Mixing Ratio Calculator
Calculate mixing ratios, dilution factors, and component masses for mixtures. Useful for chemistry labs, industrial mixing, and solution preparation.
Mass of the first component
Mass of the second component
Total mass of mixture to prepare
Enter as ratio (1:4) or decimal (0.25)
Total number of parts in the mixture
Number of parts for the first component
Concentration of stock solution
What is a mixing ratio?
A mixing ratio expresses the proportion of components in a mixture. It can be expressed as: (1) Mass ratio - mass of component A to mass of component B (e.g., 1:4 means 1g A per 4g B), (2) Volume ratio - volumes of components (common for liquids), (3) Molar ratio - moles of each component (used in chemistry reactions), (4) Parts - e.g., 5 parts A to 3 parts B. The ratio determines the final concentration or composition of the mixture.
How do I calculate the mixing ratio from masses?
For masses m1 and m2: ratio = m1/m2. For percentage composition: % component = (mass of component / total mass) × 100. Example: If mixing 30g salt with 170g water: ratio = 30/170 = 0.176:1, salt percentage = (30/200) × 100 = 15%. The ratio can also be expressed as 1:X where X = m2/m1.
What is a dilution factor?
Dilution factor (DF) is the ratio of initial concentration to final concentration: DF = C_stock / C_final. It tells you how much the stock solution is diluted. A DF of 10 means the stock is diluted 10-fold (1 part stock + 9 parts solvent). Formula: C₁V₁ = C₂V₂, where C₁ = stock concentration, V₁ = stock volume, C₂ = final concentration, V₂ = final volume. If diluting by mass, use C₁M_stock = C₂M_total.
How do I make a specific concentration from a stock solution?
Use the dilution formula: Mass_stock = (Target% / Stock%) × Total_mass_needed. For example, to make 200g of 5% solution from 50% stock: Mass_stock = (5/50) × 200 = 20g stock + 180g solvent. The ratio is 1:9 (stock:solvent). Always add solvent to concentrate, not the other way, to avoid localized high concentrations.
What is the difference between mixing by mass vs. volume?
Mixing by mass (weight) is more accurate for solids and gives precise composition regardless of temperature. Mixing by volume is common for liquids but can be temperature-dependent. For precise laboratory work, always use mass. For industrial processes where exact ratios are less critical, volume is faster. For gas mixing, ratios are typically by volume. The choice affects the final concentration accuracy.
What are common mixing ratios in industry?
Common ratios: (1) Epoxy resin: typically 1:1 to 2:1 resin to hardener by weight, (2) Concrete: 1:2:3 (cement:sand:aggregate) to 1:1.5:3, (3) Antifreeze: 50:50 water:glycol (50% concentration), (4) Hydroponic nutrients: varies by plant type, typically 100-200 ppm N, (5) Soil mixes: often 1:1:1 topsoil:peat:perlite. Always verify specific product requirements.