FAQ
FREQUENTLY ASKED QUESTIONS (FAQ)
Find answers to the most common questions about unit conversion.
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GENERAL QUESTIONS
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Q: What is a unit converter and why do I need one?
A: A unit converter transforms measurements from one unit system to another (e.g., inches to centimeters or pounds to kilograms). You need one when following international recipes, traveling abroad, shopping from international retailers, or working on projects requiring precise measurements in different units.
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Q: How accurate are online unit converters?
A: ExactUnitConverter provides highly accurate conversions using standard international conversion factors. Our converters are accurate to multiple decimal places, suitable for everyday use, professional work, and scientific calculations.
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LENGTH CONVERSIONS
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Q: How many inches are in a centimeter?
A: 1 centimeter equals 0.394 inches. Conversely, 1 inch equals 2.54 centimeters exactly.
Quick tip: To convert cm to inches, divide by 2.54. To convert inches to cm, multiply by 2.54.
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Q: How do I convert feet to meters?
A: Multiply feet by 0.3048. One foot equals exactly 0.3048 meters.
Common conversions:
• 5 feet = 1.524 meters
• 6 feet = 1.829 meters
• 10 feet = 3.048 meters
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Q: How do I convert kilometers to miles?
A: Multiply kilometers by 0.621. For quick mental math, multiply by 0.6.
Quick reference:
• 5 km = 3.1 miles
• 10 km = 6.2 miles
• 100 km = 62 miles
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WEIGHT CONVERSIONS
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Q: How do I convert pounds to kilograms?
A: Divide pounds by 2.2 or multiply by 0.454.
Common conversions:
• 100 lbs = 45.4 kg
• 150 lbs = 68.0 kg
• 200 lbs = 90.7 kg
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Q: How many grams are in an ounce?
A: One ounce equals 28.35 grams.
Common kitchen conversions:
• 1 oz = 28 grams
• 4 oz = 113 grams
• 8 oz = 227 grams
• 16 oz = 454 grams
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TEMPERATURE CONVERSIONS
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Q: How do I convert Celsius to Fahrenheit?
A: Formula: °F = (°C × 9/5) + 32
Quick method: Double the Celsius, subtract 10%, then add 32.
Common temperatures:
• 0°C = 32°F (freezing)
• 20°C = 68°F (room temp)
• 37°C = 98.6°F (body temp)
• 100°C = 212°F (boiling)
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Q: How do I convert Fahrenheit to Celsius?
A: Formula: °C = (°F – 32) × 5/9
Example: 77°F = (77-32) × 5/9 = 25°C
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Q: What is room temperature?
A: Room temperature is 20-22°C (68-72°F) for living spaces. Bedrooms are cooler at 16-19°C (60-66°F) for better sleep.
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VOLUME CONVERSIONS
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Q: How many liters are in a gallon?
A: US Gallon: 1 gallon = 3.79 liters
UK Gallon: 1 gallon = 4.55 liters
The UK gallon is about 20% larger than the US gallon.
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Q: How many cups are in a liter?
A: US Cup: 1 liter = 4.2 cups (1 cup = 237 ml)
Metric Cup: 1 liter = 4 cups (1 cup = 250 ml)
For cooking with US cups, approximately 4 cups equals 1 liter.
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AREA CONVERSIONS
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Q: How do I convert square feet to square meters?
A: Multiply square feet by 0.093.
Common conversions:
• 100 ft² = 9.3 m²
• 500 ft² = 46.5 m²
• 1,000 ft² = 93 m²
• 2,000 ft² = 186 m²
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Q: How many square feet are in an acre?
A: 1 acre = 43,560 square feet = 4,047 square meters
An acre is roughly the size of an American football field without the end zones.
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SPEED CONVERSIONS
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Q: How do I convert mph to km/h?
A: Multiply mph by 1.6.
Common speed limits:
• 25 mph = 40 km/h
• 55 mph = 89 km/h
• 65 mph = 105 km/h
• 70 mph = 113 km/h
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Q: How fast is a knot?
A: 1 knot = 1.15 mph = 1.85 km/h
Knots are used in aviation and marine navigation worldwide.
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POPULAR QUESTIONS
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Q: How tall is 6 feet in centimeters?
A: 6 feet = 183 centimeters
Common heights:
• 5’0″ = 152 cm
• 5’6″ = 168 cm
• 6’0″ = 183 cm
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Q: How many miles is a 5K run?
A: A 5K equals 3.1 miles.
Common race distances:
• 5K = 3.1 miles
• 10K = 6.2 miles
• Half Marathon = 13.1 miles
• Marathon = 26.2 miles
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Q: What is 100 degrees Fahrenheit in Celsius?
A: 100°F = 37.8°C (approximately 38°C)
This is slightly above normal body temperature and considered a low-grade fever.
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