quick homework checksshopping and product comparisonstravel planningprofessional estimatesDIY and household measurementsgeneral reference
Sources and Accuracy
Length conversions use the metre as the reference unit. Common imperial relationships are exact where standardized, such as 1 inch = 0.0254 metre and 1 foot = 0.3048 metre.
Displayed results are rounded for readability. The calculator keeps enough precision for everyday use and switches to scientific notation for very large or very small values. Last reviewed: 2026-05-21.
About These Units
yard [yd]
Definition
The yard is an imperial and US customary length unit equal to exactly 0.9144 meters.
History
The modern yard was standardized through the international yard and pound agreement.
Current use
Yards are used in fabric measurement, landscaping, sports fields, construction, and household projects.
millimeter [mm]
Definition
The millimeter is a metric length unit equal to one thousandth of a meter.
History
Millimeters come from the decimal metric system and are useful for precise small measurements.
Current use
Millimeters are used in engineering drawings, product dimensions, machining, printing, and medicine.