Calculator Suite

Weight & Mass Converter

Convert between kilograms, pounds, ounces, grams and other mass units

Weight & Mass Converter
Convert between different weight & mass units with precision

Unit to convert from

Unit to convert to

Enter the value you want to convert

150 mg → g

Click "Convert" for detailed results and analysis

Popular Weight & Mass Converter Conversions

150 lb to kg70 kg to lb16 oz to g500 g to oz10 st to kg80 kg to st

Quick Presets

150 lbs to kg500 g to oz
Weight & Mass Converter Formulas
Mass conversions based on the international kilogram standard

Base Unit Method

Vtarget=Vinput×FinputFtargetV_{target} = V_{input} \times \frac{F_{input}}{F_{target}}

VtargetV_{target} = Value in target unit

VinputV_{input} = Value in input unit

FinputF_{input} = Conversion factor to base

FtargetF_{target} = Conversion factor from base

Category-Specific Formula

1 kilogram=2.20462 pounds=35.274 ounces1 \text{ kilogram} = 2.20462 \text{ pounds} = 35.274 \text{ ounces}
Understanding Weight & Mass Converter

Weight vs Mass

Mass is amount of matter (kg), weight is gravitational force (N). Everyday usage often conflates them.

Kilogram Standard

Since 2019, the kg is defined by Planck's constant, not a physical prototype.

Imperial Origins

The pound comes from Roman 'libra' (lb). Stone (14 lbs) is used in UK for body weight.

Cooking/Baking

Professional baking uses weight for consistency. 1 cup flour ≈ 120g but varies!

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Curated video guide
Selected YouTube lessons that add context after the calculator, formulas, examples, assumptions, and limitations.

What Is The Difference Between Mass and Weight?

Source: The Organic Chemistry Tutor on YouTube

Why this video: Selected because it clarifies the common mass-versus-weight confusion behind kilogram, pound, and force-related units.

What it adds: It supplements the converter by explaining why everyday weight conversion often treats mass and weight differently from physics.

Use with this calculator: Use the converter for practical units, then use the video to understand when the distinction matters.

Limits: The video is conceptual and does not cover trade calibration, medical dosing, or jurisdiction-specific measurement rules.

TL;DR — Weight Conversion Essentials

Key conversions: 1 kg = 2.205 lbs, 1 lb = 453.6 g, 1 oz = 28.35 g, 1 stone = 14 lbs = 6.35 kg. Body weight: 150 lbs = 68 kg, 70 kg = 154 lbs.

How to Use This Calculator
1

Select Units

Choose "From" (e.g., Pounds) and "To" (e.g., Kilograms).

2

Enter Weight

Type the mass/weight to convert.

3

View Result

Get the converted weight instantly.

⚖️ Example: Body Weight

165 lbs = 74.8 kg = 11 st 11 lbs

⚠️ Assumptions & Limitations

Assumes:

  • • Avoirdupois pound (not Troy)
  • • Standard Earth gravity
  • • International definitions

Does NOT include:

  • • Troy ounces (gold/silver)
  • • Gravitational variations
  • • Density calculations
Frequently Asked Questions

Kg to Lbs?

1 kg = 2.20462 lbs. Quick: multiply kg by 2.2. To go from lbs to kg, divide by 2.2.

Stones to pounds?

1 stone = 14 lbs = 6.35 kg. Used in UK/Ireland for body weight.

What is the difference between weight and mass?

Mass (kg) = amount of matter. Weight (N) = gravitational force. On Earth, we use them interchangeably.

How many grams in an ounce?

1 oz (avoirdupois) = 28.35 g. For precious metals, 1 troy oz = 31.1 g.

How heavy is 100 lbs in kg?

100 lbs = 45.36 kg.