Convert foot length in inches to shoe sizes and shoe size charts in inches

Updated on by Stefan Banse

British and Americans still use inches instead of metric centimetres to measure length. Therefore, shoe sizes are also assigned on the basis of inches. It is not only for babies that shoe sizes are determined based on foot length in inches. Children's and adults' shoe sizes can also be converted to all international shoe sizes based on foot length in inches using the shoe size converter. Simply select "Foot length in inches". The calculator converts the inches into centimetres (1 inch = 2.54 cm) to then convert this foot length into the sizes of the other shoe size systems using the international ISO formula based on centimetres.


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Shoe size in inches - examples

Calculation of shoe sizes in inches according to ISO/TS 19407:2015

The foot length in inches is first converted into centimetres and then, according to ISO formulas, into the shoe size of the respective size system, i.e. the EU-, UK-, US- or Mondopoint-System. The following shoe size tables for foot length in inches are also based on this ISO specification. The ISO, i.e. the International Organization for Standardization, has defined the conversion of shoe size systems and thus issued this international pre-standard. However, there are often deviations from the theoretically calculated shoe sizes in inches. Shoes therefore often turn out smaller or larger simply because of deviating standardisation or depending on the manufacturer.

Basic information on converting shoe sizes to inches

All ISO conversion formulas refer to foot length. In the case of non-ISO size specifications, the length of the last in inches or the inside length of the shoe in inches is sometimes also chosen as the reference for calculating shoe sizes. For international standardisation, on the other hand, the foot length in centimetres or also in inches is the means of choice.

Normally, the foot length is used in the ISO formula to calculate the respective shoe size. If you now want to determine the foot length on the basis of a shoe size, the corresponding ISO formula is converted so that the result of the formula is the foot length, e.g. in inches, instead of the shoe size. This conversion of the conversion formula is explained in detail in the examples below.

Measure foot length in inches

To measure the foot length correctly, it is best to place a sheet of paper against a wall and place the foot on it so that the heel is directly against the wall and thus against the edge of the paper. Now draw along the toes with a pencil. It is important to hold the pencil straight at a 90° angle. Then measure the length from the back edge of the paper to the longest toe. Please measure both feet, as they can often be different lengths. Because the feet only reach their full size during the course of the day, it is better to measure in the afternoon.

Shoe size chart to convert foot length to inches for adults

Based on the ISO technical specification, the following shoe size table is given for different foot lengths in inches. According to the conversion from inches to centimetres (1 inch = 2.54 cm), the foot lengths are also given in centimetres. Each foot length in inches is thus assigned the appropriate shoe sizes of the individual shoe size systems.

Foot length in inches to adult shoe size chart according to ISO specification ISO/TS 19407:2015
Foot length, inch Foot length, cm Mondo­point EU UK US men US women
8.421.321534234
8.521.721534.52.53.54.5
8.722.022035345
8.822.322535.53.54.55.5
8.922.722536456
9.123.023036.5456
9.223.4235374.55.56.5
9.323.723537.5567
9.424.0240385.56.57.5
9.624.424538.55.56.57.5
9.724.724539678
9.825.025039.56.57.58.5
10.025.425540789
10.125.725540.57.58.59.5
10.226.0260417.58.59.5
10.426.426541.58910
10.526.7265428.59.510.5
10.627.027042.591011
10.827.4275439.510.511.5
10.927.727543.59.510.511.5
11.028.028044101112
11.228.428544.510.511.512.5
11.328.728545111213
11.429.029045.511.512.513.5
11.629.42954611.512.513.5
11.729.729546.5121314
11.830.03004712.513.514.5
12.030.530547.5131415
12.130.730548131415
12.231.031048.513.514.515.5
12.431.431549141516
12.531.731549.514.515.516.5
12.632.0032050151617
Foot length, inch Foot length, cm Mondo­point EU UK US men US women

Inch size chart for adults to print out

Here you will find the "Inch shoe size chart for adults" as an image to print out. For on the road and in the shoe shop. Always at hand. >>
Inch Shoe Size Chart for Adults

Shoe size chart to convert foot length to inches for children

In the conversion formulae for children, the toe clearance is calculated slightly differently from that for adults. For children, instead of an allowance of two shoe sizes, an allowance of eight percent of the foot length in inches is used. Also, in both the UK and US systems, children's sizes are numbered differently from adult sizes. In the UK and US, 13 children's sizes are followed by adult sizes starting with 0 or 1. Based on the ISO specification, the following shoe size chart is recommended for all children's shoe sizes.

Foot length in inches to shoe size chart for children according to ISO specification ISO/TS 19407:2015
Foot length, inch Foot length, cm Mondo­point EU UK US
4.712.012019.53.54
4.812.31252044.5
5.012.720.54.55
5.113.01302155.5
5.213.321.55.56
5.313.513522
5.413.814022.566.5
5.614.2236.57
5.714.614523.577.5
5.814.824
5.915.015024.57.58
6.115.41552588.5
6.215.725.58.59
6.316.01602699.5
6.516.426.5
6.516.6165279.510
6.716.917027.51010.5
6.817.32810.511
6.917.617528.51111.5
7.017.91802911.512
7.218.229.5
7.318.5185301212.5
7.418.830.512.513
7.619.2190311313.5
7.719.519531.513.51
7.819.832
7.920.020032.511.5
8.020.4205331.52
8.120.733.5
8.321.02103422.5
8.421.334.52.53
8.521.72153533.5
8.722.022035.53.54
8.822.436
8.922.622536.544.5
9.123.0230374.55
9.123.237.5
9.323.6235385
Foot length, inch Foot length, cm Mondo­point EU UK US

Some fields are not filled in this ISO size table for converting foot lengths in inches to shoe sizes. This is because the official ISO formula has not determined an exact value in the respective other size unit at the corresponding position. However, the shoe size converter for foot length in inches also determines the corresponding rounded sizes for the fields that are still open. Both the calculation and the rounding are then explained in detail in the calculator result at the info buttons.

Inch size chart for children to print out

Here you will find the "inch shoe size chart for children" as a printable image. Always at hand for on the road or in the shoe shop. >>
Inch Shoe Size Chart for Children

Example 1: Calculating foot length in inches using US size

Ms Klein has a US shoe size 7.5 and would like to use this size to calculate her foot length in inches. To do this, the ISO formula for calculating the US shoe size for women is converted accordingly.

ISO formula for calculating US women's size

US women's shoe size = (foot length in cm + 2 × 0.847) / 0.847 − 23

Explanations

  • One US size is equal to one third of an inch, therefore 0.847 cm.
  • The first 11 US sizes are not numbered.
  • The following 13 sizes are assigned as children's sizes
  • The American shoe sizes for women start with size 0 following the children's sizes.
  • Therefore, 23 sizes in total are subtracted
  • In addition, two US shoe sizes toe clearance, i.e. 2 × 0.847 cm are added on

Rearranged formula for calculating the foot length

Foot length in cm = (US women's shoe size + 23) × 0.847 − 2 × 0.847

Calculation of Ms Klein's foot length

(7.5 + 23) × 0.847 − 2 × 0.847 = 24.14 cm

Converted to inches, Ms Klein has a foot length of 9.5 inches.

Using this foot length in inches, the shoe sizes for the other size systems can then be calculated using the respective ISO formula.

Example 2: Calculating EU size using foot length in inches

Ms Klein's US shoe size 7.5 corresponds to a foot length of 9.5 inches, as we saw in example 1. Now, based on her foot length, we will calculate her corresponding EU shoe size here. To determine Ms Klein's EU size, we will first use the appropriate ISO conversion formula based on her foot length. Then the calculation result is rounded to the nearest whole or half size.

Formula for EU size

EU shoe size = (foot length in cm + 2 × 0.667) / 0.667

Explanations

  • One size equals two-thirds of a centimetre, i.e. 0.667 cm (0.2625 inch)
  • Sizes start at 0
  • Two sizes of toe clearance, i.e. 2 × 0.667 cm are added on.

Read more comprehensive information on EU shoe sizes here.

Calculation of the EU size

Ms Klein's foot length of 9.5 inches must first be converted into centimetres in order to use the ISO formula. Here, 9.5 inches corresponds to 24.13 centimetres. These can now be inserted into the formula.

(24.13 cm + 2 × 0.667) / 0.667 = 38.177 EU

Rounding the result

Rounded to the nearest whole or half size, this gives Ms Klein shoe size 38 EU.

Source information

As source for the information in the "Sizes of shoe" category, we have used in particular:

Last update on May 10, 2021

The last changes in the "Sizes of shoe" category were implemented by Stefan Banse on May 10, 2021. The main changes were: