1:1.5:3 Concrete Mix Ratio Calculator & Proportions
Verified material batching recipe for a 1:1.5:3 concrete mix. Calculate cement bags, sand weight, gravel tonnage, water requirements, and on-site bucket batching instructions.
Custom Batch Volume Estimator
Calculate exact ingredient weight and volumes for any required cubic yardage or cubic meters.
Batch Quantities to Produce 1 Cubic Yard (1:1.5:3 Concrete Mix Ratio)
Concrete ingredients must be measured accurately to achieve design compressive strength. The table below lists standard batch proportions for 1 cubic yard (27 cubic feet) of concrete:
| Material Component | Volumetric Proportion | Weight per Cubic Yard | Unit / Container Count | Specification Note |
|---|---|---|---|---|
| Portland Cement | 1 part | 705 lbs | 7.5 bags (94 lb) | ASTM C150 Type I or II standard grey cement |
| Concrete Sand (Fine) | 1.5 parts | 1150 lbs | 0.57 tons | Clean, washed masonry or concrete sand (ASTM C33) |
| Coarse Gravel / Stone | 3 parts | 2100 lbs | 1.05 tons | Crushed #57 stone or gravel (3/4″ nominal size) |
| Mixing Water | Ratio: 0.44 | 300 lbs | 36 gallons | Clean, drinkable potable water |
On-Site Bucket Batching Recipe (5-Gallon Pails)
When mixing small batches manually on-site with a portable drum mixer or wheelbarrow, volumetric pails provide an easy method to maintain strict ratios:
Mixing Sequence: Add 75% of the water and all the coarse stone first to lubricate the drum. Next, add the Portland cement and mix for 1 minute until a smooth slurry forms. Finally, add the sand and the remaining water, mixing continuously for 3–5 minutes until uniform color and consistency are achieved.
Best Applications for a 1:1.5:3 Concrete Mix Ratio
- Load-bearing structural columns, beams, and lintels
- Heavy-duty commercial foundations, crane pads, and industrial slabs
- Waterproof retaining walls and below-grade stem walls
- Precast concrete beams and structural stairs
Frequently Asked Questions: 1:1.5:3 Concrete Mix Ratio
What is a 1:1.5:3 concrete mix ratio?
A 1:1.5:3 concrete mix ratio specifies volumetric proportions of 1 part Portland cement, 1.5 parts clean sand (fine aggregate), and 3 parts gravel or crushed stone (coarse aggregate). It produces a design compressive strength of approximately 3,500 – 4,000 PSI (24 – 28 MPa) after 28 days of standard curing.
How many bags of cement for 1 cubic yard of 1:1.5:3 concrete?
To batch 1 cubic yard of 1:1.5:3 concrete, you will need 7.5 standard 94 lb bags of Portland cement, approximately 1150 lbs (undefined tons) of concrete sand, 2100 lbs (undefined tons) of coarse gravel, and 36 gallons of clean potable water.
How do I batch 1:1.5:3 concrete on-site using buckets?
For on-site manual batching using standard 5-gallon buckets: for every 1 bucket (or 1 bag) of Portland cement, add 1.5 buckets of washed sand, 3 buckets of gravel, and approximately undefined gallons (about NaN buckets) of water. Maintain a stiff, workable plastic consistency (3–4 inch slump) and avoid overwatering, which drastically reduces concrete strength.