How do you calculate aggregate blend ratio?

Divide the selected fraction's weight by the total blend weight and multiply by 100. With 35 tons of one fraction in a 100-ton blend, the blend share is 35%.

What does the conversion multiplier do?

It scales the raw ratio into the units you want. At 100 it turns the raw 0.35 ratio into a 35% blend share; set it to 1 if you want the ratio expressed as a decimal fraction instead of a percentage.

How do I check a full blend adds up correctly?

Run each fraction through the calculator against the same total blend weight; the percentages must sum to 100%. If they do not, a bin weight or the total is wrong, and your gradation will be off before the mixer even turns.

Should I use dry or wet aggregate weights?

Use consistent moisture-corrected weights across all fractions. Mixing wet scale weights for one fraction with dry design weights for another skews every blend share, since free moisture can be several percent of mass on fine aggregate.

What is a good blend ratio for an aggregate fraction?

There is no universal good value; the right share is whatever your gradation target and mix design specify for that fraction. The calculator's job is to confirm the actual batch matches that target, not to judge the target itself.

Blend share vs gradation - are they the same thing?

No. Blend share is the weight percentage of one fraction in the mix; gradation is the combined particle-size distribution of all fractions. Correct blend shares are necessary for the target gradation but you still verify the sieve curve separately.

Building Materials Manufacturing calculator

Aggregate Blend Ratio Calculator

Gradation control in concrete and asphalt starts with knowing exactly what share each aggregate fraction contributes to the blend. This calculator divides the weight of one aggregate fraction by the total blend weight and converts it to a percentage, giving the blend share that drives gradation, void content, and binder demand. Batch operators, mix-design technicians, and QC engineers use it to verify that coarse, intermediate, and fine fractions land on their target proportions, to back-calculate a fraction's share from scale weights, and to keep a blend on spec across material deliveries. It is the simplest number on the floor and the easiest to get wrong when bin weights drift.

What this calculator does

Calculate the percentage share of sand, gravel, recycled aggregate, or specialty aggregate in a blend.
a batch plant needs to verify one aggregate fraction against the total blend
It divides the selected aggregate fraction weight by the total blend weight and multiplies by 100 to return that fraction's percentage share of the mix.

Formula used

Raw aggregate blend ratio = selected aggregate fraction in the blend ÷ total aggregate blend weight
Aggregate Blend Ratio = raw ratio × conversion multiplier

Inputs explained

Selected aggregate fraction in the blend:
Total aggregate blend weight:
Percent conversion multiplier:

How to use the result

Use it when verifying a batch against a mix design, back-calculating a fraction's share from scale tickets, or checking gradation after a material change.
It is a weight-share ratio only; it says nothing about gradation curve fit, moisture content, or specific-gravity differences between fractions, which still must be checked separately.

Current U.S. benchmarks

U.S. housing starts run at 1,177k per year (Census, May 2026), down 8.7% from a year earlier, the demand driver for building products.
Steel mill PPI stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. New factory orders are up 2.3% year over year (Census).

Common questions

How do you calculate aggregate blend ratio? Divide the selected fraction's weight by the total blend weight and multiply by 100. With 35 tons of one fraction in a 100-ton blend, the blend share is 35%.
What does the conversion multiplier do? It scales the raw ratio into the units you want. At 100 it turns the raw 0.35 ratio into a 35% blend share; set it to 1 if you want the ratio expressed as a decimal fraction instead of a percentage.
How do I check a full blend adds up correctly? Run each fraction through the calculator against the same total blend weight; the percentages must sum to 100%. If they do not, a bin weight or the total is wrong, and your gradation will be off before the mixer even turns.
Should I use dry or wet aggregate weights? Use consistent moisture-corrected weights across all fractions. Mixing wet scale weights for one fraction with dry design weights for another skews every blend share, since free moisture can be several percent of mass on fine aggregate.
What is a good blend ratio for an aggregate fraction? There is no universal good value; the right share is whatever your gradation target and mix design specify for that fraction. The calculator's job is to confirm the actual batch matches that target, not to judge the target itself.

Last reviewed 2026-05-12.