Is body oil expensive? How to work out the real cost per use
Short answer: compare price per millilitre and per application, not price per bottle. Body oil is used in far smaller amounts than lotion, so the number on the bottle almost always overstates what it costs you to use.
The three numbers you need
- Volume. In millilitres. If a product does not print it anywhere, you cannot compare it - and some body oils genuinely do not.
- Price per ml. Price divided by volume.
- Amount per use. For a full body, most people land somewhere between 10 and 20 drops - roughly one to one and a half droppers. A drop is about 0.05 ml, so a full body is about 0.5 to 1 ml.
Multiply and you get cost per application, which is the number that actually matters.
Worked example
| Saltysleep Crystal Body Oil | |
|---|---|
| Price | $39.99 |
| Volume | 100 ml |
| Price per ml | about $0.40 |
| Full body per use | 0.5 to 1 ml |
| Cost per full-body application | about 20 to 40 cents |
| Applications per bottle | roughly 100 to 200 |
| Nightly, whole body | about three to six months |
Used only on dry areas - elbows, knees, shins, hands - a bottle lasts considerably longer than that.
Two things that quietly double your cost
Applying to dry skin. On fully dry skin the same amount does not spread, so people use two or three times as much and still feel like it did not absorb. On damp skin a few drops go noticeably further. This is the single biggest difference between people who say a bottle lasts six months and people who say they went through it in six weeks.
Buying a travel size for daily full-body use. A 15 ml bottle holds roughly 15 to 30 full-body applications. It is a good way to try a scent or to keep one in a bag, and a poor way to moisturise your whole body every night.
Watch for missing volume
When you are comparing, check that every product on your list prints its volume. A product that does not can look competitive on price and be the most expensive per use on the list. If you cannot find the millilitres, you are not comparing - you are guessing.
Comparing against lotion
Lotion is cheaper per bottle and used in much larger amounts, so per application the gap is narrower than it looks. The fairer comparison is per night of comfortable skin. If a lotion needs reapplying and an oil does not, count the reapplications.
Where Saltysleep Crystal Body Oil fits
Saltysleep Crystal Body Oil is $39.99 for 100 ml / 3.38 fl oz in a dark glass dropper bottle. It contains retinol, so use it at night, and not during pregnancy or while breastfeeding. Made in Korea. Unopened it keeps for three years from the date printed on the carton; once opened, use within 12 months.