What you really mean is concrete. Cement is only one ingredient in concrete. Here is a recipe.
3 parts aggregate like gravel, 2 parts sand, 1 part cement (Portland Cement) and enough water to make is feel like the consistency of peanut butter, pretty much 1 part water. But the water is the tricky part, you do not want too little (though less is more) and most assuredly you do not want too much as too much water will weaken the concrete. Experience rules. Oh no taste tests to this recipe, wouldn't be good.