Length converter

Meters to millimeters.

Convert a larger metric length into the fine units used on a cutting list or engineering drawing.

Meters (m)Inch fraction precision

1.2 m = 1,200 mm

Nearest inch fraction≈ 47 1/4 in

Fraction rounding difference+0.15 mm

Metric length1,200 mm

Feet and inches3 ft 11.2441 in

The marker shows the fractional part of one inch. This diagram illustrates tick positions; it is not a physical-size ruler.

Reverse conversion ↔Measure on screen ↗

Conversion formula

millimeters = meters × 1000

Enter the source length above. The result updates immediately. These calculations use exact length definitions: 1 m = 100 cm = 1000 mm, 1 in = 25.4 mm, and 1 ft = 12 in. Only the displayed answer and fractional ruler mark are rounded. The feet-and-inches output splits a length into whole feet and remaining inches; decimal feet do not encode an inch count.

Worked example

A shelf length of 1.2 m becomes 1200 mm. A clearance of 0.004 m becomes 4 mm. Converting these quantities before making a cutting list avoids mixing meters and millimeters in the same arithmetic. The conversion itself does not add a cutting allowance.

Conversion table: m → mm

Select a source value to load it into the calculator. Decimal results are displayed to at most six places; inch fractions in this table are rounded to 1/16 inch.

Meters → Millimeters
Meters (m)	Millimeters (mm)	Nearest inch fraction
	1	≈ 1/16 in
	4	≈ 3/16 in
	10	≈ 3/8 in
	100	≈ 3 15/16 in
	250	≈ 9 13/16 in
	500	≈ 19 11/16 in
	1,000	≈ 39 3/8 in
	1,200	≈ 47 1/4 in
	2,000	≈ 78 3/4 in
	5,000	≈ 196 7/8 in

When to use this conversion

Use this when a supplier quotes a length in meters but a drawing, ruler, or workshop instruction uses millimeters. Enter the complete meter measurement, including decimal places. Add allowances for saw kerf, joints, or thermal expansion separately rather than hiding them inside a unit conversion.

Do not confuse millimeters with milliliters, which measure volume. A dimensional specification should keep its unit next to the number, especially when a large result such as 1200 could otherwise be mistaken for centimeters.

Exact conversion versus a ruler reading

The unit relationship is exact, but a measured object may have uncertainty. At 1/16 inch, the maximum rounding difference is half a tick: 1/32 inch, or 0.79375 mm. The calculator shows the actual rounding difference for your value. Use a finer division only if the source measurement and physical instrument support that precision.

Next steps

Numerical conversion needs no display calibration. Comparing a physical object against your screen does. Use the ruler for small objects, a verified paper ruler away from your display, or an appropriate calibrated instrument for safety-critical measurements.

Measure on screen Printable ruler PDFs Screen calibration guide How to read a ruler

Related converters

Millimeters to meters.Turn a detailed drawing dimension into a room-scale length while keeping every millimeter in the calculation.Inches to millimeters.Convert a decimal, fraction, or mixed inch measurement into millimeters. No need to turn 2 3/8 into a decimal first.Centimeters to millimeters.Move between centimeter readings and millimeter dimensions without losing the decimal part.Meters to centimeters.Bring room-scale or fabric measurements into the centimeter units found on a tape measure.Meters to inches.Translate a metric length into decimal inches, then choose a fractional tick only if the job permits rounding.

Length converters ↗

Reference: NIST unit conversion factors. Calculations use the international foot, not historical survey-foot units. Fractions are explicitly approximate. NIST ↗