Enter the saddle setback, arm length, and height of the cyclist into the calculator to estimate the handlebar reach (horizontal distance from the bottom bracket to the handlebar center). This calculator can also evaluate any of the variables given the others are known.

Handlebar Reach Calculator

Recommended Reach
Stem Swap Impact

Enter your height to get a recommended saddle-to-handlebar reach.

Related Calculators

Handlebar Reach Formula

This calculator uses the following simple heuristic to estimate handlebar reach. (Note: “reach” is not a single standardized measurement for the whole bike-and-rider system; for precise fitting, use full bike geometry and/or a professional fit.)

HR = (0.267 * H) + (0.4 * A) - S

Variables:

  • HR is the estimated handlebar reach (horizontal distance from the bottom bracket to the handlebar center; use any consistent length unit)
  • S is the saddle setback (horizontal distance from the bottom bracket to the saddle reference point; same unit as HR)
  • A is the arm length (same unit as HR)
  • H is the height of the cyclist (same unit as HR)

To estimate the handlebar reach, add 26.7% of the cyclist’s height to 40% of the arm length, then subtract the saddle setback.

What is a Handlebar Reach?

“Reach” can refer to a few different measurements in cycling. In frame geometry, reach is a frame measurement (the horizontal distance from the bottom bracket to the top of the head tube). Separately, drop handlebars often list a bar reach specification (distance from the bar clamp center to the furthest forward part of the drops/hood area).

On this page, handlebar reach refers to the horizontal distance from the bottom bracket to the center of the handlebars (i.e., where the bar is positioned relative to the bottom bracket). This depends on the bike’s frame geometry, stem length/angle, spacers, and handlebar shape, and it strongly affects rider posture and weight distribution.

How to Calculate Handlebar Reach?

The following steps outline how to calculate the Handlebar Reach using the given formula:

  1. First, determine the saddle setback (S) using your preferred unit (for example, centimeters).
  2. Next, determine the arm length (A) in the same unit.
  3. Next, determine the height of the cyclist (H) in the same unit.
  4. Using the formula HR = (0.267 * H) + (0.4 * A) – S, substitute the values of S, A, and H into the formula.
  5. Finally, calculate the Handlebar Reach (HR) in your chosen unit.
  6. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem:

Use the following variables as an example problem to test your knowledge:

Saddle setback (S) = 15 cm

Arm length (A) = 50 cm

Height of the cyclist (H) = 170 cm

HR = (0.267 × 170) + (0.4 × 50) − 15 = 45.39 + 20 − 15 = 50.39 cm