TOOLS
Convert mm to inches as tape-measure fractions — 1/8 to 1/64 inch precision — and meters to feet and inches, in both directions. Results in m, cm, mm, decimal feet, decimal inches, and reduced fractions.
Conductor Diameter
0.8118 mm
0.03196 in
Values are for a bare solid conductor per ASTM B258. Stranded wire of the same AWG has a slightly larger overall diameter.
Equivalent AWG
20 AWG
Exact equivalent of the combined cross section
Wires Needed
—
Combining wires matches conductor cross section (current capacity), not the overall bundle diameter. Paralleled wires share current evenly only when their gauge, length, and terminations match, and bundled conductors also derate thermally.
Imperial Length
0.3937 in
Inches Fraction 25/64 in 0.08 mm under
Inches Fraction picks the closest fraction on a 1/64 inch grid and simplifies it, and the deviation shows how far that fraction sits from the exact value. Pick 1/8, 1/16 or 1/32 to see the nearest coarser fraction instead. The tape measure row uses 1/16 by default and always reduces to the simplest form.
This calculator provides engineering guidance only. AWG values describe bare solid conductors, so verify stranded constructions and critical dimensions against the manufacturer datasheet.
quick guide
Type on either side, and the other side converts as you type.
1. Type a metric length (mm, cm, or m) — the imperial side updates instantly with a tape-measure fraction. Or enter feet and inches to convert the other way.
2. Use the flip control between the two sides to swap the conversion direction.
3. Read every representation at once: meters, centimeters, millimeters, decimal feet, decimal inches, and a tape-measure fraction with selectable precision from 1/8 to 1/64 inch.
4. Paste lengths directly — “5 ft 6 in”, “6′2″” or “1.5 m” are recognized and filled in automatically.
A 30 mm dimension on a metric drawing is 30 ÷ 25.4 = 1.1811 inches. On a tape measure at 1/16-inch precision, that reads:
30 mm = 1 3/16 in
Need finer than 1/16? Switch the precision to 1/32 or 1/64 inch. It works for whole lengths too: 2.5 m = 8 ft 2 7/16 in — meters to feet and inches in one step, in either direction.
Both factors are exact by international definition, so no rounding is introduced in the conversion itself: 1 foot = 0.3048 m and 1 inch = 25.4 mm. Cable drawings and connector datasheets routinely mix the two systems, with overall length in inches and strip lengths in millimeters. That is why a both-ways converter with a tape-measure readout saves time on the bench.
Fractions are rounded to your selected precision and reduced to the simplest form (14/32 shows as 7/16). For toleranced dimensions on drawings, use the decimal values and apply the drawing’s own rounding rules.
Working with wire sizes too? Use the AWG to mm Calculator or the Combined Wire Gauge Calculator, or browse all our engineering tools.
