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The US began metrication in the 1970s but halted due to public resistance and cost. Industries had invested heavily in imperial tooling, and the public found metric unfamiliar. Today, the cost of full conversion is estimated at hundreds of billions of dollars, though many US industries quietly use metric internally.

It depends on the application. For casual use, 0.3 meters per foot is adequate. For construction, use 0.3048. For precision engineering or legal documents, use all decimal places (0.3048 exactly). GPS and surveying may require even more precision.

Divide feet by 3.3 for a quick approximation (about 1% error). For better accuracy, divide by 3, then subtract 2%. Example: 100 feet ÷ 3 = 33.33, minus 2% ≈ 32.7 meters (actual: 30.48m).

Pilots worldwide use feet for altitude (except in Russia, China, and a few other countries). However, visibility is reported in meters in most countries, and runway lengths may be in either unit. This mixed system requires pilots to be fluent in both.

Historical convention. Feet work well for human-scale measurements (rooms, height), while acres better express large land areas. One acre equals 43,560 square feet - an unwieldy number that shows why different units evolved for different scales.