Much of particle science involves Vol fraction of the particles, but we like to formulate by Weight. Here you can enter your relative weights and find both Weight % and Volume %
With 3 components, "Particles", "Ingredients" and "Liquids" you have a convenient way to get a good idea of your (perhaps) complicated formula. The Weights are each in the 0-100 range so you have to do your own quick conversion from whatever units you are actually using. Allowing for real weights in real units would have made the interface too complex.