How to Convert Chi (Chinese foot) to Millimetres (chi to mm)
Length conversions come up when reading overseas furniture specs, cycling the Round Island Route in kilometres while a foreign app shows miles, or checking marine distances in the Singapore Strait in nautical miles. This guide shows how to convert chi (chinese foot) into millimetres by hand, with examples and a quick-reference table.
The conversion
To convert chi (chinese foot) to millimetres, multiply the value by 333.3333333333. To go the other way, divide by the same number (or multiply by 0.003). For a quick estimate, multiply by about 330.
Millimetres = chi (chinese foot) × 333.3333333333
Worked examples
- 3 chi = 1,000 mm
- 12.5 chi = 4,166.67 mm
- 75 chi = 25,000 mm
Chi (Chinese foot) to Millimetres table
| Chi (Chinese foot) | Millimetres |
|---|---|
| 1 chi | 333.3333 mm |
| 2 chi | 666.6667 mm |
| 5 chi | 1,666.67 mm |
| 10 chi | 3,333.33 mm |
| 20 chi | 6,666.67 mm |
| 25 chi | 8,333.33 mm |
| 50 chi | 16,666.67 mm |
| 100 chi | 33,333.33 mm |
| 250 chi | 83,333.33 mm |
| 500 chi | 166,666.67 mm |
| 1,000 chi | 333,333.33 mm |
Common questions
Is chi to mm exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Millimetres to Chi (Chinese foot) converter.
Mistakes to avoid
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Forgetting squared and cubed units
Area and volume factors are the length factor squared or cubed, so 1 m² is about 10.76 sq ft, not 3.28.
Background
Many conversion factors are exact by definition. The inch has been defined as exactly 2.54 centimetres since 1959, and the pound as exactly 0.45359237 kilograms, so conversions involving them can be as precise as you need.
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
Writing the units next to every number while you work is the simplest way to avoid mistakes. If the units do not cancel to leave the one you want, the calculation is set up wrongly.
For any value, use the Chi (Chinese foot) to Millimetres Converter or browse all length converters.
Run your own numbers: Chi (Chinese foot) to Millimetres Converter