Shock Length Calculator

To fine-tune your vehicle’s suspension system, use following shock length calculator. In the calculator input form enter distance between upper and lower shock mount , distance between bump stop and axle and it will show you recommended length

Shock Length Calculator

Enter any two values to calculate the shock length.




























Shock length is the distance between the mounting points of the shock absorber. This length plays a vital role in maintaining the suspension performance of the vehicle and enabling the shocks to absorb impact.

How to calculate shock length

Guide: Tool Users

Input Action
Distance Upper to Lower Mounts (D1) Enter distance between shock mounts (e.g., 12 in).
Distance Bump Stop to Axle (D2) Enter distance between bump stop and axle (e.g., 4 in).
Click Calculate Displays collapsed and extended shock lengths.

Input Examples

Calculation Type D1 (in) D2 (in) Shock Length (SHOCK) (in)
Basic 12 4 7
Advanced 15 6 8

Formula for Shock Length

Calculate the shock length using:

SHOCK=(D1D2)1\text{SHOCK} = (D1 – D2) – 

Variable Description
SHOCK Shock Length (inches)
D1 Distance between upper and lower shock mounts (inches)
D2 Distance between bump stop and axle (inches)

Calculation Example

Step Calculation
Distance Upper to Lower (D1) 12 inches
Distance Bump Stop to Axle (D2) 4 inches
Shock Length Calculation (124)1=7(12 – 4) – 1 =  inches

Answer: The calculated shock length is 7 inches.

Shock Absorber Length Chart

Lift Height (in) Collapsed Length (in) Extended Length (in)
0 12.5 20
2 14.5 22
4 16.5 24
6 18.5 26
8 20.5 28
10 22.5 30

Importance

Importance Benefits
Ensures proper suspension performance Improves ride comfort
Enhances vehicle stability Reduces tire wear
Prevents bottoming out Increases safety
Customizes suspension setup Adapts to varied terrains
Matches shock length to lift height Optimizes off-road capability

FAQs

How to Choose the Correct Shock Size

Choosing the right shock size means measuring the frame of the vehicle at the mount locations and considering what the vehicle will be used for. Use the Shock Length Calculator to find the correct size.

What Size Shocks Do I Need for a 6 Inch Lift?

For a 6-inch lift, you’ll need longer shocks to match the extra length. Measure the new distance between the shock mounts after your lift, then use the calculator to find the proper shock length.

What Shocks Do I Need for a 3-Inch Lift?

For a 3-inch lift, measure from shock mount to shock mount after the lift. Plug these numbers into the calculator, and it will give you the proper shock size.

Using shock length calculator you surely adjust car shock length. In case you require any kind of additional information regarding this tool you can ask me in the comment section.

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