The conversion method (one unit to rule them all)

A reliable way to convert between many weight units is to pick a single “reference” unit, convert everything into that reference, then convert into the target unit. This Weight Converter uses kilograms (kg) as the reference unit. That keeps the math consistent and prevents “chain rounding” errors (where tiny rounding mistakes get amplified as you hop unit-to-unit).

The process is always:

• Step 1: Convert your input value to kilograms: kg = value × factorToKg.
• Step 2: Convert kilograms to the target unit: target = kg ÷ factorToKg(target).
• Step 3: Round the display using your selected rounding setting (the underlying math stays high precision).

• It’s the SI base unit for mass, so most scientific and engineering conversions anchor to it.
• It avoids ambiguity: “ton” can mean different things, but kg is always kg.
• It’s numerically stable: fewer huge numbers than using mg, fewer tiny decimals than using tons.

• 1 lb = 0.45359237 kg (exact by definition)
• 1 oz = 1/16 lb = 0.028349523125 kg
• 1 st = 14 lb = 6.35029318 kg
• 1 metric ton (t) = 1000 kg
• 1 US short ton = 2000 lb = 907.18474 kg
• 1 UK long ton = 2240 lb = 1016.0469088 kg

Notice a theme: once you know how each unit relates to kilograms, converting between any two units becomes a simple multiply then divide. That’s the same approach you’d use in a spreadsheet, a physics homework solution, or a shipping rate calculator — just packaged here in a fast, shareable interface.

Real-world conversion examples

Examples make the formulas feel obvious. Below are a few “most searched” conversions that people screenshot and share (especially around fitness and cooking).

• We use: lb = kg ÷ 0.45359237
• So: 72.5 ÷ 0.45359237 ≈ 159.83 lb

• 1 oz = 28.349523125 g
• So: 8 × 28.349523125 ≈ 226.80 g

• 1 st = 6.35029318 kg
• So: 3 × 6.35029318 ≈ 19.05 kg

• 1 t = 1000 kg
• lb = 1000 ÷ 0.45359237 ≈ 2204.62 lb

Pro habit: If you frequently convert a certain number (like a standard plate set or a common recipe size), click Save and keep it in your local “recent conversions” list for quick reuse.

Conversion formulas (the short version)

You can treat conversions like “unit ratios.” A ratio tells you how many kilograms are in one unit. If your unit is bigger than a kilogram (like a ton), your ratio is large. If your unit is smaller than a kilogram (like a gram), your ratio is small.

• To convert from Unit A to Unit B:
• Step 1: kg = value × factorToKg(A)
• Step 2: valueInB = kg ÷ factorToKg(B)

• kg → lb: lb = kg × 2.2046226218
• lb → kg: kg = lb × 0.45359237
• oz → g: g = oz × 28.349523125
• g → oz: oz = g ÷ 28.349523125
• st → lb: lb = st × 14
• lb → oz: oz = lb × 16

The converter automatically chooses the appropriate formula by converting through kilograms. That means you can convert weird combos like milligrams to UK long tons (yes, it works), and you’ll still get a correct answer.

In everyday language, “weight” is what people mean when they say “I weigh 170 pounds” or “the package weighs 2 kg.” Technically, pounds and kilograms are mass units; weight is a force (newtons). For normal conversions in daily life, treating them as mass units is exactly what you want. This calculator is a standard mass/weight unit converter used in fitness, cooking, travel, and shipping.

Frequently Asked Questions

• Is this Weight Converter accurate?

  Yes for everyday and professional-use conversions. It uses standard unit definitions (for example, 1 pound is defined as exactly 0.45359237 kilograms). The tool performs high-precision math internally, then rounds only the display number based on your “Rounding” choice.

• Why do you have three “ton” options?

  Because “ton” is a word with multiple definitions. A metric ton is 1000 kg. A US short ton is 2000 lb (≈ 907.18474 kg). A UK long ton is 2240 lb (≈ 1016.0469088 kg). If you’re doing shipping or engineering work, choose the ton type that matches your context.

• What’s the fastest way to convert kg to lb?

  Multiply by 2.2046226218. For a quick mental estimate, multiply by 2.2. Example: 80 kg ≈ 176 lb (exact is ~176.37 lb).

• Why do my results change when I change rounding?

  The underlying conversion doesn’t change — only how many decimal places are shown. For cooking, 0–2 decimals is usually enough. For lab/engineering work, try 4–6 decimals.

• Can I convert “body weight” and “weight plates” with the same tool?

  Yes. A kilogram is a kilogram, whether it’s a person’s weight, a dumbbell plate, or a shipment. Just enter the number and pick the units you want.

• Does this store my data?

  No server storage. If you click “Save,” the conversion is stored locally in your browser’s storage on this device (similar to how many calculators store recent history). You can clear it anytime.

Explore more calculators

If you’re working with datasets, measurements, or health goals, these tools pair perfectly with weight conversions.

How to use this converter for shareable content

Weight conversions are surprisingly viral because they show up in hot topics: fitness transformations, travel packing hacks, “what does this recipe mean in grams,” and shipping cost comparisons. If you run a blog, fitness page, cooking channel, or an ecommerce store, you can use this page as a quick “conversion proof” people can screenshot and share.

• Fitness posts: “My cut started at 92 kg — that’s 202.83 lb.” Screenshot and share.
• Recipe posts: “8 oz of flour is 226.80 g.” Add the screenshot to your recipe card.
• Travel hacks: “23 kg baggage limit is 50.71 lb.” Great for story posts.
• Shipping: “15 lb package is 6.80 kg.” Add to product listing FAQs.

One last tip: if you want the cleanest screenshot, set rounding to 2 decimals, convert, then use the Copy button. The text is formatted to look good in group chats and captions.

Popular conversions at a glance

Here are a few quick references. (Your exact values may differ slightly depending on rounding settings.)