オンライン単位変換ツール
長さ、重さ、温度、面積、体積、速度、データストレージなどの単位を即座に変換。
オンライン単位変換ツール
長さ、重さ、温度、面積、体積、速度、データストレージなどの単位を即座に変換。
Conversion formula
1 m = 3.2808399 ft
1 × 3.2808399 = 3.2808399 ft
Common conversions
All conversions are performed locally in your browser. No data is uploaded to Qudo servers.
What is a Unit Converter?
A unit converter is a tool that allows you to quickly convert values between different measurement units. Whether you need to convert metres to feet, kilograms to pounds, or Celsius to Fahrenheit, a unit converter provides instant and accurate results. Our unit converter supports 13 categories and over 100 units, all computed locally in your browser for maximum speed and privacy.
How to Use the Unit Converter
- Select a conversion category (length, weight, temperature, etc.)
- Choose the source unit from the dropdown
- Enter the value you want to convert
- The result appears instantly in the target unit
- Use the swap button to reverse the conversion direction
- Adjust decimal precision as needed
Metric vs Imperial vs US Systems
The metric system (SI) is used worldwide and is based on powers of 10, making conversions straightforward. The imperial system is primarily used in the United Kingdom for some applications, while the US customary system is used in the United States. Key differences include: 1 US gallon = 3.785 litres while 1 UK (imperial) gallon = 4.546 litres; 1 US fluid ounce = 29.57 mL while 1 UK fluid ounce = 28.41 mL.
US Gallon vs UK (Imperial) Gallon
The US gallon and UK (imperial) gallon are different units. 1 US gallon = 3.785411784 litres, while 1 UK gallon = 4.54609 litres. This means a UK gallon is about 20% larger than a US gallon. The same distinction applies to pints, quarts, and fluid ounces. Our converter clearly labels each as 'US' or 'UK' to avoid confusion.
KB vs KiB: Decimal vs Binary Units
In data storage, KB (kilobyte) = 1,000 bytes (decimal/SI), while KiB (kibibyte) = 1,024 bytes (binary/IEC). Similarly, MB = 1,000,000 bytes but MiB = 1,048,576 bytes. Hard drive manufacturers typically use decimal units, while operating systems often display binary units. Our converter clearly distinguishes between these two systems.
Celsius to Fahrenheit Conversion
The formula to convert Celsius to Fahrenheit is: °F = °C × 9/5 + 32. For example, 0 °C = 32 °F, and 100 °C = 212 °F. Unlike other unit conversions, temperature cannot be converted by simply multiplying by a factor — the offset of 32 must be accounted for. Absolute zero is −273.15 °C = −459.67 °F = 0 K.
Why Can't Mass Be Converted to Volume?
Mass (grams, kilograms) and volume (millilitres, litres) measure fundamentally different physical properties. Converting between them requires knowing the density of the specific substance. For example, 1 gram of water ≈ 1 mL, but 1 gram of flour ≈ 1.7 mL and 1 gram of gold ≈ 0.05 mL. This converter only handles direct unit-to-unit conversions within the same physical quantity.
Conversion Precision
Our converter uses high-precision arithmetic internally and displays results with up to 15 significant digits. For most everyday uses, the default 'Auto' precision provides the most readable result. You can switch to fixed decimal places (2, 4, 6, 8, or 10) when you need more control. Note that JavaScript's floating-point arithmetic may introduce tiny rounding errors for extremely large or small numbers.
Limitations
- Does not support real-time currency exchange rates (requires live API)
- Cannot convert between mass and volume (requires density)
- Mach number is approximate (depends on temperature, altitude, and medium)
- Month and year conversions use fixed averages, not calendar-aware
- Extremely large or small numbers may be displayed in scientific notation
Frequently Asked Questions
Is the conversion done in my browser?
Yes. All calculations are performed locally in your browser. No data is sent to any server.
Are the conversion results accurate?
Yes. We use authoritative conversion factors from NIST and international standards. Results are computed with up to 15 significant digits of precision.
Why are US gallon and UK gallon different?
They are historically different units. 1 US gallon = 3.785 litres, while 1 UK (imperial) gallon = 4.546 litres — about 20% larger.
What is the difference between KB and KiB?
KB (kilobyte) = 1,000 bytes (decimal). KiB (kibibyte) = 1,024 bytes (binary). They are different units and should not be confused.
Why can't I convert grams to millilitres?
Mass and volume are different physical quantities. Converting between them requires knowing the density of the specific substance.
Does it support Celsius, Fahrenheit, and Kelvin?
Yes. Temperature conversions use the correct formulas (not simple multiplication) and support °C, °F, K, and °R.
Can I enter negative numbers or scientific notation?
Yes. The converter supports negative numbers, decimals, and scientific notation (e.g., 1e6 for one million).
Why are results rounded?
In 'Auto' mode, results are shown with an appropriate number of significant digits for readability. You can switch to fixed decimal places for more precision.
Does it work on mobile devices?
Yes. The converter is fully responsive and works on phones, tablets, and desktops.
Is real-time currency conversion supported?
No. Currency conversion requires live exchange rate APIs and is planned as a separate future tool.
Why is the Mach conversion approximate?
The speed of sound varies with temperature, altitude, and medium. We use a standard sea-level approximation (343 m/s at 20 °C in dry air).
Why can't months and years be converted precisely?
Months have varying lengths (28–31 days) and leap years add complexity. Our converter uses fixed averages (1 year = 365 days).
Related Tools
All conversions run entirely in your browser. Your inputs never leave your device.
What is a Unit Converter?
A unit converter is a tool that allows you to quickly convert values between different measurement units. Whether you need to convert metres to feet, kilograms to pounds, or Celsius to Fahrenheit, a unit converter provides instant and accurate results. Our unit converter supports 13 categories and over 100 units, all computed locally in your browser for maximum speed and privacy.
How to Use the Unit Converter
- Select a conversion category (length, weight, temperature, etc.)
- Choose the source unit from the dropdown
- Enter the value you want to convert
- The result appears instantly in the target unit
- Use the swap button to reverse the conversion direction
- Adjust decimal precision as needed
Metric vs Imperial vs US Systems
The metric system (SI) is used worldwide and is based on powers of 10, making conversions straightforward. The imperial system is primarily used in the United Kingdom for some applications, while the US customary system is used in the United States. Key differences include: 1 US gallon = 3.785 litres while 1 UK (imperial) gallon = 4.546 litres; 1 US fluid ounce = 29.57 mL while 1 UK fluid ounce = 28.41 mL.
US Gallon vs UK (Imperial) Gallon
The US gallon and UK (imperial) gallon are different units. 1 US gallon = 3.785411784 litres, while 1 UK gallon = 4.54609 litres. This means a UK gallon is about 20% larger than a US gallon. The same distinction applies to pints, quarts, and fluid ounces. Our converter clearly labels each as 'US' or 'UK' to avoid confusion.
KB vs KiB: Decimal vs Binary Units
In data storage, KB (kilobyte) = 1,000 bytes (decimal/SI), while KiB (kibibyte) = 1,024 bytes (binary/IEC). Similarly, MB = 1,000,000 bytes but MiB = 1,048,576 bytes. Hard drive manufacturers typically use decimal units, while operating systems often display binary units. Our converter clearly distinguishes between these two systems.
Celsius to Fahrenheit Conversion
The formula to convert Celsius to Fahrenheit is: °F = °C × 9/5 + 32. For example, 0 °C = 32 °F, and 100 °C = 212 °F. Unlike other unit conversions, temperature cannot be converted by simply multiplying by a factor — the offset of 32 must be accounted for. Absolute zero is −273.15 °C = −459.67 °F = 0 K.
Why Can't Mass Be Converted to Volume?
Mass (grams, kilograms) and volume (millilitres, litres) measure fundamentally different physical properties. Converting between them requires knowing the density of the specific substance. For example, 1 gram of water ≈ 1 mL, but 1 gram of flour ≈ 1.7 mL and 1 gram of gold ≈ 0.05 mL. This converter only handles direct unit-to-unit conversions within the same physical quantity.
Conversion Precision
Our converter uses high-precision arithmetic internally and displays results with up to 15 significant digits. For most everyday uses, the default 'Auto' precision provides the most readable result. You can switch to fixed decimal places (2, 4, 6, 8, or 10) when you need more control. Note that JavaScript's floating-point arithmetic may introduce tiny rounding errors for extremely large or small numbers.
Your privacy is protected
All conversions are performed locally in your browser. No data is uploaded to Qudo servers.
Limitations
- Does not support real-time currency exchange rates (requires live API)
- Cannot convert between mass and volume (requires density)
- Mach number is approximate (depends on temperature, altitude, and medium)
- Month and year conversions use fixed averages, not calendar-aware
- Extremely large or small numbers may be displayed in scientific notation
Frequently Asked Questions
Is the conversion done in my browser?▼
Are the conversion results accurate?▼
Why are US gallon and UK gallon different?▼
What is the difference between KB and KiB?▼
Why can't I convert grams to millilitres?▼
Does it support Celsius, Fahrenheit, and Kelvin?▼
Can I enter negative numbers or scientific notation?▼
Why are results rounded?▼
Does it work on mobile devices?▼
Is real-time currency conversion supported?▼
Why is the Mach conversion approximate?▼
Why can't months and years be converted precisely?▼
Related Tools
All conversions run entirely in your browser. Your inputs never leave your device.