Concrete Mix Proportions Calculator
The concrete mix proportions calculator helps you determine the correct ratios of cement, sand, gravel, and water for preparing structural and residential concrete mixes.
Cement strength: CEM I/II 42.5 (M500 standard)
На 1 мішок цементу (25 кг)
Cement (M500)
25 kg
Washed river sand
70 kg
Crushed stone (5-20mm)
105 kg
Clean water
16 L
Mixer drum loading best practices
How to use
- Select target concrete strength class (M100 to M400).
- Choose cement grade (CEM I / II 42.5 or 52.5 / M400 or M500).
- Enter total finished concrete volume in m³ or calculate per single cement bag.
- Choose measurement units: kilograms, 10-liter buckets, or shovelfuls.
- Review the precise weight and volumetric recipe for mixer loading.
What Does the Concrete Mix Calculator Compute?
Cement requirement: weight in kilograms and standard 25 kg / 50 kg bag count.
Sand volume & weight: clean concrete sand proportion.
Gravel volume & weight: coarse aggregate requirement (5-20 mm).
Water volume: recommended water quantity based on optimal water-cement ratio.
Standard Mixing Proportions
For standard M200 grade concrete using M500 cement, the weight ratio is 1 : 2.8 : 4.4 (cement : sand : gravel).
For foundations and structural beams, M250 (1 : 2.1 : 3.9) or M300 (1 : 1.9 : 3.7) provides increased durability.
Frequently Asked Questions
What is the standard concrete mixing ratio?
A common general-purpose ratio for M200 concrete with M500 cement is 1 part cement, 2.8 parts sand, and 4.4 parts crushed stone.
How many buckets of sand and stone per 25 kg cement bag?
For 25 kg of cement, use approximately 5 buckets of sand (10 L each) and 8 buckets of gravel.
How much water should be added?
Maintain a water-to-cement ratio around 0.5 to 0.6 (approx. 12 to 15 liters per 25 kg cement bag).
Why avoid excess mixing water?
Excess water creates internal pores during curing, drastically weakening compressive strength and frost resistance.
What aggregate size is best?
Crushed stone or gravel graded 5 to 20 mm is standard for structural residential concrete.
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