Bottle Size by Dose: How Many ml a Routine Actually Uses
Enter the dose per use, uses per day and days the pack should last; the calculator returns the bottle size and the annual volume.
Designed by Joe Joo · 8PCK, Shantou
A 1.2 ml pump twice a day for 60 days is 144 ml — so the pack is 150 ml, not the 100 ml most brands start with.
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
- Total product = dose × uses per day × days of supply.
- Take the smallest stock bottle above that total.
- Annual volume = units × capacity — the number that decides whether a new mould is justified.
Assumptions. Pump output is constant within tolerance; a viscous product delivers slightly less per stroke than water.
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. Dose is a label claim. If the label says 0.3 ml, the pump must be specified and tested to deliver 0.3 ml.
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
Dose, frequency and run length decide the smallest stock size that works.
| Input | Total product | Stock size | Days per unit | Annual volume |
|---|---|---|---|---|
| 0.5 ml × 2/day × 30 days | 30 ml | 30 ml | 30 days | 600 L |
| 1 ml × 1/day × 30 days | 30 ml | 30 ml | 30 days | 1,500 L |
| 2 ml × 1/day × 60 days | 120 ml | 120 ml | 60 days | 1,200 L |
Dose Decides the Bottle, Not the Brief
A 1.2 ml pump twice a day for 60 days needs 144 ml, so the pack is 150 ml — not the 100 ml a brand usually starts with. This is the single most common sizing error in skincare.
Why Annual Volume Matters
Units × capacity sets the resin order and whether a new mould is justified. Below 20,000 units a year, a stock shape is almost always the right answer.
Questions About This Tool
What dose should I use?
Face serum 0.5–1.2 ml; body lotion 2.0 ml; cleanser 1.0–1.5 ml. Ask the pump supplier for the stroke.
Does the pump output stay constant?
Within tolerance; a viscous product delivers less per stroke than water.
What if the result is between sizes?
Take the larger size — an under-filled pack reads short on shelf.
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.