Predict Concrete Strength & Carbon

Set the mix design and see the predicted compressive strength, its EN 206 class, what drives it, and the mix's embodied carbon. Everything is calculated in your browser.

Mix Design Parameters

350kg/m³
Primary binder — drives early strength100–700
0kg/m³
Latent hydraulic binder — boosts long-term strength0–360
0kg/m³
Pozzolanic filler — reduces heat of hydration0–200
175kg/m³
Lower w/c ratio → denser paste → higher strength120–250
6kg/m³
Maintains workability at low water content0–32
1040kg/m³
Structural skeleton — crushed stone or gravel800–1150
755kg/m³
Sand — fills voids between coarse particles550–1000
28days
28 days = standard reference per EN 2061–365

Predicted compressive strength

39.9MPa
C30/37Normal Strength

w/c

0.50

≤0.45 durable

w/b

0.50

= w/c

Age

28d

standard

Embodied carbon (A1–A3)

344kg CO₂e/m³
8.6kg CO₂e per MPa
Cement319.2 kg · 93%
Superplasticizer11.3 kg · 3%
Coarse Aggregate7.8 kg · 2%
Fine Aggregate5.7 kg · 2%
Water0.1 kg · 0%

Generic emission factors (mostly ICE v3.0), cradle to gate, concrete only. How it's calculated

What drives this prediction (SHAP)

How each input moves the prediction from the dataset average (35.3 MPa) to this mix (39.9 MPa).

raises strengthlowers strength
Water/Binder Ratio0.500
−4.10
Water/Cement Ratio0.500
+2.65
Total Binder350 kg/m³
−2.51
Curing Age28 days
+2.20
Coarse Aggregate1040 kg/m³
+1.34
Superplasticizer6 kg/m³
+1.09
Water175 kg/m³
+1.00
Cement350 kg/m³
+1.00
Fine/Coarse Agg. Ratio0.726
+0.90
Fly Ash0 kg/m³
+0.59
Fine Aggregate755 kg/m³
+0.55
Fly Ash/Cement Ratio0.000
+0.52
Slag/Cement Ratio0.000
−0.38
Blast Furnace Slag0 kg/m³
−0.31

Compared with a Portland-cement-only mix

Reference: the same mix with all binder as Portland cement (slag and fly ash replaced 1:1), so the binder content and w/b ratio stay the same.

This mix uses only Portland cement, so it is its own reference. Add slag or fly ash to see how much carbon they save and what they do to the predicted strength.

EN 206 grade reference

C8–C20Low Strength (fck ≤ 20 MPa)
C25–C35Normal Structural (fck 25–35)
C40–C55High Strength (fck 40–55)
C60+Ultra-High Strength (fck ≥ 60)

Class estimated from fck = predicted mean − 8 MPa (EN 1992-1-1).