Convert between kilograms, pounds, ounces, grams, and more
💡 Why This Matters From cooking recipes to shipping labels to gym plates, weight units mix constantly between kilograms and pounds. This tool converts instantly across the units you'll actually run into.
The kilogram used to be defined by a physical platinum-iridium cylinder locked in a vault in France. Since 2019, it's been redefined using a fixed value of Planck's constant instead — no more relying on a single physical object.
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Every unit converts through a common base unit (grams) using fixed, standardized conversion factors. Your input is first converted to grams, then from grams to your target unit — the same two-step approach used across all unit converters on this site, which lets any unit convert cleanly to any other.
The result represents the same physical weight, just expressed in a different unit. Metric units (mg, g, kg, metric ton) scale cleanly by powers of 10. Imperial/US units (ounces, pounds, US tons) use less round conversion factors, which is why converting between the two systems rarely produces a clean whole number.
Results are rounded for display — fine for cooking, shipping estimates, or fitness tracking, but precise scientific, medical, or engineering work should use full-precision factors. This calculator treats "weight" and "mass" interchangeably, as is standard in everyday use, even though they're technically distinct physics concepts.
Use this for converting recipe ingredient weights, checking shipping package weights against carrier limits, comparing gym equipment specs, or reading product weights listed in a different measurement system than you're used to.
Example: Convert 10 kilograms to pounds. One kilogram equals approximately 2.20462 pounds, so 10 × 2.20462 = 22.05 lbs. Selecting Kilograms as your From unit and Pounds as your To unit with a value of 10 gives you that same result directly.
One kilogram equals approximately 2.20462 pounds. This is an exact conversion derived from the internationally defined pound (0.45359237 kg), not a rounded estimate.
Mass measures the amount of matter in an object and stays constant everywhere. Weight measures the force of gravity on that mass and technically changes with location (like on the moon). In everyday use — and in this calculator — the terms are used interchangeably.
One ounce equals approximately 28.3495 grams. This matters for cooking, since many international recipes use grams while US recipes often use ounces or cups.
A metric ton (tonne) is exactly 1,000 kilograms. A US short ton is 2,000 pounds, which works out to about 907 kilograms — noticeably lighter than a metric ton.