Free online calculator
Reducer Calculator
Eccentric offset (flat side) and taper angle of a concentric/eccentric reducer.
How it works
- Eccentric offset = (D − d) ÷ 2
- Taper half-angle = atan(offset ÷ length)
- Concentric: same taper, centred
Worked example
D 168.3, d 114.3, L 152 → offset ≈ 27 mm, half-angle ≈ 10.1°.
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Reference tool — always validate against project specs. Not a substitute for a qualified engineer.