If you are starting from nothing, a cheap broad-spectrum SPF 30 you will apply generously every morning beats anything more sophisticated used sparingly. Sunscreen is the one product where the dose decides the result, and cost is the main thing standing between people and an adequate dose. The upgrade worth making is not a higher number — it is broad-spectrum UVA coverage and a texture pleasant enough that reapplication happens. And there is a real overkill tier: multi-step sun systems, powder reapplication built into a makeup routine, and premium formulas at a price that quietly makes you ration them. Where you should sit depends entirely on whether you currently wear any at all.
The verdict, up front
| Stage | Product | ~Price | Who it’s for |
|---|---|---|---|
| Start | A drugstore broad-spectrum SPF 30-50 | ~$12-18 | Anyone not currently wearing sunscreen daily. Cheap enough to use at the tested dose, which is the entire point |
| Upgrade | A modern high-UVA filter fluid | ~$25-40 | Anyone with pigmentation, melasma, rosacea or on a photosensitizing medication, where UVA coverage does the work |
| Overkill | Powder SPF as your reapplication system | ~$35-45 | Genuinely overkill because almost nobody applies enough powder to reach the labelled protection. A second product solving a problem a bigger bottle solves better |
Quick facts
| Detail | The short version |
|---|---|
| Tested dose | About 2mg per square centimetre — roughly a quarter-teaspoon for the face alone |
| Typical real dose | Studies repeatedly find a quarter to half of that, which drops real protection sharply |
| SPF measures | UVB, and therefore burning. It says nothing directly about UVA |
| UVA matters for | Pigment, photoageing, and most drug-related photosensitivity |
| Reapply | Every two hours outdoors, and after swimming or heavy sweating |
| Indoors by a window | Glass blocks most UVB and lets UVA through |
Where to start, and why cheap is the right answer
The first sunscreen’s only job is to become a habit. Everything else follows from daily use, and nothing follows from an excellent product used twice a week.
At a quarter-teaspoon per face per day, a bottle disappears in about six weeks. That arithmetic is why price matters more than it seems: a bottle you would rather not finish is a bottle you under-apply, and under-application is the single most common reason sunscreen disappoints in real life.
So the starting brief is narrow. Broad-spectrum. SPF 30 or above. A texture you do not resent. A price you would happily repeat monthly. Brand and formulation sophistication are irrelevant at this stage.
When the upgrade is worth it
The upgrade is not a higher SPF. Past SPF 50 the additional UVB protection is marginal and the number mostly buys confidence.
The upgrade that changes outcomes is UVA. Modern filters available in Europe and Asia — and increasingly in products sold internationally — deliver considerably better long-wavelength UVA coverage than older formulations. If your concern is pigment, melasma, redness or photoageing rather than burning, that is the axis that matters.
The second upgrade worth paying for is texture, because it decides reapplication. A fluid that layers under makeup without pilling, or a tinted formula that replaces a step, gets reapplied. A thick white cream does not.
Anyone on a photosensitizing prescription belongs in this tier rather than the first one, for reasons set out in the guide to those medications.
Why powder reapplication is the overkill tier
Naming something overkill requires a real reason, and this one has a specific one rather than being a straw man.
Powder SPF is tested at the same standard as any other sunscreen, which means the labelled protection assumes the same weight of product on the skin. Reaching that with a brush over makeup would take far more powder than anyone applies — the amount that would look like face powder rather than a light dusting. So the number on the compact and the protection on your face are unlikely to be the same thing.
It is not useless. As a top-up over an already-applied sunscreen it adds something, and it is better than skipping reapplication entirely. But as a system, it is a second purchase solving a problem that a larger bottle and a hat solve more reliably and for less.
The same logic applies to multi-step sun routines — a primer, a base and a setting product each claiming SPF. Layered protection does not add up arithmetically, and the complexity mostly buys the feeling of thoroughness.
The two-finger rule, and why it exists
Measuring a quarter-teaspoon every morning is not a habit anyone sustains, so dermatologists use proxies. The best known is two fingers: a line of product squeezed along the length of the index and middle fingers, applied to face and neck. Another is the half-teaspoon shared between face and neck together.
Both consistently produce more product than people apply by instinct, which is the point. When someone first measures it out, the usual reaction is that it seems like far too much — and that reaction is the diagnosis. It looks like too much because the normal amount is too little.
Do it properly for a week and it recalibrates. After that you can go back to eyeballing it, because your eye has been reset. This one exercise does more for real protection than moving up a tier ever will.
Reapplication, honestly
Every two hours is the instruction and almost nobody indoors follows it, so it helps to be clear about when it truly matters and when it does not.
It matters outdoors, and it matters after swimming, heavy sweating or towelling. Sunscreen is removed physically far more than it degrades chemically, so the reapplication rule is mostly about what has rubbed off rather than what has broken down.
For a day spent indoors away from windows, a single morning application is doing most of what it will do. Being realistic about this is better than an instruction so onerous it gets abandoned — someone who reapplies properly on the days they are outside is far better protected than someone who resolves to do it hourly and lasts a fortnight.
Deeper skin tones, and where the ladder differs
The standard advice was written for skin that burns readily, and it transfers badly. Melanin provides some baseline protection against burning, but it does not prevent photoageing, and it does not prevent pigmentary conditions — which are frequently the primary concern rather than a secondary one.
That changes the upgrade priority. Visible light, not only ultraviolet, contributes to melasma and post-inflammatory hyperpigmentation in deeper tones, and tinted formulations containing iron oxides are the ones with evidence for blocking it. So a tinted sunscreen is a functional upgrade here rather than a cosmetic one.
It also rules the classic mineral recommendation up or down on different grounds: untinted zinc can leave a grey cast that makes daily use unappealing, and a sunscreen not worn is not a sunscreen. Tinted mineral or a modern chemical filter usually solves it.
How we picked
The ladder is built on dose, not on formulation quality. Start is set by what price allows generous daily use, because every clinical figure for sunscreen assumes an application weight almost nobody reaches — so affordability is a protection variable, not a budget concession. Upgrade is set by UVA coverage and by texture, the two things that change outcomes for pigment-driven concerns and that determine whether reapplication happens at all. Overkill was chosen for a demonstrable reason rather than as a price complaint: powder cannot plausibly be applied at its tested weight, so its labelled figure and its real-world figure diverge. Evidence was weighted toward application-behaviour research over marketing claims.
What does not move you up a tier
A higher SPF number past 50. Water resistance if you are not swimming. Added antioxidants, which are a reasonable bonus and not a reason to choose one product over another. “Reef-safe” claims, which are unregulated and inconsistently defined.
Mineral versus chemical is a preference rather than a hierarchy. Mineral filters suit reactive skin and give dependable UVA coverage but can leave a cast on deeper tones; modern chemical filters are cosmetically lighter. Either can be excellent.
FAQ
Is SPF 100 worth buying?
Not really. The difference in UVB filtration between 50 and 100 is small, and the higher number tends to encourage longer exposure, which offsets it.
Do I need sunscreen indoors?
If you sit near a window or drive regularly, yes — glass passes UVA. In a room with no direct daylight, it matters much less than the internet suggests.
Does makeup with SPF count?
Only if you apply it at sunscreen thickness, which almost nobody does with foundation. Treat it as a bonus on top of a proper layer.
Bottom line
If you own no sunscreen, buy the cheap broad-spectrum one today and use a quarter-teaspoon every morning. That single change outperforms every upgrade below it.
Move up when UVA is your specific concern or when texture is what is stopping you reapplying. Stop before the powder compact and the three-step system. This sits alongside the wider question of how prescriptions change what your skin needs, in the full guide. More on skin.
