Professional Sieve Analysis & Gradation Calculator
Sieve Analysis Calculator
Enter the individual weight retained on each sieve to calculate cumulative weights and percentages.
Weight retained on the top sieve (grams or kg).
Please enter a valid non-negative number.
Weight retained on the second sieve.
Weight retained on the third sieve.
Weight retained on the fourth sieve.
Weight retained on the fifth sieve.
Material passing all sieves (collected in pan).
Total Sample Weight
0.00 g
Total Cumulative Retained
0.00 g
Fineness Modulus (Est.)
0.00
Check Sum Status
Valid
Detailed Breakdown
Sieve ID
Weight Retained (g)
Cumulative Weight (g)
% Cumulative Retained
% Passing
Particle Distribution Chart
What is Cumulative Weight Retained?
Cumulative weight retained is a fundamental metric used in civil engineering, geology, and construction materials testing. It refers to the total amount of material that fails to pass through a specific sieve in a stack, plus all the material retained on the coarser sieves above it. This calculation is the cornerstone of sieve analysis (also known as a gradation test), which determines the particle size distribution of granular materials like sand, gravel, soil, and crushed stone.
Engineers and technicians use this metric to verify if an aggregate meets specific construction standards (such as ASTM C136 or AASHTO T 27). Understanding how to calculate cumulative weight retained ensures that concrete mixes, asphalt pavements, and structural foundations have the correct density, drainage, and strength properties.
Who uses this? Civil engineers, lab technicians, geotechnical experts, and construction quality control managers rely on these calculations daily to certify materials.
Cumulative Weight Retained Formula and Mathematical Explanation
The calculation is a sequential summation process. To find the cumulative weight retained on any specific sieve, you add the weight retained on that sieve to the sum of weights retained on all sieves with larger openings (those above it).
Where Cumulative Weighti-1 is the cumulative weight of the sieve immediately above the current one. For the very first (coarsest) sieve, the cumulative weight is simply equal to its individual retained weight.
Variable Definitions
Variable
Meaning
Unit
Typical Range
Weight Retained
Mass of material caught on a specific sieve
Grams (g) or kg
0 – 5000+
Cumulative Weight
Running total of retained weights
Grams (g) or kg
0 – Total Sample
Total Sample Weight
Sum of all retained weights + Pan
Grams (g) or kg
500 – 10,000+
% Cumulative Retained
(Cumulative Weight / Total Weight) × 100
Percentage (%)
0% – 100%
Practical Examples (Real-World Use Cases)
Example 1: Fine Aggregate (Sand) Analysis
A lab technician tests a 500g sample of sand for concrete. The weights retained on each sieve are measured. Here is how to calculate cumulative weight retained for this sample:
Financial/Project Impact: If the cumulative % retained on the No. 30 sieve is too high, the sand is too coarse, potentially requiring more expensive cement paste to fill voids, increasing project costs.
Example 2: Coarse Aggregate (Gravel)
For a road base project, a larger sample of 2000g is tested.
The Percent Cumulative Retained for the 1/2 inch sieve is (1000 / 2000) * 100 = 50%. This indicates a well-graded mix often desirable for stability.
How to Use This Cumulative Weight Retained Calculator
Weigh Your Sieves: Perform your sieve analysis in the lab and record the mass of material retained on each individual sieve.
Enter Data: Input the weight (in grams or kg) into the corresponding fields in the calculator above. Start from the coarsest sieve (top) to the finest (bottom).
Include the Pan: Don't forget to weigh the material in the bottom pan and enter it in the "Pan Weight" field. This is crucial for calculating the total sample weight accurately.
Review Results: The tool instantly calculates the cumulative weight, percent retained, and percent passing.
Analyze the Chart: Use the generated bar chart to visualize the gradation. A smooth curve usually indicates a well-graded aggregate.
Key Factors That Affect Cumulative Weight Results
Several variables can influence the accuracy of your calculation and the resulting material classification:
Sieve Overloading: If too much material is placed on one sieve, particles may not have the opportunity to pass through the openings, artificially increasing the cumulative weight retained on that sieve.
Shaking Duration: Insufficient shaking time means particles that should pass are retained. Excessive shaking can degrade particles, altering the results.
Moisture Content: Damp aggregates tend to clump. Materials should typically be oven-dried before testing to ensure accuracy.
Sieve Condition: Damaged or clogged mesh (blinding) will result in inaccurate retained weights, skewing the cumulative curve.
Sampling Method: The sample must be representative of the stockpile. Poor sampling leads to results that do not reflect the true material properties, potentially leading to structural failures.
Weighing Precision: Using a scale with insufficient precision (e.g., not reading to 0.1g for fine aggregates) introduces rounding errors that propagate through the cumulative summation.
Frequently Asked Questions (FAQ)
What is the difference between "Weight Retained" and "Cumulative Weight Retained"?
Weight retained is the mass found on a single specific sieve. Cumulative weight retained is the running total of that mass plus all mass retained on coarser sieves above it.
Why do I need to calculate Percent Passing?
Percent Passing (100% – % Cumulative Retained) is the standard metric used in gradation charts and construction specifications to determine if a material meets the design requirements.
Does the Pan weight count towards Cumulative Weight Retained?
Technically, the pan collects everything that passes the finest sieve. While it is part of the Total Sample Weight, it is usually not listed as "retained" on a sieve, but rather used to verify the total mass matches the original sample mass.
What if my Total Weight doesn't match my original sample weight?
This indicates material loss (dust flying away) or weighing errors. ASTM standards typically allow a variance of roughly 0.3% max. If the difference is larger, the test should be discarded.
Can I use this for both coarse and fine aggregates?
Yes. The logic for how to calculate cumulative weight retained is identical regardless of particle size. Only the sieve sizes change.
What is Fineness Modulus?
It is a dimensionless number derived from the cumulative percentages retained on standard sieves, used to characterize the average particle size of the aggregate.
Why are the results important for concrete?
The gradation affects the amount of cement paste required. Proper gradation minimizes voids, reducing cost and increasing strength.
How do I handle negative numbers?
Weights cannot be negative. If you see a negative number, check your scale taring or data entry.
Related Tools and Internal Resources
Explore more of our engineering and financial calculation tools: