Unit Converter
Unit Converter works out Converted value and Unrounded result from Value, Measurement type and From unit. The default figures on this page give converted value of 3.28084; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
2 steps
- 1 m = 3.28083989501 ft
- 1 x 3.28083989501 = 3.280839895 ft
Its 12 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
2 sources
What the Unit Converter calculates
Converts a quantity between any two units of the same physical family using exact SI-derived factors.
How to use this Unit Converter
Enter Value, Measurement type, From unit and To unit. Converted value updates as you type, and “Use a worked example” loads checked figures you can adjust. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Converted value, Unrounded result and Conversion.
The method follows NIST Special Publication 811, Guide for the Use of the International System of Units and BIPM, The International System of Units (SI Brochure).
1 metre to feet example
With Value: 1, From unit: m, To unit: ft, the calculator returns Unrounded result: 3.2808399. This example is checked against an independent source in the test suite.
What you can compare
Change one input at a time to see how it affects Converted value, Unrounded result and Conversion. The inputs you can vary are Value, Measurement type, From unit, To unit, Reading and Ruler divisions per inch.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
What information do I need for the Unit Converter?
You need Value, Measurement type, From unit, To unit, Reading, Ruler divisions per inch, Feet and Inches. The page opens with default figures that give converted value of 3.28084, so you can see the scale before entering your own.
What does this Unit Converter show?
It shows Converted value, Unrounded result, Conversion, Reading, Multiply by and Reverse conversion, with the working and any warnings for your entries.
Can I check how the Unit Converter result was calculated?
Yes. The “How this is worked out” section shows the calculation steps, and the sources section identifies the references used for the method.