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Sieve analysis · Particle size · Calibration

Sieve analysis calculators built to the standards

Particle size distribution, mesh conversion and sieve calibration — every formula traceable to ASTM E11, ISO 3310-1, ISO 9276 and NBR NM 248. Free, bilingual, no ads.

Size distribution calculatorConvert mesh sizes
±35 µm (E11 Table 1)
Test sieve wire cloth — aperture w, wire d

ISO 565 R20/3 principal series

125 mm → 45 µm · ratio ≈ ⁴√2

125 mm

31.5 mm

8.0 mm

2.00 mm

500 µm

125 µm

The toolbox

Ten instruments, one audited engine

Each calculator cites the standard it implements. No fitted-by-eye formulas — lookups and methods come straight from the published tables.

  1. 01ISO 9276ASTM D2487

    Size Distribution Calculator

    Cumulative curve, D10–D90 and Cu/Cc from masses retained per sieve.

    Open
  2. 02ASTM E11ISO 565

    Sieve Aperture Calculator

    Nominal apertures and the three E11/ISO tolerances for every standard sieve.

    Open
  3. 03ISO 9276-1ASTM D2487

    Particle Size Calculator

    Mean, median, standard deviation and D-values from individually measured particle diameters.

    Open
  4. 04ASTM E11Tyler

    Mesh Converter

    US mesh ↔ Tyler ↔ µm/mm, strictly by the published tables.

    Open
  5. 05NBR NM 248NBR 7211

    Fineness Modulus Calculator

    Fineness modulus per NBR NM 248 with NBR 7211 grading zones for fine aggregate.

    Open
  6. 06ISO 3310-1

    Sieve Calibration (ISO 3310-1)

    Compliance, inspection and calibration verdicts from measured apertures per ISO 3310-1:2016 Tables 1 and 2.

    Open
  7. 07ISO 3310-1ASTM E11

    Microsphere Equivalent Aperture

    Estimate a sieve's effective cut point (d50) from a calibrated microsphere test.

    Open
  8. 08ISO 13322-1ISO 9276-6

    PoreSizer™ Image Analysis

    Particle sizing from micrographs — flood fill, scale calibration, ISO 13322.

    Open
  9. 09ISO 16889

    Cut Point Test

    Filter beta ratio and cut points from upstream/downstream counts.

    Open
  10. 10GUMJCGM 100:2008

    GUM Uncertainty Budget

    Combine Type A and Type B uncertainty components into a combined and expanded uncertainty (k=2).

    Open
  11. 11ISO 12103-1Darcy

    Filter Testing Simulator

    Educational filtration scenarios — efficiency and pressure drop over time.

    Open
  12. 12ISO 3310-1ASTM E11

    Sieve Calibration Database

    Local log of your lab's test sieves — history, verdicts and recalibration alerts.

    Open