How much sunscreen?
Tap where it goes. Then: when to reapply, and which kind suits your skin.
- 1Amount
- 2About you
- 3Your plan
teaspoon5 mL
Tap the body where it goesAnything that applies to you?
Tap all that fit, or none.
What’s your day?
Put it onOne coatReapply
SPF 30 filters about 97% of UVB rays. Higher numbers block slightly more, and none blocks 100%. The AAD asks for SPF 30 or higher; the Skin Cancer Foundation suggests SPF 50 or higher for a long day outdoors. SPF is a filter strength, not a timer: every SPF needs reapplying every 2 hours.
The AAD calls them convenient, but reminds you that sunscreen needs to be reapplied, SPF in makeup included. The amount counts too: if it goes on too thinly, it protects less (NHS).
Yes. The AAD says to use it even on cloudy days and in the winter, and Mayo Clinic says the same for cloudy days.
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Tap each one you find on yours.
The front, you just checked. The back lists every ingredient.
Educational, not medical advice. Amounts per area follow the teaspoon rule as printed in CMAJ (2015) · Sources last reviewed November 9, 2026
Sunscreen: how much, which SPF, mineral or chemical
Tap where it goes to see how much you need. Then when to reapply, and which filter suits your skin.
- 1 tspfor the face
- SPF 30+broad spectrum
- 2 hthen reapply
What the numbers mean
Why you need more than you think
The SPF on the bottle is measured with 2 milligrams of sunscreen on every square centimeter of skin. On a sun holiday, 20 people put on 0.79 mg/cm² on average, about 40% of that. In a skin cancer prevention trial, the median amount was less than half the test amount: roughly a quarter to half of the labeled SPF, a CMAJ article estimates.
SPF 30 vs 50: a small gap
SPF 30 filters about 97% of UVB rays. Higher numbers block slightly more, and none blocks 100%. The AAD asks for SPF 30 or higher; the Skin Cancer Foundation suggests SPF 50 or higher for a long day outdoors. SPF is a filter strength, not a timer: every SPF needs reapplying every 2 hours.
Our arithmetic from the FDA’s definition (SPF 30 = 30 times the UV it takes to burn): about 1 ÷ SPF gets through. The AAD gives 97% blocked for SPF 30. Only at the full test amount.
Broad spectrum means UVA too
SPF rates protection from sunburn, which comes from UVB. “Broad spectrum” means the product also passed the FDA’s UVA test. A sunscreen that isn’t broad spectrum, or is under SPF 15, must warn that it has been shown only to help prevent sunburn, not skin cancer or early skin aging.
Water resistant, never waterproof
A US label can say “Water Resistant (40 minutes)” or “(80 minutes)”: how long it was tested to last while you swim or sweat. The FDA rule calls “waterproof”, “sweatproof” and “sunblock” false or misleading claims. All sunscreens eventually wash off.
Filter status in 2026
The FDA proposes zinc oxide and titanium dioxide as safe and effective. For 12 other filters, including avobenzone, oxybenzone, homosalate and octocrylene, it asked for more data, and says that is not a conclusion that they’re unsafe.
- June 2026Bemotrizinol added: a UVA and UVB filter, up to 6%, for ages 6 months and up, used in Europe for decades.
- Sept 2026PABA and trolamine salicylate removed. The FDA knows of no US sunscreen that contains them.
Myth: chemical sunscreen is unsafe
Some filters are absorbed into the blood, and the AAD says that called for more research. But being absorbed doesn’t mean an ingredient is harmful: the AAD says the science doesn’t show any sunscreen ingredient sold in the US harms health. The FDA says to keep using sunscreen, along with shade, clothing and a hat.
Myth: mineral just reflects light
Mostly not. Zinc oxide and titanium dioxide mainly absorb UV, and only scatter and reflect a little of it. Both kinds work mainly by absorbing. What makes a sunscreen “mineral” is its label: zinc oxide, titanium dioxide or both. Anything else is chemical.
Skin Cancer FoundationCleveland ClinicAAD: FAQsAAD: the label
Retinoids and acids: more sun-sensitive
After four weeks on an alpha hydroxy acid like glycolic acid, people reddened more easily in UV light (18% more, in a study the FDA reports). The FDA advises sunscreen while you use AHAs and for a week after. Retinoids also make skin more sun-sensitive: use them at night, protect your skin by day (AAD).
Darker skin needs it too
Anyone can get skin cancer, whatever their skin tone. Visible light can also darken skin in people with darker skin tones: tinted sunscreens with iron oxides add protection against it. If a mineral sunscreen leaves a white cast, a tinted or micronized one avoids it, and chemical ones blend more easily.
Mineral vs chemical sunscreen, side by side
Every cell comes from a source below. Where the sources give no winner, neither do we.
| Question | Mineral | Chemical |
|---|---|---|
| Active ingredientsAAD: the labelFDA: 2026 orders | Zinc oxide, titanium dioxide or both | Anything else: avobenzone, homosalate, octisalate, octocrylene, oxybenzone, bemotrizinol… |
| How it worksSkin Cancer FoundationCleveland Clinic | Mainly absorbs UV; reflects and scatters a little | Absorbs UV and releases it as heat |
| FDA status, 2026FDA: 2026 ordersFDA: bemotrizinol | Proposed safe and effective | 12 filters need more data, not a finding that they’re unsafe; bemotrizinol safe and effective since June 2026 |
| Sensitive skin, rosaceaAAD: FAQsAAD: rosaceaCleveland Clinic | The AAD’s pick | If one irritates your skin, the AAD suggests mineral instead |
| PregnancyAAD: pregnancyCleveland ClinicFDA: 2026 orders | The AAD’s pick, to avoid irritation | Cleveland Clinic: both can be appropriate. The FDA: ask your health care professional if concerned |
| Acne-prone skinCleveland ClinicAAD: acne | Less likely to clog pores (Cleveland Clinic) | Either way, look for “non-comedogenic” (AAD) |
| On darker skinAAD: rosaceaCleveland ClinicMayo Clinic: skin tones | Can leave a white or grayish cast; tinted or micronized helps | Easier to spread and blend in |
Sunscreen in the rest of your routine
One face scan. Your whole routine, sorted.
This page answered your question. MySkincare starts from your own skin, and the products you already use.
- 1Scan your face3 photos: front, left profile, right profile.
- 2See your skin scoreFree6 zones scored separately: forehead, eye area, T-zone, both cheeks, chin.
- 3Scan your productsIt reads each ingredient list and says: keep it, watch it or replace it.
- 4Follow your routineMorning and night, checked so your products work together. With reminders.
Questions people ask
How much sunscreen should I put on my face?
At least 1 teaspoon, the AAD says: about enough to cover the length of your index and middle fingers. The teaspoon rule gives that same teaspoon to the face, head and neck together, so don’t go under it.
How much sunscreen do I need for my whole body?
Most adults need about 1 ounce, enough to fill a shot glass, and more for a larger body (AAD, FDA). Mayo Clinic says at least 2 tablespoons, the NHS 6 to 8 teaspoons, and the teaspoon rule adds up to 9 teaspoons (45 mL).
SPF 30 or SPF 50: which should I use?
The AAD recommends SPF 30 or higher: SPF 30 filters about 97% of UVB rays, and higher numbers block slightly more. The Skin Cancer Foundation suggests SPF 50 or higher for a long day outdoors. Most people apply less than the test amount, which lowers the SPF they actually get (CMAJ).
How often should I reapply sunscreen?
At least every 2 hours outdoors (FDA, AAD), and right after swimming or sweating. A water-resistant label tells you how long it lasts in water or sweat: reapply after 40 or 80 minutes, and right after towel drying.
Is mineral or chemical sunscreen better?
Neither is ranked overall. Dermatologists recommend mineral for sensitive skin, and the AAD suggests it during pregnancy. Chemical sunscreen blends in more easily on darker skin, and tinted mineral ones avoid the white cast. Cleveland Clinic’s dermatologist puts it simply: the best sunscreen is the one you’ll wear every day.
Are chemical sunscreens safe?
The FDA wants more data on 12 chemical filters, including oxybenzone and avobenzone, and says that is not a conclusion that they’re unsafe. The AAD says the science doesn’t show any sunscreen ingredient sold in the US harms health, and that being absorbed doesn’t make an ingredient unsafe.
What’s the difference between sunscreen and sunblock?
You won’t find “sunblock” on a US label: the FDA’s labeling rule lists it, along with “waterproof” and “sweatproof”, as false or misleading claims. Products are sold as sunscreen, mineral or chemical.
Do I need sunscreen on cloudy days or in winter?
Yes. The AAD says to use it even on cloudy days and in the winter, and Mayo Clinic says the same for cloudy days.
Is a moisturizer or makeup with SPF enough?
The AAD calls them convenient, but reminds you that sunscreen needs to be reapplied, SPF in makeup included. The amount counts too: if it goes on too thinly, it protects less (NHS).
Do I need sunscreen if I have dark skin?
Yes. Anyone can get skin cancer, regardless of skin tone (AAD, Mayo Clinic). Visible light can also darken skin in people with darker skin tones, and a tinted sunscreen with iron oxides protects against it.
How long before going out should I apply sunscreen?
About 15 minutes before, the FDA and AAD say. Mayo Clinic says about 30 minutes. If you’ll be out long enough to risk burning, the NHS suggests applying it twice: 30 minutes before you go out, then again just before.
Can I spray sunscreen on my face?
Not directly: the FDA says spray sunscreens should never be applied directly to your face.
Can babies wear sunscreen?
Not under 6 months, ideally: the FDA says sunscreen isn’t recommended for infants under six months, and the best protection is keeping them out of the sun. US labels say to ask a doctor for children under 6 months.
Sources
- Educational, not medical advice. Amounts per area follow the teaspoon rule as printed in CMAJ (2015)
American Academy of Dermatologyaad.org
- How to apply sunscreen (updated August 15, 2025)
SPF 30 or higher, water resistant, broad spectrum. About 15 minutes to protect. Most adults need about 1 ounce, a shot glass, more depending on body size. At least 1 teaspoon for the face, about the length of the index and middle fingers. Neck, ears, tops of feet, scalp; lip balm SPF 30+. Reapply every two hours and right after swimming or sweating; cloudy days and winter too. Tinted sunscreen with iron oxide protects against visible light and dark spots.
- Sunscreen FAQs (updated February 11, 2025)
SPF 30 blocks 97% of UVB; higher SPFs block slightly more; none blocks 100%. Dermatologists recommend mineral (physical) sunscreens for sensitive skin. All sunscreens absorb UV; physical ones also reflect it. The science doesn’t show any sunscreen ingredient sold in the US is harmful; being absorbed doesn’t mean unsafe. Anyone can get skin cancer, regardless of skin tone. Avoid sunscreen in babies under 6 months if possible. Cosmetics with SPF still need reapplying.
- How to decode a sunscreen label (updated September 21, 2026)
Titanium dioxide and/or zinc oxide = physical sunscreen; anything else = chemical. SPF 30 filters 97% of UVB. Water resistance: 40 or 80 minutes in the water. There’s no such thing as waterproof sunscreen.
- The latest in sun protection (2022)
Sunscreens used to leave a white film; tinted ones now match skin tones and should be considered for darker skin. Visible light can cause dark spots and darken darker skin; iron oxides in tinted sunscreens increase protection against it.
- How to fade dark spots in darker skin tones (updated March 10, 2025)
Tinted SPF 30+ sunscreen with iron oxide, which helps protect against visible light; a tint that blends in avoids a white cast.
- 7 rosacea skin care tips (updated April 3, 2024)
Broad spectrum SPF 30+, water resistant. If sunscreen irritates: zinc oxide and/or titanium dioxide, or silicone. Fragrance free, not “unscented”. Mineral sunscreens can leave a white cast, especially on darker skin; micronized or tinted ones avoid it.
- Dermatologist-approved pregnancy skin care (updated June 26, 2025)
Choose a physical sunscreen with zinc oxide, titanium dioxide or both during pregnancy, to avoid skin irritation; broad spectrum, SPF 30 or higher, water resistant.
- Acne, tips for managing (updated November 16, 2022)
Look for sunscreen labeled “non-comedogenic” or “won’t clog pores”; broad spectrum, water resistant, SPF 30+; some acne medicines make skin very sensitive to UV.
- Retinoid or retinol? (2021)
Retinoids can make skin more sensitive to the sun: use them only at night and always use sun protection during the day.
US Food and Drug Administrationfda.gov
- Questions and answers, FDA’s regulatory actions on over-the-counter sunscreen (content current as of September 10, 2026)
Zinc oxide and titanium dioxide are proposed as safe and effective (GRASE). Cinoxate, dioxybenzone, ensulizole, homosalate, meradimate, octinoxate, octisalate, octocrylene, padimate O, sulisobenzone, oxybenzone and avobenzone need more data, which is not a conclusion that they are unsafe. PABA and trolamine salicylate removed (Sept 10, 2026), no US product known to contain them. Bemotrizinol added (June 2026). People concerned about sunscreen while pregnant should ask a health care professional. Americans should use sunscreen with other sun protection.
- US FDA press announcement: FDA expands sunscreen options for the first time in 20 years (June 9, 2026)
Bemotrizinol protects against UVA and UVB; generally recognized as safe and effective at up to 6% for adults and children 6 months and older; used safely in Europe for decades.
- Sunscreen, how to help protect your skin from the sun (content current as of October 16, 2026)
Broad spectrum SPF 15 or higher; an average adult needs at least one ounce; apply 15 minutes before sun exposure; reapply at least every two hours, more often when swimming or sweating; water resistance lasts 40 or 80 minutes; no sunscreen is waterproof; never spray directly on the face; not recommended for infants under 6 months.
- Sun Protection Factor (SPF) (2017)
SPF measures how much UV energy it takes to burn protected skin; it relates to the amount of sun exposure, not time; more sunscreen means less UV absorbed; how often you reapply is critical.
- Alpha hydroxy acids (2022)
After 4 weeks of AHA use, sensitivity to UV reddening rose 18% and to UV cell damage doubled on average, reversibly. Use sunscreen while using AHAs and for a week after.
- The sun and your medicine (2024)
Some antibiotics (doxycycline, ciprofloxacin, tetracycline and others) and retinoids (acitretin, isotretinoin) can make skin more sensitive to the sun; cover up and use a broad spectrum sunscreen.
The Skin Cancer Foundationskincancer.org
- Sunscreen (updated September 2026, reviewed by Elisabeth G. Richard, MD)
One ounce (a shot glass) to the body each time; broad spectrum SPF 30+, SPF 50+ for a day outdoors; reapply every two hours and right after swimming or heavy sweating; mineral filters mainly absorb UV and only minimally scatter and reflect it; water resistant up to 40 minutes, very water resistant up to 80.
- Ask the expert, does a high SPF protect my skin better? (Steven Q. Wang, MD; updated June 30, 2026)
SPF measures how much more UVB it takes to burn protected skin; it is a filter strength, not a time multiplier. SPF 30 blocks about 97%. Reapply every two hours regardless of the number. SPF 50+ for extended outdoor activities.
Mayo Clinicmayoclinic.org
- Sunburn, symptoms and causes (2024)
Water-resistant, broad spectrum SPF 30+, even on cloudy days; at least 2 tablespoons (1 ounce) for all exposed skin; about 30 minutes before going out; reapply every two hours, more often when swimming or sweating; some medicines and AHA cosmetics increase sun sensitivity.
- Mayo Clinic Comprehensive Cancer Center blog: Sunscreen needs for any complexion (Naiara Sbroggio Barbosa, MD; August 8, 2023)
Anyone can get skin cancer, whatever their skin tone. Zinc sunscreen is less irritating for sensitive skin but thicker and whiter, which can be cumbersome on darker skin; chemical sunscreen is easier to spread and blend. Broad spectrum SPF 30+.
Cleveland Clinicclevelandclinic.org
- Mineral sunscreen, what it is and how to use it (Taylor Bullock, MD; June 12, 2026)
Both types work mainly by absorbing UV; mineral reflects and scatters some, less than many think. Mineral may be more comfortable on sensitive skin and is less likely to clog pores; it can leave a white or grayish cast, though formulas have improved. Tinted versions contain iron oxides. Both can be appropriate in pregnancy. The best sunscreen is the one you’re willing to wear every day.
NHSnhs.uk
- Sunscreen and sun safety (reviewed March 24, 2026)
About 6 to 8 teaspoons for an adult’s whole body; too thin a layer reduces protection; reapply every 2 hours and straight after water, towel drying or sweating; people of all skin tones can get skin cancer.
Studies and other sources
- 21 CFR 201.327: Over-the-counter sunscreen drug products, required labeling and test procedures (eCFR text via Cornell LII)law.cornell.edu
SPF is tested at 2 mg of sunscreen per cm² of skin. Broad spectrum means a critical wavelength of 370 nm or more. Labels say “Water Resistant (40 minutes)” or “(80 minutes)”; reapply after 40 or 80 minutes of swimming or sweating, immediately after towel drying, at least every 2 hours. Products that aren’t water resistant must say to use a water-resistant sunscreen if swimming or sweating. “Sunblock”, “sweatproof” and “waterproof” are false or misleading claims. Children under 6 months: ask a doctor.
- Kuritzky LA, Beecker J. Five things to know about … sunscreens. CMAJ 2015;187(13):E419cmaj.ca
Teaspoon rule (Isedeh et al. 2013): 1 teaspoon (5 mL) for face, head and neck; 1 per arm; 1 for the front and 1 for the back of the torso; 2 per leg; 9 teaspoons (45 mL) in all. In a trial, the median amount applied was less than half the SPF test amount, giving about a quarter to half of the labeled SPF. Both chemical and physical sunscreens are considered safe.
- Petersen B, Datta P, Philipsen PA, Wulf HC. Sunscreen use and failures: on site observations on a sun-holiday. Photochem Photobiol Sci 2013pubs.rsc.org
20 people on a sun holiday applied 0.79 mg/cm² on average, about 40% of the 2 mg/cm² used to test SPF; sunburn was most often on the chest and head.
- Taylor S, Diffey B. Simple dosage guide for suncreams will help users. BMJ 2002;324:1526bmj.com
SPF is measured at 2 mg/cm²; people typically apply 0.5 to 1.5 mg/cm², which may give about a third of the labeled SPF.