The Complete ASICS Size Guide

Updated October 2026 — the centimetre and EU columns are checked against ASICS' published sizing. An earlier chart was shifted by half a size through the middle of the run, so if you sized off it, re-check your size below. Live ASICS stock and buyable sizes have been re-read for this update.

ASICS, renowned worldwide for their performance running and training shoes, combines innovative technology with precision fit. Getting the right size is crucial for both comfort and optimal performance.

This comprehensive guide will help you find your perfect ASICS fit.

PUSHAS carries ASICS across the full size run, and every pair is authenticated by hand — so once this guide has settled your size, you can see exactly what is buyable in it further down the page. The Gel-Kayano 20 'Raspberry' (2026) is live in 19 US men's sizes right now, and the full range sits in the ASICS collection.

ASICS Size Chart

How Do ASICS Fit?

ASICS running and training shoes typically fit true to size, with a precisely engineered fit designed for performance. The shoes feature a secure midfoot with adequate toe room, ensuring stability during dynamic movements.

Your ASICS should provide a secure fit in the heel and midfoot, with enough room in the toe box for natural toe spread during running movements.

See every model live now in the ASICS collection.

Key Features Affecting ASICS Fit

• GEL™ Technology: Cushioning system designed for shock absorption without compromising fit
• AHAR® Outsole: Durable rubber that maintains consistent ground feel
• FlyteFoam™: Lightweight midsole technology that maintains shape over time
• Engineered Mesh: Breathable upper that adapts to foot shape while maintaining support

How to Measure Your Foot

For the most accurate size selection:

1. Measure Late Day: Feet naturally swell throughout the day, so measure in the afternoon
2. Standing Position: Measure while standing to account for foot spread under weight
3. Both Feet: Measure both feet and use the larger measurement
4. Running Socks: Measure while wearing your preferred running socks

Expert Tips for ASICS Sizing

• Choose your true size - ASICS are engineered for precise fit
• Consider your running gait and pronation when selecting specific models
• The toe box should allow natural toe spread during running motion
• Technical running socks can affect fit - measure with your preferred sock type
• Different ASICS series (GT, KAYANO, NIMBUS) maintain consistent sizing
• Wide and narrow width options are available in most popular models
• Measure in centimetres and read the CM column; it beats converting US to EU

Different ASICS Series

All ASICS running shoes follow consistent sizing across their range:

• GEL-KAYANO: Premium stability shoes with consistent fit
• GEL-QUANTUM: Neutral cushioning with standard sizing
  
• GEL-NYC: Urban comfort with true-to-size fit
• GEL-KAHANA: Trail-derived cushioning with true-to-size fit
• GEL-VENTURE: Trail build, true to size, with a slightly roomier forefoot
• GT Series: Structured support with true-to-size fit
• Racing Models: May feel snugger for performance fit

ASICS series at a glance

Break-In Period

ASICS running shoes typically require minimal break-in:

• The engineered mesh upper adapts quickly to your foot shape
• GEL™ cushioning maintains consistent feel from first wear
• Start with shorter runs to allow natural adaptation
• Most models feel race-ready after 20-30 kilometers

ASICS in your size, buyable right now

Knowing your size only helps if the pair is actually buyable in it. These are a selection of ASICS models live at PUSHAS as we write, with the number of US men's sizes currently on the board — every listing also shows the women's conversion.

The full range sits in the ASICS collection. Sizing a Gel-Kayano specifically? Go to the complete ASICS Gel-Kayano size guide, which covers the 14 vs 20 fit difference in detail. If you have your size and now want to choose a colourway, start with our ranked breakdowns of the best Gel-Kayano 20 colourways and the best Gel-Kayano 14 colourways. For background, we have written up the history of the Gel-Kayano 14, why the reissued Gel-Kayano 20 is everywhere in 2026 and why the Gel-Venture 6 became the dad shoe of 2026.

ASICS sizing: frequently asked questions

What size ASICS should I get?

Your usual sneaker size. ASICS run true to size across the running and lifestyle range. The most accurate method is to measure your foot heel-to-longest-toe in centimetres and read that against the CM column in the chart above, rounding up if you fall between two rows.

Do ASICS run true to size?

Yes, for the large majority of wearers. The fit is secure through the heel and midfoot with genuine room at the toe, which can read as tighter than a lifestyle sneaker in the same size without actually being shorter. Racing models are the exception and can feel snugger by design.

Are ASICS Gel-Kayano and Gel-Venture sized the same?

They use the same size scale, so the same number is the same length in both. On foot the Gel-Venture 6 feels slightly roomier through the forefoot than a Gel-Kayano 20, which is the more contained cut of the two. Take your true size in either.

What is a men's 8 in women's ASICS sizing?

A US W9.5. ASICS men's and women's sizing runs exactly 1.5 sizes apart, and PUSHAS listings show both the men's and women's size, in the form "US M 9 / W 10.5", so women's buyers are not restricted to pairs released in women's colourways.

What is a US men's 9 in EU ASICS sizing?

EU 42.5, which is 27cm. Use the chart above rather than a general EU conversion, because ASICS' EU steps are not perfectly even across the run.

What is 27cm in ASICS sizes?

A US men's 9, which is a US women's 10.5 and an EU 42.5. Measure heel-to-longest-toe in the afternoon, standing, and round up if you land between two rows.

Do ASICS come in wide widths?

ASICS produces several running-line models in extended 2E and 4E widths, though standard width is the norm. If width rather than length is your problem, check what an individual listing specifies rather than assuming.

Do ASICS need breaking in?

Very little. The engineered mesh upper adapts to the foot quickly and the GEL cushioning feels the same from the first wear, so a pair that fits correctly on day one will not change much.

Where can I buy authentic ASICS?

ASICS are live at PUSHAS across the full size run, every pair authenticated by hand, with global shipping from Sydney and Los Angeles.

Conclusion

ASICS running shoes offer consistent and reliable sizing across their range. Using our size chart, calculator, and fitting tips, you can confidently select the right size for your training needs.

Remember that while these guidelines work for most runners, personal preference and running style play a role in finding your perfect fit.

Ready to buy? Browse the ASICS collection in your size.

Every pair at PUSHAS is authenticated by hand and ships worldwide from Sydney and Los Angeles, so you can shop with confidence.

Note: This size guide serves as a general reference. Individual fit may vary slightly based on personal preference and foot shape, and fit can differ between ASICS models and generations. We do not accept responsibility for discrepancies in fit arising from these differences.