Unit Converters

Length Converter

Type any length value in any unit and every other unit updates instantly. Covers metric (mm, cm, m, km), imperial (in, ft, yd, mi), and nautical miles — with full precision output.

All units update live as you type No sign-up required Browser-only — works offline

Length

Type in any field — all other units update instantly

Features

  • All 9 length units update simultaneously as you type
  • Metric: millimetre, centimetre, metre, kilometre
  • Imperial: inch, foot, yard, mile
  • Nautical mile included
  • Click any output field to use it as a new input
  • Swap from/to with one click
  • Results to up to 8 significant figures
  • No upload, no account, fully browser-based

How to use it

  1. Select the unit you're converting from using the dropdown.
  2. Type your value into the input field.
  3. All other units update instantly — no button needed.
  4. Click any result field to set it as the new base.

Use cases

  • Converting cm to inches for product listings
  • Checking metric vs imperial specifications
  • Quick km to miles conversions for travel
  • Converting feet to metres for construction

Limitations

  • Browser processing depends on available device memory for very large inputs.
  • Tool-specific limits based on file format or browser support are noted on each tool page.
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Questions & answers

Frequently asked

How accurate is the length converter?

All conversion factors are SI-exact. Results show up to 10 significant figures using IEEE 754 double precision.

Can I convert nanometres or micrometres?

The standard tool covers mm to nautical miles. For nanometre/micrometre ranges, use scientific notation in the metre field.