror what the person across the counter uses.

Table Of Ready-To-Use Weight Phrases

These templates cover the lines you’ll use most in stores, gyms, and everyday chat.

Situation	Spanish Phrase	What It Means
State body weight	Peso 70 kilos.	I weigh 70 kilos.
Ask body weight	¿Cuánto pesas?	How much do you weigh?
Object weight	La maleta pesa 20 kilos.	The suitcase weighs 20 kilos.
Order deli meat	Ponme 200 gramos de jamón.	Give me 200 g of ham.
Buy produce	Dame dos kilos de manzanas.	Give me two kilos of apples.
Half kilo request	Quiero medio kilo de pollo.	I want half a kilo of chicken.
Quarter kilo request	Un cuarto de kilo de queso, por favor.	A quarter kilo of cheese, please.
Dumbbell weight	Mancuernas de 10 kilos.	10-kilo dumbbells.
Add weight	Sube cinco kilos.	Add five kilos.
Total on the bar	Estoy levantando 80 kilos.	I’m lifting 80 kilos.

Common Mistakes That Give You Away

Small slips can make a simple sentence sound odd. Fix these and you’ll feel the difference right away.

Mixing Up “Peso” And “Pesa”

Peso is “I weigh” or “weight” as a noun. Pesa is “it weighs.” So:

• Yo peso 70 kilos. (I weigh 70 kilos.)
• La maleta pesa 20 kilos. (The suitcase weighs 20 kilos.)

Forgetting Agreement On “Libra”

Libra is feminine: una libra, dos libras. Kilo is masculine: un kilo, dos kilos.

Overthinking Plurals With Symbols

When you write kg, g, mg, the symbol stays the same. In speech, you pluralize the word: dos kilos, cien gramos.

A Mini Practice Routine You Can Do Today

If you want this to stick, practice with objects you already handle. It takes five minutes.

1. Pick three items in your kitchen. Read their weights out loud in Spanish.
2. Say your body weight in kilos, then say it again using “y medio” if there’s a half.
3. Make three shopping lines with de: one with grams, one with a kilo, one with a quarter kilo.
4. Say two gym lines: a dumbbell weight and a total bar weight.

Do it again tomorrow with new numbers. After a few rounds, you’ll stop translating in your head.