How this calculator works
Parts describe relative amounts using a common basis. In target-total mode, the result table gives mass in grams and the scalar total has a unit selector. Multiply mode preserves all ratios; increment mode adds the same number to each part and generally changes ratios. Those two modes return dimensionless parts. Use volume ratios only when you deliberately choose a volume basis outside this mass recipe calculation.
Formula
Component mass = total mass x component parts / sum of all parts. Multiplication gives new part = old part x multiplier; increment gives new part = old part + increment.
Worked example
A 2:3:5 recipe scaled to 100 g gives 20 g, 30 g and 50 g. A 1:1 mixture scaled to 2 kg gives 1 kg of each component.
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Frequently asked questions
Can a component have zero parts?
Yes, provided at least one other component has a positive amount.
Does adding one to each part preserve a ratio?
Usually not. For example, 1:2 becomes 2:3.
Can I mix mass and volume parts?
Convert to a common basis first, using densities where needed.