Convert
Export & Tools
Exports include all rows in the Results table below.
Results
| # | Category | Input | Output | Formula | Notes | Remove |
|---|
Example Conversions
| # | Category | From | To | Value | Expected |
|---|---|---|---|---|---|
| 1 | Length | km | mile | 10 | ~6.21371 |
| 2 | Mass | kg | lb | 5 | ~11.0231 |
| 3 | Temperature | celsius | fahrenheit | 25 | 77 |
| 4 | Volume | L | gallon | 3 | ~0.792516 |
| 5 | Area | m² | ft² | 20 | ~215.278 |
| 6 | Speed | km/h | mph | 100 | ~62.1371 |
Examples assume US customary definitions (e.g., US gallon).
Formulas Used
- Length: Convert to meters then divide by target factor. Example:
feet = meters / 0.3048. Factors: mm=0.001, cm=0.01, m=1, km=1000; inch=0.0254, foot=0.3048, yard=0.9144, mile=1609.344. - Mass: Convert to kilograms then divide by target factor. Factors: g=0.001, kg=1; ounce=0.028349523125, pound=0.45359237.
- Temperature:
F = C × 9⁄5 + 32. Inverse:C = (F − 32) × 5⁄9. - Volume (US): Convert to liters then divide by target factor. Factors: mL=0.001, L=1; fl oz=0.0295735295625, cup=0.2365882365, pint=0.473176473, quart=0.946352946, gallon=3.785411784.
- Area: Convert to square meters. Factors: cm²=0.0001, m²=1, hectare=10000, km²=1e6; ft²=0.09290304, yd²=0.83612736, acre=4046.8564224.
- Speed: Base is m/s. Factors: m/s=1, km/h=0.2777777778; ft/s=0.3048, mph=0.44704.
- Pressure: Base is pascal. Factors: Pa=1, kPa=1000, bar=100000; psi=6894.757293168.
- Energy: Base is joule. Factors: J=1, kJ=1000; BTU=1055.05585262.
- Power: Base is watt. Factors: W=1, kW=1000; horsepower=745.699872.
- Torque: Base is N·m. Factor: lb·ft=1.3558179483314.
All factors are based on widely accepted exact or near-exact definitions. Rounding may affect displayed results.
How to Use This Calculator
- Select the category (e.g., Length, Mass).
- Choose the metric unit and the desired standard unit.
- Enter a value and click Convert to see the result and the exact formula applied.
- Click Add to Table to store the conversion in the Results table.
- Use Download CSV or Download PDF to export your table for sharing or records.
- Load Example Conversions to see typical cases and verify expectations.
FAQs
The calculator uses common US customary measures such as inch, foot, yard, mile, ounce, pound, US gallon, PSI, BTU, horsepower and pound‑feet.
Most factors are exact by definition (e.g., 1 inch = 25.4 mm exactly). Others are widely accepted constants to many significant digits. Results are shown with sensible rounding.
Yes. Edit the
formatNumber function in the script to set the precision to your needs.
The examples and factors use US gallons. You can extend the volume map to add the UK gallon (4.54609 L) if needed.
Yes. The PDF export captures the entire Results table with headers, page numbers, and a timestamp.
Use the CSV export to download a spreadsheet‑ready file that you can open in Excel, Google Sheets, or any data tool.