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Historical tradition and cutting tables. US and UK fabric stores have cutting tables marked in yards and customers think in yards for projects. Patterns written in yards would need complete conversion. Additionally, common fabric widths (36", 45", 60") align with the yard system. The cost of converting entire industries and re-educating customers maintains the yard system despite official metrication.

Add 10% to meters for yards: 5 meters + 0.5 = 5.5 yards (actual: 5.47). For more precision, multiply by 1.1: 5 × 1.1 = 5.5 yards. Going the other way, multiply yards by 0.9 for meters. Always buy extra fabric when converting because cutting layouts may differ between metric and imperial patterns.

Competition standards differ. FINA (international) only recognizes records in meter pools (25m or 50m). USA Swimming maintains separate records for yard pools (25 yards). Many US pools are 25 yards for historical reasons, while international competitions require meter pools. Times in yard pools are typically faster due to more turns (25 yards = 22.86 meters).

Traditionally yards worldwide, even in metric countries. However, many European and Asian courses now show both. The US and UK exclusively use yards. Professional tours may provide yardage books with both measurements. GPS devices often allow switching between units. The persistence of yards in golf reflects the sport's British/American origins.

Significant challenges arise when metric plans meet imperial materials or vice versa. US lumber comes in feet/inches but might be used with metric plans. Concrete calculations differ: US uses cubic yards, others use cubic meters (1 cubic yard = 0.765 m³). Landscaping materials like mulch, topsoil, and gravel suffer from this divide. Always verify which system suppliers use.