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Convertor Inci Fracționari în MM.
Convertește inci fracționari în milimetri și invers. Introdu 3 1/4, 3-1/4, 1/4 sau 3.25 și obții o fracție exactă, redusă.
Introduceți valorile
Rezultatele se actualizează pe măsură ce tastați.
Cum se folosește
One inch is defined as exactly 25.4 mm, so every conversion here is exact up to the rounding you choose.
Accepted input formats: "3 1/4", "3-1/4", "1/4", improper fractions like "5/4", and plain decimals like "3.25".
Results are always reduced — you get 1/2, never 8/16, and a value that rounds up to a whole inch reads as 1, never 16/16.
Pick 1/16 for framing and general carpentry, 1/32 for cabinetry and joinery, and 1/64 for machining or fine woodwork.
Întrebări frecvente
How many millimetres are in an inch?
Exactly 25.4 mm. The international inch has been defined as precisely 25.4 millimetres since 1959, so inch-to-millimetre conversion is exact — the only approximation comes from rounding the fraction you read off a tape measure.
What input formats does this accept?
Mixed numbers with a space or hyphen ("3 1/4" or "3-1/4"), bare fractions ("1/4"), improper fractions ("5/4" = 1.25), and plain decimals ("3.25"). An inch mark or the word "in" on the end is fine too. Anything else returns a clear error rather than a silent wrong answer.
Why does it show 1/2 instead of 8/16?
Fractions are always reduced to lowest terms with a greatest-common-divisor step, so you get the form you would actually say out loud. For the same reason, a measurement that rounds up to a whole inch displays as "1", never "16/16".
Which precision should I choose — 1/16, 1/32 or 1/64?
1/16 in (1.59 mm) is the standard for framing, general carpentry and most tape measures. 1/32 in (0.79 mm) suits cabinetry, joinery and trim work. 1/64 in (0.40 mm) is for machining, metalwork and fine woodworking where a hair of slop matters.
How do I convert a decimal like 0.375 into a fraction?
Type it straight into the inches field. 0.375 in becomes 3/8 in (9.525 mm). The calculator rounds to your chosen denominator and then reduces, so decimals that land exactly on a fraction come out clean.