Concentrated Syrup Dilution Calculator
Written by Thierno Sadou Diallo, formula verified per our methodology • Last checked on 9/9/2026
To dilute a concentrate, divide the desired total volume by (1 + the dilution ratio) to get the amount of concentrate, with the rest being water. For 1 L at a 1:4 ratio, you need 200 mL of concentrate and 800 mL of water.
Explanation
Syrups and concentrated juices generally state a dilution ratio on their label, expressed in "parts": a 1:4 ratio means 1 part concentrate to 4 parts water, or 5 parts total, of which 1/5 is concentrate and 4/5 is water. This calculator starts from the total volume you want to obtain, and directly derives the amounts of concentrate and water to mix, without having to do this proportion calculation by hand. The formula rests on the fact that the concentrate always represents 1 part out of (1 + ratio) total parts: with a ratio of 4, the concentrate represents 1/5 of the final volume, or 20%. The higher the ratio, the more strongly diluted the syrup (less concentrate per final volume); a ratio of 1 (1:1 dilution) gives an equal-parts mix, closer to a typical "ready to dilute" juice than a concentrated syrup. This same proportion principle applies to other diluted culinary preparations (vinaigrettes, marinades, some cocktails) whenever a mixing ratio is known. To convert a volume to a weight depending on the ingredient rather than a dilution, see our cups to grams conversion calculator; for a coffee-to-water ratio rather than a syrup, our coffee-to-water ratio calculator.
Example: 1 L at a 1:4 ratio
Inputs
Desired total volume: 1000 mL. Dilution ratio: 4 (1:4).
Calculation
Concentrate = 1000 ÷ (1 + 4) = 1000 ÷ 5 = 200 mL. Water = 1000 − 200 = 800 mL.
Result
For 1 L of diluted syrup, use 200 mL of concentrate and 800 mL of water.
Frequently asked questions
How do you read the dilution ratio shown on a label?
A ratio like "1:4" or "1 to 4" reads as 1 part concentrate to 4 parts water. The first value (1) always corresponds to the concentrate in this calculator; only enter the second value (4) in the "dilution ratio" field. If the label states a different ratio, like 1:3 or 1:6, simply adjust this value.
Does the result change if I prepare a larger quantity?
No, the proportions stay strictly identical regardless of the total volume: doubling the total volume doubles both the amount of concentrate and water, in the same proportions. This calculator automatically adapts to whatever final volume you enter.
Can I use this calculator for preparations other than syrup?
Yes, the proportion principle (1 part concentrate to X parts diluent) applies the same way to a concentrated juice to dilute, a vinaigrette (oil to vinegar), or any mix defined by a simple ratio between two liquid ingredients.