Unit Converter
Convert length, weight, temperature, area, volume, speed, pressure, energy, power, time, and data units with accurate steps and reference tables.
Convert Metric, Imperial, US customary, international, and digital units.
Conversion inputs
Conversion result
Calculation breakdown
- Start with 1 m.
- Use the m-to-ft multiplier 3.281.
- Multiply 1 by 3.281.
- The converted value is 3.281 ft.
See both units move together
Move the slider to explore the same conversion relationship at different values.
| Scale | Meter | Foot |
|---|---|---|
| 25% | 0.25 m | 0.82 ft |
| 50% | 0.5 m | 1.64 ft |
| 100% | 1 m | 3.281 ft |
| 200% | 2 m | 6.562 ft |
| 500% | 5 m | 16.404 ft |
All length equivalents
The entered quantity expressed in every supported unit in this category.
| Unit | Symbol | Equivalent value |
|---|---|---|
| Millimeter | mm | 1,000 |
| Centimeter | cm | 100 |
| Meter | m | 1 |
| Kilometer | km | 0.001 |
| Inch | in | 39.37 |
| Foot | ft | 3.281 |
| Yard | yd | 1.094 |
| Mile | mi | 0.001 |
| Nautical mile | nmi | 0.001 |
US customary and UK Imperial volume units are labeled separately. Results are displayed to 2-3 decimal places.
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What does the Unit Converter calculate?
The Unit Converter converts the values you enter into a structured estimate using the formulas and assumptions documented on this page. Use the result to compare scenarios, review the calculation details, and identify sensitive inputs. Check the guide and formula sections before using the estimate for an important decision.
Unit Converter at a Glance
- Converts length, mass, temperature, area, volume, speed, pressure, energy, power, time, and digital storage.
- Supports Metric, US customary, UK Imperial, and decimal or binary data units.
- Provides searchable unit selectors, reverse relationships, and an all-unit reference table.
- Uses offsets for temperature and rejects temperatures below absolute zero.
- Handles extreme magnitudes and displays results to two or three decimal places.
A Short History of Measurement Units
Measurement systems developed locally for trade, construction, science, and navigation. The metric system introduced a decimal structure, while international agreements later standardized definitions such as the meter and kilogram. US customary and UK Imperial units retain several familiar names but are not always equal.
What Does This Unit Converter Do?
This converter changes compatible measurements across eleven categories. Select the quantity first so only units measuring the same dimension can be compared, then choose searchable source and destination units. Review the Unit Converter assumptions before relying on this result for decisions.
Who Should Use It?
Students, travelers, cooks, builders, engineers, scientists, programmers, and shoppers can use it to translate measurements while keeping systems and unit definitions explicit. For a useful Unit Converter result, use realistic inputs, compare relevant scenarios, and review the stated assumptions before making a decision.
What Problems Does It Solve?
For “What Problems Does It Solve?,” the Unit Converter organizes the relevant inputs, applies the documented method, and shows a result that can be compared across scenarios. The points below identify the specific considerations and assumptions users should review before relying on the estimate.
- Converts Metric values to US customary or Imperial units and back.
- Distinguishes US and UK capacity units with similar names.
- Handles temperature scale factors and zero-point offsets.
- Separates decimal storage units from binary storage units.
- Shows compact results without hiding very large or small values.
Key Benefits
- Searchable: find units by name, symbol, or abbreviation.
- Category-safe: incompatible dimensions cannot be selected together.
- Transparent: the applied relationship and base-unit step are visible.
- Reversible: reciprocal conversions provide a quick check.
- Responsive: long unit names and extreme values remain readable.
Metric, US Customary, and Imperial Systems
Metric prefixes such as milli, centi, kilo, and mega follow powers of ten. US customary and UK Imperial units share some names, but fluid ounces, pints, and gallons differ, so the converter labels them separately.
Unit Conversion Definitions
- Quantity
- The kind of measurement, such as length, mass, or temperature.
- Source unit
- The unit attached to the entered value.
- Destination unit
- The unit requested for the result.
- Scale factor
- The multiplier relating a unit to the category base unit.
- Offset
- A zero-point adjustment used by affine scales such as temperature.
- Precision
- The number of decimal places shown, not additional measurement accuracy.
When Should You Use This Converter?
Use it for product dimensions, shipping weights, recipes, travel speeds, pressure readings, energy comparisons, screen dimensions, construction quantities, time values, and digital storage. For a useful Unit Converter result, use realistic inputs, compare relevant scenarios, and review the stated assumptions before making a decision.
How the Conversion Works
For “How the Conversion Works,” the Unit Converter organizes the relevant inputs, applies the documented method, and shows a result that can be compared across scenarios. The points below identify the specific considerations and assumptions users should review before relying on the estimate.
- Select the measurement category.
- Enter the source value.
- Choose searchable source and destination units.
- Convert the source value to the category base unit.
- Convert the base value to the destination unit.
- Round the displayed result only at the end.
Review the conversion formulas or follow the worked examples.
Special Conversion Cases
Temperature
Temperature uses a scale and an offset because Celsius, Fahrenheit, Kelvin, and Rankine do not share a zero point.
Digital storage
Decimal prefixes use powers of 1,000, while binary prefixes use powers of 1,024. One GB and one GiB are therefore different quantities.
Common Unit Conversion Mistakes
- Mixing area units with length units.
- Using a US gallon when an Imperial gallon is intended.
- Treating mass and force as interchangeable.
- Confusing decimal MB and GB with binary MiB and GiB.
- Rounding a conversion factor before finishing the calculation.
- Assuming extra displayed digits make the source measurement more accurate.
Frequently Asked Questions
How does a unit converter work?
For units that share a dimension, the calculator converts the entered value to a category base unit and then converts that base value to the selected output unit. Review the Unit Converter assumptions before relying on this result for decisions.
How do I convert Metric units to Imperial units?
Choose a category, select the Metric source unit and the Imperial or US customary destination unit, then enter the measurement. The calculator applies the stored conversion factors in both directions. Review the Unit Converter assumptions before relying on this result for decisions.
Why are temperature conversions different?
Temperature scales do not share a common zero. Celsius, Fahrenheit, Kelvin, and Rankine therefore require both a scale factor and an offset. For a useful Unit Converter result, use realistic inputs, compare relevant scenarios, and review the stated assumptions before making a decision.
Are US and UK gallons the same?
No. A US gallon equals 3.785411784 liters, while a UK imperial gallon equals 4.54609 liters. The converter labels these units separately. For a useful Unit Converter result, use realistic inputs, compare relevant scenarios, and review the stated assumptions before making a decision.
What is the difference between MB and MiB?
A decimal megabyte is 1,000,000 bytes. A binary mebibyte is 1,048,576 bytes. The calculator keeps decimal and binary storage units distinct. For a useful Unit Converter result, use realistic inputs, compare relevant scenarios, and review the stated assumptions before making a decision.
Why does the displayed result have two or three decimal places?
The calculator uses additional Decimal.js precision internally, then rounds only the displayed value to the precision you select. For a useful Unit Converter result, enter realistic values, compare relevant scenarios, check the calculation details, and review the definitions, assumptions, and limitations before using the estimate for an important decision.
Can I convert negative values?
Signed values are valid for many mathematical conversions. Temperature is the exception: inputs below absolute zero are rejected. For a useful Unit Converter result, enter realistic values, compare relevant scenarios, check the calculation details, and review the definitions, assumptions, and limitations before using the estimate for an important decision.
One Fun Fact About Unit Conversion
The international inch is defined exactly as 25.4 millimeters. Because the relationship is exact, converting between inches and millimeters does not introduce uncertainty beyond the original measurement.
Conclusion
Reliable unit conversion begins by identifying the quantity, system, and exact unit definition. Choose compatible units, keep US and UK variants distinct, and match displayed precision to the source measurement.
Continue with the step-by-step unit conversion guide.
References
- NIST Guide to the SI, Appendix B.9: Conversion Factors, National Institute of Standards and Technology.
- SI Units, National Institute of Standards and Technology.
- The International System of Units, 9th edition, Bureau International des Poids et Mesures.