Question 1

How do I convert Celsius to Fahrenheit?

Accepted Answer

To convert Celsius to Fahrenheit, use the formula: °F = (°C × 9/5) + 32. Examples: 0°C = 32°F (freezing point), 20°C = 68°F (room temperature), 37°C = 98.6°F (body temperature), 100°C = 212°F (boiling point). To convert Fahrenheit to Celsius: °C = (°F − 32) × 5/9. The unit converter handles this automatically — just select Temperature as the category.

Question 2

How many kilometers in a mile?

Accepted Answer

1 mile = 1.60934 kilometers (km). Conversely, 1 kilometer = 0.621371 miles. Common conversions: 5 miles = 8.047 km, 10 km = 6.214 miles, 26.2 miles (marathon) = 42.195 km. The UK and USA use miles; most other countries use kilometers. Running races, road distances and speed limits vary between metric and imperial systems.

Question 3

What is the difference between mass and weight?

Accepted Answer

Mass is the amount of matter in an object, measured in kilograms (kg) or pounds (lb) — it stays constant regardless of location. Weight is the force of gravity on that mass, measured in Newtons (N). In everyday use, 'weight' usually means mass (e.g., 'I weigh 70 kg'). For unit conversion purposes, 1 kg = 2.20462 lb. Other common conversions: 1 stone = 6.35 kg = 14 lb, 1 ounce = 28.3495 g, 1 metric ton = 1000 kg = 2204.62 lb.

Question 4

How do I convert square feet to square meters?

Accepted Answer

1 square foot = 0.092903 square meters. To convert sq ft to sq m, multiply by 0.0929. To convert sq m to sq ft, multiply by 10.7639. Common conversions: 100 sq ft = 9.29 sq m, 500 sq ft = 46.45 sq m, 1000 sq ft = 92.9 sq m (a small apartment), 2000 sq ft = 185.8 sq m. Real estate listings in the US and UK use square feet; Europe and most of the world uses square meters.

Category	Units included	Quick reference
Length	mm, cm, m, km, in, ft, yd, mi, nautical mile	1 mile = 1.609 km · 1 foot = 30.48 cm
Mass	mg, g, kg, t, oz, lb, stone, US ton	1 kg = 2.205 lb · 1 stone = 6.35 kg
Temperature	°C (Celsius), °F (Fahrenheit), K (Kelvin)	0°C = 32°F · 100°C = 212°F
Speed	m/s, km/h, mph, knots, ft/s, Mach	100 km/h = 62.14 mph · 1 knot = 1.852 km/h
Area	mm², cm², m², km², in², ft², yd², ac, ha	1 acre = 4047 m² · 1 ha = 2.471 acres
Volume	mL, cL, L, m³, fl oz, cup, pt, qt, US/UK gal, ft³	1 US gal = 3.785 L · 1 UK gal = 4.546 L

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