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This tool applies a standard formula from the relevant domain. The computation is deterministic — given the same inputs, the result is always identical. The formula accounts for the primary variables that determine the output.
n = −1 + log2(N) where N = intercepts per inch at 100×Updated: July 2026
A typical use case demonstrating the calculator with representative values.
→ Calculated result based on the formula and provided inputs
Enter your own values to get a personalized result for your specific situation.
→ Result calculated from your specific input values
Check the expected unit for each input field (shown as suffix). Converting between imperial and metric units before entering values prevents calculation errors.
This calculator uses the formula shown. Real-world results may vary due to factors not captured by the model. Use the result as an estimate and verify with domain-specific standards.
Calculate ASTM grain size number from intercept count. Free online tool with instant browser-based results — no account needed. It applies the calculation formula (n = −1 + log2(N) where N = intercepts per inch at 100×). For example: 45 intercepts per inch at 100× — A typical use case demonstrating the calculator with representative values.