Bike Size Calculator

Find your ideal frame size based on body measurements, bike type, and riding style.

Your Measurements

Size Recommendation

Calculate to see frame size recommendation with confidence level.

Interpretation

  • Frame size is a starting point — stem length and seatpost position allow fine-tuning.
  • Inseam is the most important measurement for sizing accuracy.
  • This calculator provides guidance but does not replace a professional bike fit.

What to Do Next

  • Use the Saddle Height Calculator to dial in seat position after choosing your frame.
  • When between sizes, consider your riding style: racing favors smaller, comfort favors larger.
  • Visit a local bike shop for a test ride on both sizes if you are borderline.

Methodology

Version v1.0
Updated 2026-06-20
Owner Cycling Regimen Editorial

  • LeMond method

    Inseam × 0.665 for road frame sizing (widely used since 1990s).

  • Multi-type support

    Separate formulas for road, gravel, MTB, and hybrid geometries.

  • Proportional analysis

    Optional arm length and torso ratio for reach guidance.

About Our Calculation Approach

Frequently Asked Questions

Is height or inseam more important for bike sizing?

Inseam is more important because it directly determines standover height and saddle-to-pedal distance. Two riders of the same height can have very different inseam lengths.

Should I size up or size down if I am between sizes?

It depends on your riding style. Size down for a more aggressive, race-oriented fit. Size up for more comfort and stability on long rides.

Does this calculator replace a bike fit?

No. This provides a strong starting point for frame selection, but a professional bike fit optimizes contact points (saddle, bars, cleats) for your specific body and goals.

Disclaimer: This calculator provides estimates based on published exercise science models. Results are not medical advice. Individual physiology, health status, and environmental conditions affect real-world outcomes. Consult a qualified healthcare provider or certified coach before making training decisions based on these outputs.