Engineering Tolerances & Fits Calculator
Calculate hole/shaft ranges, minimum clearance, maximum clearance, and fit type from basic size and deviations.
✓ Runs in your browser↔ Metric and inch unitsƒ Formula shown
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Enter machining data
Default values are examples. Replace them with your actual setup data.
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Formula and engineering notes
Formula / logic
Hole range = basic size + EI/EH. Shaft range = basic size + ei/es. Clearance = hole − shaft.
Hole range = basic size + EI/EH. Shaft range = basic size + ei/es. Clearance = hole − shaft.
Engineering disclaimer: these tools are for estimating and planning. Verify production parameters with toolmaker catalogs, machine limits, material data, and applicable standards.
Frequently asked questions
Can this result be used directly on a CNC machine?
Use it as a starting value only. Check the tool manufacturer data, machine limits, workholding, coolant and material condition before production.
Which units does the calculator support?
The calculator shows the units beside each input. Select metric or inch units where the page provides a unit-system control.
Why can shop results differ from the calculation?
Tool geometry, coating, runout, rigidity, chip evacuation, material hardness and machine power can change the practical result.