Supply calculator

Work out how long a jar actually lasts in your everyday home care routine

Tell it the size of the container, how much you use each time, and how many times a day. It returns a plain number of days and a reorder date — no price, because nothing here is a checkout.

Enter your numbers

Container size 15–250

50 ml or g

The volume or weight printed on the jar or bottle — a night cream jar is 50ml, a dropper bottle of facial oil is 30ml.

Amount per use 0.1–10

1 ml or g

A dab of night cream is roughly 1ml. Four drops of the rosehip facial oil is closer to 0.4ml. A handful of the unscented body oil runs 3 to 5ml.

Uses per day 1–4

2 per day

Most creams and cleansers are twice daily, morning and night. Bath oil is usually once.

Load a typical product

Estimated supply

50 days of supply

Reorder around —

days = size ÷ (amount × uses)

This is a plain arithmetic estimate from the three numbers above, not a promise of exactly how your skin will use the product — some nights it's more, some it's less.

No price is calculated here. Every quote for a jar, tube or set comes from a conversation, on the contact page or by phone.

The live calculator needs JavaScript. Do the arithmetic by hand instead: divide the container size in millilitres or grams by the amount you use per application, then divide again by how many times a day you use it. A 50ml jar used at 1ml, twice a day, lasts 50 ÷ (1 × 2) = 25 days.

The formula, stated plainly

days = size ÷ (amount × uses)

Size is the container's stated volume or weight in millilitres or grams. Amount is how much you use per application, in the same unit. Uses is how many times a day you apply it. Divide size by the product of the other two and you get the number of days the container will last, assuming a steady routine.

Add that many days to today's date and you have a plain reorder date — the point at which the jar is realistically empty, not a marketing subscription cycle.

Worked example: A 150ml Bath Oil Pour, used once a day at roughly 5ml a pour: 150 ÷ (5 × 1) = 30 days of supply.
A second example: A 200ml bottle of Micellar Water, used twice a day at about 3ml a pass on a cotton pad: 200 ÷ (3 × 2) ≈ 33 days.

A dropper releasing a measured dose of oil into a small dish — What "amount per use" looks like for a dropper product.

What this doesn't account for

The calculator assumes a steady routine and a container that dispenses cleanly to the last bit, which is optimistic — a cream jar usually leaves a thin film behind that's hard to scrape out, and a pump bottle can trap a few millilitres near the bottom. Treat the result as an upper estimate, not a guarantee, and expect to reorder a few days earlier than the date shown.

It also doesn't know your skin. Someone with drier skin in Texas winter air might use closer to double the amount of Daily Barrier Cream than someone in a humid month, which halves the days of supply for the same jar. If a number here looks off after a week of real use, trust the week over the arithmetic.

The inputs are capped — 15 to 250 for size, 0.1 to 10 for amount, 1 to 4 for uses per day — because outside those ranges the result stops describing any home skincare set we actually carry. If your real numbers sit outside that range, call and we'll do the arithmetic with you on the phone.

Once you know roughly how long a jar lasts, the next step is finding out what it costs and whether it's the right formula for your skin.

Send a product inquiry