Foot length → Mondo → shell check

Ski Boot Size Chart & Mondo Calculator

Measure the longer foot for a starting Mondo, then verify the exact boot with a shell check.

Foot length

Heel to longest toe, standing. Measure both feet and use the longer.

How to measure in 60 seconds

Put paper on a hard floor with one edge against a wall.
Follow the chosen brand's method: current charts differ between barefoot and a thin ski sock. Add no allowance.
Stand with your heel at the wall and weight on that foot.
Mark the longest toe with the pencil upright.
Measure wall to mark; repeat and use the longer foot.

Calculations stay in your browser. Nothing is sent or saved; Share adds a URL fragment only when you choose it.

The interactive calculator did not load. The measuring guide, shell-check steps, and full chart below are still available.

Measure once. Leave with a plan.

Enter the longer foot. You will get a starting Mondo, shell-break checks, conversions, and the physical next step.

Physical verification

The label is only a starting point. A liner-out heel-gap check tells you whether this exact physical shell is close, average, or clearly too roomy.

Remove the linerMeasure the plastic shell, not the cushioned inner boot.
Wear a thin ski sockSlide the foot into the empty shell with the heel down.
Touch the front lightlyLet the longest toe just meet the shell; do not curl the toes.
Measure behind the heelEnter the gap in millimetres in “Check a boot.” About 10 mm is close, 20 mm average, and 30 mm too large in Atomic's current reference.

Reference zones are fitting guidance, not a diagnosis. Side contact, instep, heel pocket, liner and cuff still need assessment.

Heel-gap reference · millimetres

0–5

5–10

10–15

15–20

20–30+

Atomic's current broad reference anchors are about 10 mm close, 20 mm average, and 30 mm too large. Confirm the whole foot and exact model.

Print calibration · 100 mm

Verify this line with a real ruler. Print at 100% / Actual size; printer scaling varies.

skibootsizechart.com · measured result generated in your browser

Static reference

Mondo is primary. US/UK/EU labels are approximate and vary by manufacturer, product category, and model.

Swipe chart →

Approximate Mondo ski boot size conversions from 14.0 to 34.5
Mondo / cm	US Kids / Youth	US Men	US Women	UK	EU
14.0	7K–8K	—	—	6.5K–7.5K	23–24⅔
14.5	7K–8K	—	—	6.5K–7.5K	23–24⅔
15.0	8K–9K	—	—	7.5K–8.5K	24⅔–26
15.5	8K–9K	—	—	7.5K–8.5K	24⅔–26
16.0	9K–10K	—	—	8.5K–9.5K	26–27⅔
16.5	9K–10K	—	—	8.5K–9.5K	26–27⅔
17.0	10K–11.5K	—	—	9.5K–11K	27⅔–29
17.5	10K–11.5K	—	—	9.5K–11K	27⅔–29
18.0	11.5K–12.5K	—	—	11K–12K	29–30⅔
18.5	11.5K–12.5K	—	—	11K–12K	29–30⅔
19.0	12.5K–13.5K	—	—	12K–13K	30⅔–32
19.5	12.5K–13.5K	—	—	12K–13K	30⅔–32
20.0	1Y–2Y	—	—	0.5–1.5	32–33⅔
20.5	1Y–2Y	—	—	0.5–1.5	32–33⅔
21.0	2Y–3Y	—	—	1.5–2.5	33⅔–35
21.5	2Y–3Y	—	—	1.5–2.5	33⅔–35
22.0	3Y–4Y	4	5	3	35
22.5	4Y–4.5Y	4.5	5.5	3.5	36
23.0	—	5	6	4	36.5
23.5	—	5.5	6.5	4.5	37
24.0	—	6	7	5	38
24.5	—	6.5	7.5	5.5	38.5
25.0	—	7	8	6	39
25.5	—	7.5	8.5	6.5	40
26.0	—	8	9	7	40.5
26.5	—	8.5	9.5	7.5	41
27.0	—	9	10	8	42
27.5	—	9.5	10.5	8.5	42.5
28.0	—	10	11	9	43
28.5	—	10.5	11.5	9.5	44
29.0	—	11	12	10	44.5
29.5	—	11.5	12.5	10.5	45
30.0	—	12	13	11	45.5
30.5	—	12.5	13.5	11.5	46
31.0	—	13	14	12	47
31.5	—	13.5	14.5	12.5	47.5
32.0	—	14	15	13	48
32.5	—	15.5–16	—	14.5	50–50.5
33.0	—	16–16.5	—	15–15.5	51
33.5	—	17	—	15.5–16	51.5–52
34.0	—	17.5	—	16–16.5	52.5
34.5	—	18	—	17	53–53.5

What the number cannot see

Published last width is model-specific and usually quoted at a reference shell size. It cannot be prescribed from one width ratio.

Two feet with the same length can need different heel pockets, instep heights, liners and shell shapes.

Flex indexes are not standardized across brands. Build, strength, ankle movement, temperature and boot construction all change how a number feels.