Inches to Fraction Calculator
Table of contents
How to convert decimal to fraction inchesHow to convert distance in mm to inches fractionFraction to inches conversion tableLet's convert inches to fraction — inches to fraction calculator in practiceFAQsThis is the inches to fractions calculator, a simple and intuitive tool that helps you convert any decimal to fraction inches. Do you want to make a length conversion from mm to inches fraction? That's not a problem at all!
Alternatively, you can also turn any fraction to inches, and then to its inch fraction, adjusting for the appropriate precision. Converting inches to fractions has never been this entertaining, has it?
How to convert decimal to fraction inches
Transforming a distance in its decimal form to its fraction inches is almost the same as converting any decimal to a regular fraction. Almost. Principally, we have to find the ratio of two numbers, the numerator, and the denominator. The only difference is that the denominator should be to the power of 2: 2, 4, 8, 16, etc.
So, how to convert a decimal to an inch fraction?
 Let's take your decimal value, $x$;
 Choose the precision, or in other words, the value of the denominator, $d$;
 Multiply these numbers and round them to the closest whole number, $n = \mathrm {round}(d \cdot x)$;
 The resulting inch fraction is then ^{n} /_{d}.
You can also use our ratio calculator to aid you in doing the math.
As you can see, the outcome is sometimes only an approximation of the real value because of rounding. But for typical everyday measurements, it's accurate enough, especially when you choose a precision of $^{1}/_{32}$ or higher.
💡 Check our decimal to fraction calculator if you want to get the results without losing the precision!
🙋 Did you know that music intervals also rely on dyadic fractions (fractions with the denominator 2ⁿ), as it concerns frequencies?
How to convert distance in mm to inches fraction
Imagine you want to buy new tires for your bike, or you're preparing a spot for your new TV. You take out your ruler or meterstick and get to measuring. But it's in mm, or cm, or another metric unit your not exactly familiar with. So, is there an easy way to convert mm to inches fraction?
The answer is YES:

If you have the length in mm, divide the result by $25.4$;

If you have the length in cm, divide the result by $2.54$;

If you have the length in m, divide the result by $0.0254$;

Then convert this decimal to fraction inches as you've learned from the previous section.
You can convert any length unit to inches, but you don't have to remember all the formulas by heart — just use our inches to fraction calculator, and choose one of the most common length units.
Fraction to inches conversion table
Take a look at this table if you want to find any inch fraction between 0" and 1" with steps of 1⁄64".
Fraction Inches  Decimal Inches ["]  Millimeters [mm] 

1⁄64"  0.015625  0.396875 
1⁄32"  0.03125  0.79375 
3⁄64"  0.046875  1.190625 
1⁄16"  0.0625  1.5875 
5⁄64"  0.078125  1.984375 
3⁄32"  0.09375  2.38125 
7⁄64"  0.109375  2.778125 
1⁄8"  0.125  3.175 
9⁄64"  0.140625  3.571875 
5⁄32"  0.15625  3.96875 
11⁄64"  0.171875  4.365625 
3⁄16"  0.1875  4.7625 
13⁄64"  0.203125  5.159375 
7⁄32"  0.21875  5.55625 
15⁄64"  0.234375  5.953125 
1⁄4"  0.25  6.35 
17⁄64"  0.265625  6.746875 
9⁄32"  0.28125  7.14375 
19⁄64"  0.296875  7.540625 
5⁄16"  0.3125  7.9375 
21⁄64"  0.328125  8.334375 
11⁄32"  0.34375  8.73125 
23⁄64"  0.359375  9.128125 
3⁄8"  0.375  9.525 
25⁄64"  0.390625  9.921875 
13⁄32"  0.40625  10.31875 
27⁄64"  0.421875  10.715625 
7⁄16"  0.4375  11.1125 
29⁄64"  0.453125  11.509375 
15⁄32"  0.46875  11.90625 
31⁄64"  0.484375  12.303125 
1⁄2"  0.5  12.7 
33⁄64"  0.515625  13.096875 
17⁄32"  0.53125  13.49375 
35⁄64"  0.546875  13.890625 
9⁄16"  0.5625  14.2875 
37⁄64"  0.578125  14.684375 
19⁄32"  0.59375  15.08125 
39⁄64"  0.609375  15.478125 
5⁄8"  0.625  15.875 
41⁄64"  0.640625  16.271875 
21⁄32"  0.65625  16.66875 
43⁄64"  0.671875  17.065625 
11⁄16"  0.6875  17.4625 
45⁄64"  0.703125  17.859375 
23⁄32"  0.71875  18.25625 
47⁄64"  0.734375  18.653125 
3⁄4"  0.75  19.05 
49⁄64"  0.765625  19.446875 
25⁄32"  0.78125  19.84375 
51⁄64"  0.796875  20.240625 
13⁄16"  0.8125  20.6375 
53⁄64"  0.828125  21.034375 
27⁄32"  0.84375  21.43125 
55⁄64"  0.859375  21.828125 
7⁄8"  0.875  22.225 
57⁄64"  0.890625  22.621875 
29⁄32"  0.90625  23.01875 
59⁄64"  0.921875  23.415625 
15⁄16"  0.9375  23.8125 
61⁄64"  0.953125  24.209375 
31⁄32"  0.96875  24.60625 
63⁄64"  0.984375  25.003125 
1"  1  25.4 
Let's convert inches to fraction — inches to fraction calculator in practice
Imagine you've bought a wooden panel, 5 meters long. You plan to cut it into six equal parts, but you have only a tape measure with the fractional inches scale. We can measure the length with precision down to ¹/₃₂". Here is how to deal with the problem:

Divide 5 m by 6, $5 \text{ m} / 6 = \text{ }^5/_6 \text{ m}$. It's the length of each part.

Convert the measurement in m to inches by dividing the value by 0.0254 and rounding the outcome to two decimal digits (those will be our significant figures):
$(^5/_6 \text{ m}) / 0.0254 = 32.81 \text{ in}$ 
Our precision is $^{1}/_{32}\,''$. Multiply the value above by 32:
$32.81 × 32 = 1049.92$ 
Round the outcome to the nearest whole number, $1050$.

Finally, we can convert the length from inches to fraction: $^{1050}/_{32}\,''$.

As there are countless equivalent fractions to our result (try Omni's equivalent fractions calculator for the proof), we can make our lives easier by simplifying this inch fraction. Find the least common multiple of 1050 and 32, which is 2. Divide both numerator and denominator by 2, so we get $^{525}/_{16}\,''$. As it's an improper fraction, convert it to a mixed number: $32\ ^{13}/_{16}\,''$ (you can use the modulo operation to find the quotient quickly). If you want to go even further, let's extract feet from the mm to inches fraction conversion result. The result is finally: $2'\ 8\ ^{13}/_{16}\,''$
As you can see, you should take a few steps to obtain the outcome. You can save time by using our inches to fractions calculator, which shows the result immediately!
How do I convert decimal inches to fractional inches?
To convert from decimal inches to fractional inches:

Choose a denominator d that's a power of 2 (2, 4, 8, 16, etc.).

Take the decimal part of the measurement in inches. We'll call it x.

Multiply the decimal part by the denominator: x × d.

Round up your result. This will be the numerator n of the fraction.

Indicate the decimal part as n/d inches.

Express your initial value as the whole N and the fraction parts:
N n/d in.
What's 12 mm to fractional inches?
It's 15/32 in. When expressing millimeters in fractional inches, we first need to convert from millimeters to inches using the conversion factor of 25.4 mm to 1 inch.
Then, to indicate the measurement as an inch fraction, we choose a denominator that is a power of 2 (such as 32) and calculate the numerator by rounding up the result of multiplying the decimal part of the measurement value by the denominator.
How do I convert 7 mm to fractional inches?
To convert 7 mm to fractional inches:

Convert from millimeters to inches:
7 mm × (1 in /25.4 mm) = 0.2756 in

Choose a denominator d that's a power of 2, let's say 32.

Identify the decimal part of the measurement, x. In our case:
x = 0.2756 in

Determine the numerator n by multiplying the decimal part by the denominator and rounding up:
n = (x × d)
n = (0.2756 × 32), rounded up= 9. 
Express the 7 mm measurement as the fraction n/d. This is 9/32 in.
What is 11.81 inches as a fraction?
It's 11 13/16 in. To express the measurement in fractional inches, we use 16 as a denominator, then calculate the numerator by rounding up the result of multiplying the decimal part of the measurement value by the denominator. Finally, we express the measurement as a mixed number, the whole and the fractional parts.