O-Ring Calculators

Free tools that answer the practical questions that come up every day around O-Rings. Each one runs right in your browser, works on a phone, and lets you copy a link with your numbers filled in so you can send a result to a coworker or customer.

Available now

O-Ring Weight Calculator Pick an AS568 dash number or type your own inside diameter and cross-section, choose a compound, and get the weight per piece, per hundred, per thousand, and how many pieces make a pound. Handy for freight quotes, packaging, scrap value, and cycle counts.

O-Ring Groove Calculator Pick a gland type and a dash number and get the groove depth, width, corner radius, and lead-in chamfer to machine, plus the squeeze, gland fill, and stretch those dimensions produce. Covers face, piston, rod, and dovetail glands in static, hydraulic, and pneumatic duty.

O-Ring Cord Cut Length Calculator Making a ring from cord stock? Give it the inside diameter and cross-section, the way an O-Ring is specified, and get the exact length to cut, in inches, in millimeters, and in feet and inches for ordering. Takes an outside diameter instead if that is what your print gives you, and works backwards from a piece of cord you already have.

O-Ring Cord Tolerance Lookup Enter a cord cross-section, in inches or millimeters, and get all three ARPM Table 13 / ISO 3302-1 classes side by side: E1, E2 and E3, the real low-to-high window each one allows, what a molded O-Ring of the same cross-section is held to, and how many times wider the cord window is.

Coming soon

More are on the way. Got one that would make your job easier? Tell us about it.

Looking for dimensions instead? The Master O-Ring Size Chart covers AS568, metric, JIS, BS, and more, with tolerances.