Stretch Calculator

Stretch Calculator combines tension (Hooke's Law), self-weight (hanging), bottom-end piston force, and temperature-driven length change to give you the elastic stretch of a tubing or casing string under load. Convert overpull to expected stretch, or measured stretch to a stuck-pipe free-point depth — essential for spacing out wireline or slickline tools, setting straight-pull permanent packers at the correct depth, and locating a stuck point in the field.

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.

See every formula worked through in detail on the Completion Engineering Formulas reference.

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, self-weight, and downhole temperature effects instead of guessing at the overpull. The same math, run in reverse, locates a stuck point in the field from a measured surface stretch and pull.

Key Features

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