Roundness Calculator
Measure and analyze the circularity of objects with precision using our advanced roundness evaluation tool
Measurement Parameters
Tolerance Settings
Roundness Analysis Results
Enter your measurements to evaluate against roundness specifications.
Detailed Analysis
Your detailed roundness analysis will appear here.
📐 Roundness Standards Reference
| Standard | Grade 1 (µm) | Grade 2 (µm) | Grade 3 (µm) | Grade 4 (µm) |
|---|---|---|---|---|
| ISO 12181-1 | 0.1-0.5 | 0.5-1.5 | 1.5-4 | 4-10 |
| ASME Y14.5 | 0.2-0.8 | 0.8-2.5 | 2.5-6 | 6-15 |
| DIN 4760 | 0.1-0.4 | 0.4-1.6 | 1.6-6.3 | 6.3-25 |
| JIS B 0021 | 0.1-0.5 | 0.5-2 | 2-8 | 8-25 |
Note: Values represent typical roundness tolerance ranges for precision engineering applications.
🏭 Industrial Applications
Bearings
Roundness critical for load distribution and longevity in ball/roller bearings (typically <1µm tolerance)
Automotive
Cylinder bores, pistons, and shafts require precise roundness for proper sealing and rotation
Aerospace
Turbine blades and engine components demand extreme roundness precision (often <0.5µm)
Medical
Implants and surgical tools require high roundness for proper fit and function
Optics
Lens mounts and optical surfaces need exceptional roundness for alignment
General Machining
Roundness verification ensures quality in turned and ground components
📏 Measurement Best Practices
Sampling Density
For coordinate methods, use at least 32 equally spaced points for accurate roundness assessment
Measurement Plane
Ensure measurements are taken in the same cross-sectional plane for consistency
Centering
Properly center the part to avoid eccentricity effects in roundness measurement
Temperature
Measure at stable temperature (20°C ideal) as thermal expansion affects dimensions
Reference Circle
Understand different reference circles (MZC, MIC, MCC, MIC) for various applications
Multiple Measurements
Take measurements at several positions along the length for cylindrical parts
Note: This calculator provides engineering estimates based on standard roundness calculation methods. For critical applications, always verify with calibrated measurement equipment and certified standards.