M15 should not be used in structural concrete. In addition, it is better to mix design instead of using the nominal mixes mentioned by others!
What is the ratio of M15 concrete?
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1:2:4 is all about the proportion of the concrete while M15 is the compressive strength of whatever mix you use. In this case (15 N/mm2)
M15 ratio is 1:2:4 in which one part is cement, 2 part is sand and 4 part is aggregate mix with water
Nominal mix for m15
Dry volume for concrete 1.51
Cement 315 kg ppc
Sand .43 m³ × density of sand
Aggregate .86m³ × density of aggregate
20mm,10mm ratio use as workable trial mix
1:2:4 (cement:fine aggregate:coarse aggregate)