What Is a Pound?
A pound equals 16 ounces or about 453.6 grams. Learn how heavy a pound is, where it came from, and common pound conversions.
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67 in-depth guides covering real object sizes, unit conversions, and measurement reference — not just calculators.
What Is a Kilogram?
A kilogram is 1,000 grams, about 2.2 pounds. Learn the kilogram's history, the 2019 redefinition, and common kg conversions.
What Is a Gram?
A gram is 1/1000 of a kilogram, about 0.035 oz. Learn how heavy a gram is, where it's used, and common gram conversions.
Metric vs. Imperial: What’s the Difference?
Metric vs imperial: how the two systems differ, why the US still uses imperial units, and a quick conversion cheat sheet for length, weight and volume.
What Is a Kilometer?
A kilometer is 1,000 meters, about 0.62 miles. Learn how big a km is, why most of the world uses it, and common kilometer conversions.
What Is a Foot?
A foot equals 12 inches or 30.48 cm. Learn how big a foot is, its history, why aviation still uses it, and common foot conversions.
What Is an Inch?
An inch is exactly 2.54 cm, or 1/12 of a foot. Learn how big an inch is, where it came from, and how it converts to cm, feet and yards.
How Big Is 3 Meters? Everyday Things That Size
3 meters is about 9.84 feet. See everyday objects that are around 3 m and how to picture the size without a tape measure.
2 Yards to Inches: Quick & Easy Conversion
2 yards equals 72 inches (6 feet). See the yard to inch formula, a reference table, and quick mental math for yard conversions.
1 Yard to Inches: Quick & Easy Conversion
1 yard equals 36 inches. See the yard to inch formula, a reference table, quick mental math and where the yard is still used today.
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