Stretch Calculator

Stretch Calculator combines tension (Hooke's Law), piston/ballooning effects, and temperature-driven length change to give you the elastic stretch of a tubing or casing string under load. Convert overpull to expected stretch — essential for spacing out wireline or slickline tools, and for setting straight-pull permanent packers at the correct depth.

How It Works

Tension stretch (Hooke's Law) = (F × L) ÷ (A × E), where F is applied force, L is string length, A is cross-sectional steel area, and E is Young's modulus for steel.

When You'd Use It

When landing a tubing string in a hanger or setting a straight-pull permanent packer, engineers calculate expected elastic stretch under a given pickup weight so the string lands at exactly the intended depth — accounting for tension, ballooning, and downhole temperature effects instead of guessing at the overpull.

Key Features