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Aviation standardized on feet for altitude in the 1920s when the US and UK dominated aviation. Despite metrication elsewhere, changing would require re-calibrating every altimeter and retraining every pilot worldwide, so feet remains the standard except in Russia, China, and a few other countries.

Both can be equally accurate. Meters allow easier calculation with decimal places, while feet and inches can express common fractions (like 1/8") that are frequently used in construction. The key is consistency within a project.

Multiply meters by 3 and add 10% for a close approximation. For example: 10m × 3 = 30, plus 10% (3) = 33 feet. The actual conversion is 32.8 feet, so you're within 1%.

The International Association of Athletics Federations (now World Athletics) standardized track distances in meters in the early 1900s. For international competition consistency, even US tracks are built to metric specifications.

The US survey foot (used in land surveying until 2022) was 0.30480061m, while the international foot is exactly 0.3048m. The difference is tiny (2 parts per million) but matters for large-scale mapping. The US fully adopted the international foot in 2023.