Routine basics
How much cream to use, in fingertip units
Most people under-apply prescription creams by a wide margin. There is a standard measure that fixes it, and it takes ten seconds to learn.
- Fingertip to first creaseThat is one unit, about half a gram
- Face and neck: 2.5 unitsOne arm takes 3, one leg takes 6
- Check the tubeLasting far too long means too little
On this pageWhat one fingertip unit is5
Quick answer
The bottom line
One fingertip unit is the cream squeezed from a standard nozzle along an adult fingertip, and it covers roughly the area of two flat adult hands. Use it to check whether you are applying enough, because under-application is the most common reason a prescription cream appears not to work. A whole adult face and neck takes about two and a half units, and one arm about three. If a tube runs a lot longer than the pharmacy expected, that is a signal to check your amount before concluding the treatment failed.
At a glance
Three things worth remembering
- Sunscreen has its own measure: about a teaspoon for face and neck, and around 30 mL for a whole adult body.[3]
Section 01
What one fingertip unit is
Squeeze cream from a standard tube nozzle along the pad of an adult index finger, from the tip to the first crease. That line is one fingertip unit, and it weighs roughly half a gram. It covers about the area of two adult hands laid flat, fingers together.[1][2]
The measure exists because "apply a thin layer" means nothing consistent. Two people reading the same instruction routinely apply amounts that differ several-fold, and the person applying less is usually the one who concludes their treatment does not work.[4][1]
Section 02
How many units each area takes
Children need less, scaled to size rather than to age alone, and a prescriber or pharmacist will give the figure for a specific child. The pattern to notice is how much a whole body actually takes: treating trunk and limbs properly uses around twenty-eight units, or about fourteen grams, in a single application.[1][5]
| Area | Units | Roughly |
|---|---|---|
| Face and neck | 2.5 | A short line across two fingers[1] |
| One hand, front and back | 1 | One fingertip line[1] |
| One arm | 3 | Three fingertip lines[1] |
| One leg | 6 | Six fingertip lines[1] |
| Chest and stomach | 7 | Seven fingertip lines[1] |
| Back and buttocks | 7 | Seven fingertip lines[1] |
Section 03
The tube test
Work backwards from how fast the tube empties. If you were given a 30 gram tube for twice-daily use on both arms, that is about six units a time, three grams a day, and the tube should last around ten days. A tube like that still half full after a month means you have been applying roughly a third of the intended amount.[1][4]
This is the single most useful check before deciding a prescription failed. Clinicians see it constantly: a treatment declared useless was never actually tested at the amount it was prescribed at.[4][5]
Section 04
Why under-applying is so common
- Fear of steroids. Worry about thinning skin leads people to use far less than prescribed for far longer, which treats the flare poorly and prolongs it.[1][5]
- Cost. An expensive product gets rationed, and rationing turns a working treatment into a failing one.[4]
- The phrase "thin layer", which most people interpret as far thinner than intended.[1]
- Time. Properly covering a limb takes longer than a quick smear, and evening tiredness quietly reduces the dose.[4][5]
Section 05
Sunscreen has its own measure
Sunscreen is not dosed in fingertip units, because it needs a much thicker film than a treatment cream. The tested amount works out at roughly a teaspoon for the face and neck and about 30 mL — a shot glass — for a whole adult body, reapplied every two hours outdoors.[3]
Most people apply between a quarter and a half of that, which is why the protection people actually get is well below the number on the bottle. If a facial sunscreen lasts you six months, you are not using a teaspoon.[3][4]
Your next step
Turn this into a practical plan
Choose the guide that best matches what you see. Each one starts with what to try, how long to wait and when to get help.