Fractional inches and metric length converter
Convert feet/inches and fractions into metric lengths.
Your inputs
Your results
Ready when you areYour results will appear here.
How it works
Combine whole feet with decimal or fractional inches, convert to metric with the exact inch definition and display an optional rounded fractional-inch approximation.
Read the source reference ↗A few things to know
No negative lengths, tolerance recommendation or cut compensation. Fraction display is rounded and may be unsimplified. Feet are whole numbers; inches can exceed twelve and are added as entered.
When to use this tool
Convert a cut-list measurement while preserving fractional input. Metric output comes from the original length, not the rounded fraction display.
- Convert a woodworking measurement.
- Read a fractional cut list.
- Compare metric and inch dimensions.
How to use fractional inches and metric length converter
Prepare the inputs
Enter the quantities and units used by your source.
Choose the settings
Choose the assumptions and compare them with your actual situation.
Review and export
Review the result, then download the calculation report.
Try the supplied example
Inputs
feet: 5; inches: 2 3/8; denominator: 16
Result
5 feet and 2 3/8 inches equals 62.375 inches or 1584.325 millimetres.
What it means
Choose a display denominator that fits your ruler and check tolerances separately.
Common mistakes to avoid
Use an actual fraction denominator
Use an actual fraction denominator.
Rounding display is not manufacturing tolerance
Rounding display is not manufacturing tolerance.
Frequently asked questions
Definitions, edge cases, and practical next steps for this tool. Search all tool FAQs ↗
Can I enter mixed fractions?
Yes, for example 2 3/8.
Can the denominator be zero?
No. Fraction denominators must be positive.
Are inches normalized to less than twelve?
They are added to feet as entered, so larger inch values still produce a valid total.
Is the metric conversion rounded first?
No. It uses the original entered length.
What does nearest 1/N mean?
The optional display rounds to a step of one divided by N inch.
Can I calculate negative offsets?
No. This tool is for nonnegative physical lengths.
Are my inputs uploaded or stored?
Processing happens locally in your browser. This tool does not upload inputs. Downloads stay on your device; sharing or opening them in another service is your choice.
What should I check before using the output?
No negative lengths, tolerance recommendation or cut compensation. Fraction display is rounded and may be unsimplified. Feet are whole numbers; inches can exceed twelve and are added as entered.
Explore the topic in the blog
Sources and method
Use the references below to check definitions and platform guidance. The model’s scope and limits are explained above. Read our editorial standards.