Dilution Calculator: Concentrate, Water and Cost per Bottle
Enter the dilution ratio and the bottle size; the calculator returns concentrate per bottle, water, cost per bottle and bottles per litre.
Designed by Joe Joo · 8PCK, Shantou
A 1:10 concentrate in a 250 ml bottle makes 2.75 litres of ready-to-use product — which changes the container, the carton and the freight per litre of use.
Want a Person to Check It?
Send the numbers and we reply with a written quotation, lead time and a sample plan — usually within a few hours, Mon–Sat.
The Formula, the Assumptions, and Where It Stops
- Concentrate per bottle = bottle volume × a ÷ (a + b), for a ratio of a:b.
- Water per bottle = bottle volume − concentrate.
- Cost per bottle = concentrate cost per litre × concentrate volume.
Assumptions. Ratios are volumetric. A surfactant system may need a different ratio than a generic guide suggests.
Standards we work to. ISO 9001:2015 (quality system, cert PCC85724Q01277R1S) · EU 10/2011 (plastic food-contact, migration report E2032) · RoHS (PE B-R01612E2033, PET B-R201133464) · ISO 4180 (packaging for transport). The calculator is a planning tool: the approved drawing and the migration report decide the final specification.
Where it does not apply. It does not validate the formula — dilution stability is a lab question, not a packaging one.
Send the Numbers, Get a Person
Reply with the result above and we come back with a written quotation, packing data and a sample plan — within one business day.
Worked examples
Ready-to-use dilution: the concentrate share sets both the fill volume and the cost per bottle.
| Input | Concentrate | Water | Cost per bottle | Bottles per litre |
|---|---|---|---|---|
| 1:10 in a 750 ml bottle at $6/L | 68.2 ml | 682 ml | $0.409 | 14 |
| 1:4 in a 500 ml bottle at $9/L | 100.0 ml | 400 ml | $0.900 | 10 |
| 1:20 in a 1000 ml bottle at $4/L | 47.6 ml | 952 ml | $0.190 | 21 |
Also Worth a Minute
Why Refill Concentrate Changes the Pack
A 1:10 concentrate sold in a 250 ml bottle makes 2.75 litres of ready-to-use cleaner. That changes both the container (small, thick-wall, measuring cap) and the shipping cost per litre of use.
The Bottle Still Has to Survive the Chemistry
Alkaline and solvent concentrates need HDPE and a specified trigger gasket; PET is only for mild, near-neutral formulas.
Questions About This Tool
What ratio should I use?
Typical household cleaners run 1:5 to 1:20; the label and the surfactant system decide.
Which bottle for concentrate?
250–500 ml HDPE with a measuring cap and a 38 mm neck.
Can the trigger handle it?
Specify the gasket material and test with the real concentrate, not water.
Didn't Solve It?
Tell us what you are trying to pack and we will tell you what fits, what it costs and how long it takes. No forms if you would rather just message.