This Tool Life Durations calculator addresses two different conditions.

For turning and drilling of non-interrupted cuts, enter the cutting time per part in minutes on the right, click "Calculate", and see the number of parts one tool can cut on the right.

For milling, enter the Tool Diameter (in inches), Average WOC (Width Of Cut), and Time in cut (in minutes per part) on the left, click "Calculate," and see the minutes per insert on the right.

Tool life duration formulas are courtesy of Iscar Metals Inc., Arlington, TX.