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M15 concrete ratio is 1:2:4. It indicates the cement:sand: aggregate ratio. It simply means that if 1 kg cement is used for making Concrete, you should use 2 kg sand and 4 kg aggregate. ( i.e. 1 part cement: 2 parts sand: 4 parts aggregate )
✔ In M15 concrete,
“M” stands for Mix ratio of cement:sand: aggregate & “15 “Stands for Compressive Strength @ 28 Days in N/mm².
✔ M15 Concrete is nominal Concrete that can be skillfully prepared using Indian Standard 10262(2009).
✔ Normally, about 38% of water is required for the complete hydration of Concrete.
As per IS 10262(2019) for nominal mix ( i.e. M10, M15…, M25); the w/c ratio varies from 0.4 to 0.6.
For M15 Concrete, commonly w/c ratio of 0.50 to 0.55 is used.
1. Table1: M15 Concrete Ratio – Overview
Code  Indian Standard 10262(2009). 
Ratio  1:2:4 
Compressive Strength  15 MPa { Note: MPa = N/mm²} 
Uses  Used in generalpurpose work or temporary structures. Mostly used in the construction of parking, landscaping, gardening, etc. 
Grade Category  Normal Grade ( Nominal Mix ) 
Required Water Cement Ratio  a. For highquality concrete works; 0.50 w/c ratio is specified. b. Minimum watercement ratio: 0.50 c. Maximum watercement ratio: 0.55

2. M15 Concrete Ratio Uses
This concrete grade is commonly used for small temporary constructions. Some common uses of the M15 Concrete Ratio are:
✔ Used in the construction of general RCC works ( Such as slabs, beams, columns, etc. )
✔ Used in generalpurpose work or temporary structures.
✔ Mostly used in the construction of parking, landscaping, gardening, etc.
3. Cement Sand Aggregate Calculation For 1 m³ M15 Concrete Ratio
Things To Know!! Density of Cement = 1440 kg/m^{3} Density of Sand = 14501500 Kg/m^{3} Density of Aggregate = 14501550 Kg/m^{3} Weight of Cement in 1 Bag = 50 Kg Volume of 1 Bag of Cement in Cubic meter = 0.03472 m^{3} 
Now, Taking
Grade of Concrete = M15 Concrete
Mix Ratio = 1:2:4
Total sum of ratio =1+2+4 =7
Wet volume of Concrete = 1 m^{3}.
To get dry volume, wet volume increased by 54%
Dry volume of concrete = 1 + 0.54 = 1.54 m³
i. Cement Quantity Calculation
Quantity of cement = (Own Ratio/ Total sum of ratio) * Dry Volume
= ( 1/7 ) * 1.54
= 0.22 m³
Cement in kg = volume of cement * density of cement
= 0.22 * 1440
= 316.8 kg
ii. Sand Quantity Calculation
Quantity of sand = (Own Ratio/ Total sum of ratio) * Dry Volume
= ( 2/7 ) * 1.54
= 0.44 m³
iii. Aggregate Quantity Calculation
Quantity of aggregate = (Own Ratio/ Total sum of ratio) * Dry Volume
= ( 4/7 ) * 1.54
= 0.88 m³
iv. Water Calculation
For inferiorquality concrete: W/C ratio = 0.55
For superiorquality concrete: W/C ratio = 0.50
Minimum amount of water required per m³ = 0.50 * 316.8 = 158.4 kg
Maximum amount of water required per m³ = 0.55 * 316.8 = 174.24 kg
4. References 
Read Also: Grades of Concrete 
Verified Article By Er. Madhu Krishna Poudel 