🏗️ Concrete Mix Calculator
Enter cement amount to auto-calculate sand, gravel, and water quantities
📊 Result Chart
❓ FAQ
How to calculate concrete mix ratio?
Concrete mix is calculated by weight ratio with cement as 1 part. For example, C20 mix ratio is 1:2.5:3.5:0.55, meaning 50kg cement requires 125kg sand, 175kg gravel, and 27.5kg water.
What is the difference between C20, C25, and C30?
C20 ratio 1:2.5:3.5:0.55, suitable for general foundation blinding; C25 ratio 1:2:3:0.5, suitable for slabs and beams; C30 ratio 1:1.5:2.5:0.45, suitable for load-bearing structures and high-strength applications.
What does water-cement ratio mean?
The water-cement ratio is the weight ratio of water to cement. It is a key parameter affecting concrete strength and durability. A lower ratio produces higher strength but reduces workability. Common range is 0.4–0.7.
How to estimate concrete volume?
Concrete volume = total weight ÷ density. Standard concrete density is approximately 2400 kg/m³. For example, total weight 720 kg yields approximately 0.3 m³ of concrete.