Convert Ell to Millimeter
Convert ells to millimeters instantly. 1 ell = 1143 millimeter — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Millimeter to Ell converter for the reverse conversion.
Units explained
Ell
An ell is an Imperial unit of length equal to 45 inches (1.143 m), historically used as the standard measure of cloth in English commerce.
The ell derives from old English elna (forearm) and was standardised in medieval English trade as the cloth-measuring yard equivalent. The English ell is 45 inches; other regional ells differed.
Ells appear in historical English commerce records (especially cloth and tapestry trade). Used in legal documents through the 19th century; rare in modern commerce but referenced in literary and historical contexts.
Medieval English cloth-trade origin; standardised at 45 inches; became exact via the 1959 International Yard and Pound Agreement.
Millimeter
A millimeter is a metric unit of length equal to one thousandth of a meter (1/1000 m). It is the standard small-scale unit in the SI system and is widely used wherever sub-centimeter precision matters.
The millimeter was defined alongside the meter when France adopted the metric system in 1795, using the standard SI prefix milli- (from Latin mille, "thousand") to denote one-thousandth.
Millimeters are used in engineering drawings, machining, manufacturing, paper sizes, rainfall measurement, and any context where dimensions below one centimeter need to be specified clearly. Most rulers worldwide are marked in millimeters.
Adopted in 1795 in France as part of the original metric system; standardized internationally by the Metre Convention in 1875 and confirmed in the SI in 1960.
Ell to Millimeter conversion formula
The relationship between ells and millimeters:
To convert ells to millimeters, multiply the value in ells by 1143. To reverse, multiply millimeters by 0.0008748906.
How to use this converter
Type a value into the calculator. The result in millimeters updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Millimeter to Ell converter for the reverse direction.
Step-by-step: convert ells to millimeters
- Write down the value in ells (ell).
- Multiply that value by the factor 1143.
- The product is the equivalent value in millimeters (mm).
- To reverse, multiply the millimeter value by 0.0008748906.
Worked examples
Example 1 — Convert 1 ell to mm:
1 × 1143 = 1143 mm
Example 2 — Convert 100 ell to mm:
100 × 1143 = 114300 mm
Real-world example — Pet and accessory dimensions
A 3-ell dog leash equals a tidy round value in millimeters. Pet-supply shopping frequently mixes the two units across product specifications.
3 ell × 1143 = 3429 mm
Real-world example — Fabric and tailoring
One ell of fabric converts to a value in millimeters commonly used for seam allowances. Garment patterns frequently switch between the two units on a single instruction sheet.
1 ell × 1143 = 1143 mm
Real-world example — Body height conversion (reverse direction)
You measure 1.75 ells tall and need to fill in a gym membership form or medical record that asks for height in millimeters. This is the most-used everyday length conversion in metric-using countries.
1.75 ell × 1143 = 2000.25 mm
Ell to Millimeter conversion table
Standard reference values for converting ells to millimeters:
| Ell [ell] | Millimeter [mm] |
|---|---|
| 0.01 | 11.43 |
| 0.1 | 114.3 |
| 1 | 1143 |
| 2 | 2286 |
| 3 | 3429 |
| 4 | 4572 |
| 5 | 5715 |
| 10 | 11430 |
| 20 | 22860 |
| 30 | 34290 |
| 40 | 45720 |
| 50 | 57150 |
| 100 | 114300 |
| 500 | 571500 |
| 1000 | 1143000 |
Frequently asked questions
How many millimeters is 1 ell?
How do I convert ells to millimeters?
How do I convert millimeters back to ells?
How many millimeters is 100 ells?
Popular length unit conversions
Convert Ell to other length units
Show all Ell conversions
Metric / SI (4 units)
Imperial / US Customary (26 units)
Sources & references
Conversion factor (1 ell = 1143 mm) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.