🔄 Unit Converters — Free Online Calculators & Tools

1 metre = 3.28084 feet (exactly: 1 foot = 0.3048 metres). To convert: metres × 3.28084 = feet. For heights: 1.8m = 5 ft 10.9 in. Quick estimate: multiply metres by 3.3 (slightly high but easy mental math).

°F = (°C × 9/5) + 32. Quick trick: double the Celsius, subtract 10%, add 32. Example: 30°C → 60 – 6 = 54 + 32 = 86°F. Key reference points: 0°C = 32°F (water freezes), 100°C = 212°F (water boils), 37°C = 98.6°F (body temperature), -40°C = -40°F (the only equal point).

1 pound = 0.453592 kg. 1 kg = 2.20462 pounds. Quick estimate: multiply kg by 2.2 to get pounds. Example: 70 kg = 70 × 2.2 = 154 lbs. To convert back: lbs ÷ 2.2 = kg.

1 square metre = 10.7639 square feet. 1 square foot = 0.0929 square metres. Common in Indian real estate: 1,000 sq ft apartment = 92.9 m². Plot sizes: 30×40 ft = 1,200 sq ft = 111.5 m².

1 knot = 1 nautical mile per hour = 1.852 km/h. Knots are used in aviation and maritime. A commercial aircraft cruises at ~900 km/h = 486 knots. Wind speeds in weather: 1 knot ≈ 1.85 km/h. Hurricane force wind: 65+ knots = 120+ km/h.