Unit Converter
Convert between units of length, weight, and temperature. Fast and accurate unit conversion tool.
Last updated: June 2026
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Example: Baking Recipe Conversion 350°F to Celsius
Inputs
Results
What This Means
→ A common baking temperature, 350°F, converts to approximately 176.7°C using the formula: (350 - 32) × 5/9 = 176.7°C.
→ In practice, most ovens set to 180°C (or 175°C on some models), which is close enough. The difference between 176.7°C and 180°C is minimal for baking.
→ Understanding this conversion helps when using recipes from different countries or importing cooking instructions.
→ Remember: Cooking is forgiving for most dishes. Being off by 5–10°C rarely ruins food, unlike chemistry experiments where precision matters.
Our calculators are built using established financial and scientific formulas. Finance tools follow standard amortization and compound interest principles. Health tools use WHO and NIH reference standards.
Last reviewed: June 2026
Learn more about our methodology →About the Unit Converter
Why Unit Conversion Matters
Unit conversions are necessary when recipes use metric measurements but you think in imperial, international travel requires different temperature scales, scientific work uses metric exclusively, or you need to compare measurements across different systems.
The US primarily uses imperial (feet, pounds, Fahrenheit), while most of the world uses metric (meters, kilograms, Celsius). Accurate conversions prevent costly mistakes and confusion.
Common Conversion Types
Length/Distance:
- Inches, feet, yards, miles (imperial)
- Millimeters, centimeters, meters, kilometers (metric)
- 1 inch = 2.54 cm, 1 mile = 1.61 km
Weight/Mass:
- Ounces, pounds, tons (imperial)
- Milligrams, grams, kilograms (metric)
- 1 pound ≈ 453.6 grams, 1 ounce ≈ 28.35 grams
Volume/Capacity:
- Cups, tablespoons, teaspoons, fluid ounces, gallons (imperial)
- Milliliters, liters (metric)
- 1 cup = 236.6 mL, 1 liter ≈ 33.8 fluid ounces
Temperature:
- Fahrenheit (°F) — Used in US
- Celsius (°C) — Used worldwide
- Kelvin (K) — Used in science
- Conversion: °C = (°F - 32) × 5/9
Speed/Velocity:
- Miles per hour (mph)
- Kilometers per hour (km/h)
- Meters per second (m/s)
- 1 mph ≈ 1.61 km/h
Pressure:
- Pounds per square inch (PSI)
- Pascals (Pa), Kilopascals (kPa)
- Atmospheres (atm)
- 1 atm = 101.325 kPa
Metric System Basics
The metric system is based on powers of 10, making conversions elegant:
Prefix meanings:
- Kilo (k) = 1,000× (kilometer = 1,000 meters)
- Centi (c) = 0.01× (centimeter = 0.01 meters)
- Milli (m) = 0.001× (millimeter = 0.001 meters)
- Micro (μ) = 0.000001×
Common Cooking Conversions
Recipes often mix imperial and metric:
- 1 cup = 236.6 mL (often rounded to 240 mL)
- 1 tablespoon = 15 mL
- 1 teaspoon = 5 mL
- 1 ounce = 28.35 grams
- 1 pound = 453.6 grams
Exact vs. Approximate Conversions
Some conversions are exact (defined standards), while others are approximate:
Exact: 1 inch = exactly 2.54 cm (defined internationally)
Approximate: 1 mile ≈ 1.609344 km (but 1.61 km is close enough for most uses)
For everyday use, approximations are fine. For scientific or engineering work, use precise values.
Temperature Conversion
Temperature is unique among conversions—it's not just multiplication:
- °F to °C: (°F - 32) × 5/9
- °C to °F: (°C × 9/5) + 32
Example: 32°F = (32-32) × 5/9 = 0°C ✓
Example: 100°C = (100 × 9/5) + 32 = 212°F ✓
Frequently Asked Questions
For cooking, baking, casual measurements: approximations are fine. For scientific work, engineering, medicine, or legal/regulatory compliance: use exact values. In most everyday life, rounding to convenient numbers is acceptable.
How to Use This Calculator
- 1Select the type of conversion: length, weight, volume, temperature, etc.
- 2Enter the value you want to convert.
- 3Select the unit (e.g., Fahrenheit, pounds, miles).
- 4Select the unit to convert to (e.g., Celsius, kilograms, kilometers).
- 5Click "Convert" to see the result.
- 6Most converters show the conversion formula for learning purposes.