Dilution Ratio Calculator
Work out how much concentrate and water you need for any dilution ratio and final volume.
Formula and sources updated · Data sources · 1View algorithm, constants and default inputs (JSON)
About this calculator
A dilution ratio of 1:10 means one part concentrate to ten parts water, giving eleven parts in total. That is different from a 10% solution, which is one part in ten overall — a distinction that matters for cleaning chemicals and fertilisers.
Worked example
calculated with the default values below
Concentrate parts 1 · Water parts 10 · Final volume needed 5 L Concentrate needed 0.455 L · Water needed 4.545 L · Concentrate share of the mix 9.09 % · Total parts 11
Method and assumptions
C = V × A ÷ (A + B); W = V − C; P = A ÷ (A + B) × 100 Total parts = A+B; P is the concentrate percentage. Mixing A parts concentrate with B parts water gives the stated split of V. A dilution ratio of 1:10 means one part concentrate to ten parts water, giving eleven parts in total. That is different from a 10% solution, which is one part in ten overall — a distinction that matters for cleaning chemicals and fertilisers. Use the cited guidance and your own measurements, bills or product specifications to choose inputs. Sample defaults are not current local data.
Data sources
Use the cited guidance and your own measurements, bills or product specifications to choose inputs. Sample defaults are not current local data.
Disclaimer
These calculators provide planning estimates only. Building codes, wiring regulations and safety requirements differ by country and change over time, and nothing here replaces a licensed professional or a permit. For structural, electrical or gas work, follow local code and have the installation inspected.
Implementation source
This record describes the implementation used by this page. It is not independent validation. External references, when available, support only the stated formula or definition; estimates and custom rules retain their own assumptions.
Formula and variables
C = V × A ÷ (A + B); W = V − C; P = A ÷ (A + B) × 100
- A
- parts of concentrate
- B
- parts of water
- V
- total volume
- C
- concentrate volume
- W
- water volume
- P
- concentrate percentage
Total parts = A+B; P is the concentrate percentage. Mixing A parts concentrate with B parts water gives the stated split of V.
Frequently asked questions
Why is a 1:10 ratio not the same as a ten percent mix?
The tool treats the ratio as concentrate parts to water parts, so 1:10 means one part concentrate plus ten parts water for eleven parts total, and it computes concentrate as final volume × 1/11. A ten percent solution instead means one part in ten overall, so the concentrate share is 9.1% here versus 10% there. With the default 5 L at 1:10 you need about 0.45 L of concentrate, whereas a true 10% mix would take 0.5 L.
Which inputs and limits apply to Dilution Ratio Calculator?
Use the units shown beside each field. These are form limits, not recommended settings. Concentrate parts: 0–1,000; Water parts: 0–10,000; Final volume needed: 0.01–10,000 L C = V × A ÷ (A + B); W = V − C; P = A ÷ (A + B) × 100 Total parts = A+B; P is the concentrate percentage. Mixing A parts concentrate with B parts water gives the stated split of V. A dilution ratio of 1:10 means one part concentrate to ten parts water, giving eleven parts in total. That is different from a 10% solution, which is one part in ten overall — a distinction that matters for cleaning chemicals and fertilisers. Use the cited guidance and your own measurements, bills or product specifications to choose inputs. Sample defaults are not current local data.
What is a complete worked example for Concentrate parts = 1; Water parts = 10?
Inputs: Concentrate parts = 1; Water parts = 10; Final volume needed = 5 L. Calculation: C = V × A ÷ (A + B); W = V − C; P = A ÷ (A + B) × 100. Results: Concentrate needed = 0.455 L; Water needed = 4.545 L; Concentrate share of the mix = 9.09 %; Total parts = 11.