Conversion Calculator
Adjust the inputs below. Results update as you type.
How it works
Enter a value, select the source unit, and choose the target unit. Temperature conversions use affine formulas (°F = °C × 9/5 + 32); all others are multiplicative ratios. Be careful with US vs. UK fluid ounces and tons (short ton = 2,000 lb; metric tonne = 2,204 lb; long ton = 2,240 lb). Nutritional Calories (kcal) differ from physics calories by a factor of 1,000.
Input guidance
- Confirm date/time/unit settings before comparing outputs.
- If a task has optional fields, run both with and without them to understand impact.
- Save scenario variants when making practical decisions.
The formula
Unit conversion multiplies by a conversion factor: value × (target units ÷ source units). Chained factors convert through intermediate units.
Worked example
5 miles × 1.60934 km/mile = 8.05 km. To convert back, divide by the same factor.
More examples to test
- Quick-pass example: run default assumptions for a first estimate.
- Refined example: update one assumption at a time to isolate impact.
How to interpret results
Use outputs as operational estimates and pair them with local constraints, business rules, or provider requirements.
When this can be inaccurate
Utilities can miss local policy details, special-case rules, and environment-specific constraints.
Change history
- July 2026: Published unit conversion path with category and precision notes.
Site-wide corrections also appear on the corrections log.
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General recommendation, not professional advice.
Frequently asked questions
How does unit conversion work?+
Multiply by a ratio equal to 1 (like 2.54 cm per inch) so the original unit cancels and the new unit remains.
How do I convert temperature?+
Temperature uses formulas, not simple ratios: °F = °C × 9/5 + 32, and °C = (°F − 32) × 5/9.
Why keep units consistent?+
Mixing units causes errors. Always convert everything to one system before adding, comparing, or multiplying.
Why are outputs slightly different from another tool?+
Different tools can use different rounding rules, default assumptions, and treatment of edge cases.
How can I improve estimate reliability?+
Use verified inputs from real records and re-run calculations after major assumption changes.
Guided next steps
Want the full workflow? Use this calculator inside a step-by-step guide.