// multi-utility computation suite · offline · instant · precise
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sci.Rosin-Rammler-particle-size Calculator
Calculates particle size distribution parameters (D₆₃ characteristic size and Rosin-Rammler width n) from sieve or laser diffraction data: R = exp(−(d/D)^n). R-R width n: narrow distributions have n > 3; wide distributions n ≈ 1 — cement particle size follows Rosin-Rammler with n ≈ 1.
Inputs
D63 Um
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
N Spread
Reference formula or conversion factor shown for context.
D Query Um
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
Results
% oversize R(d) at query diameter
The computed diameter -- twice the radius.
% passing P(d)
Sample size or count used in the calculation.
d₁₀ (10% passing, μm)
Sample size or count used in the calculation.
d₉₀ (90% passing, μm)
Sample size or count used in the calculation.
R(d) = exp(-(d/d₆₃)ⁿ)
Reference formula or conversion factor shown for context.
n interpretation
Qualitative summary of what the computed numbers mean in practical terms.