Health Calculators
Retinol schedule.
Pick your experience and skin sensitivity and get a printable 4-week retinol calendar with rest nights, or a 4-night skin cycling plan. It follows a simple rule table written out below. Runs in your browser; nothing is sent or stored.
Your skin
Your 4-week calendar
Choose your options and press Build schedule.
How the schedule is built
The American Academy of Dermatology (AAD) quotes a dermatologist advising the least intense retinoid formula, used every other night to start and built up slowly, at night only, with sun protection every day and moisturiser to limit irritation. This tool turns that into a calendar. The exact night counts below are this tool's own conservative ladder, not figures from a study or guideline.
| Experience | Retinoid nights per week, weeks 1 to 4 |
|---|---|
| New | 2, 2, 3, 3 |
| Building up | 3, 3, 4, 4 |
| Established | 4, 4, 4, 4 (never nightly) |
- Sensitive skin: one fewer retinoid night each week (minimum 1), and no exfoliating acid nights.
- Exfoliating acids: one night a week, never the same night as the retinoid, placed as far from retinoid nights as the week allows.
- Rest nights: gentle cleanse and moisturiser only. These are the barrier nights.
- Skin cycling: a 4-night loop of exfoliate, retinoid, recover, recover, repeated across the 28 nights. It is a popular routine, not a clinically validated protocol. If you do not use acids, or choose sensitive, the exfoliate night becomes a recover night.
- Buffering (moisturiser sandwich): moisturiser, then retinoid, then moisturiser on retinoid nights. Optional, and not from the cited sources.
- Every morning: sun protection. Retinoids can make skin more sensitive to the sun.
- Change one thing at a time, and use the lowest-strength product you can find. Over-the-counter labels do not have to state the retinol percentage (AAD).
- Skip a night, or pause for a few days, if skin feels raw. Resume at the previous step.
Stop and see a doctor if
| Situation | Why |
|---|---|
| You have skin allergies, a lot of dryness, or a lot of redness or inflammation (possible rosacea) | The AAD says people with these are probably not good candidates for a retinoid. Ask a dermatologist first. |
| You have moderate or severe acne scarring, or acne linked to your periods or other hormonal changes | The AAD advises seeing a board-certified dermatologist before trying a retinoid. |
| You are pregnant, planning a pregnancy or breastfeeding | Discuss retinoids with a clinician. This tool gives no advice beyond that. |
| Swelling, hives, blistering, severe burning, or irritation that does not settle after pausing | General guidance (not from the sources below): stop using the product and get medical advice. |
| You have darker skin and notice dark marks after irritation | The AAD notes irritation can trigger dark marks (hyperpigmentation) in skin of color. Start slowly and use moisturiser. |
Sources (opened 2026-10-02): American Academy of Dermatology, Retinoid or retinol? (updated 5/25/21); Zasada M, Budzisz E. Retinoids: active molecules influencing skin structure formation in cosmetic and dermatological treatments. Postepy Dermatol Alergol 2019;36(4):392-397, which describes retinol as a vitamin A derivative in the retinoid group.
FAQ
How often should a beginner use retinol?
The American Academy of Dermatology quotes a dermatologist advising the least intense formula, used every other night to start and built up slowly. This tool starts a new user at 2 nights a week (more cautious than every other night), moving to 3 in week 3. It is a general pattern, not a prescription.
What is skin cycling?
A popular four-night routine: night 1 exfoliate (an acid), night 2 retinoid, nights 3 and 4 recover with moisturiser only. It is a social-media routine, not a clinically validated protocol, so treat it as one option and pause it if your skin is irritated.
What is retinol buffering (the moisturiser sandwich)?
Applying moisturiser before and after the retinol. The AAD notes that starting slowly and using moisturiser helps limit irritation. Buffering is optional and is not a figure from the cited sources.
Can I use exfoliating acids on the same night as retinol?
This tool never schedules them on the same night. Acids get their own night, once a week at most, and are dropped entirely if you say your skin is sensitive. This is this tool's conservative rule, not a published standard.
Do I need sunscreen with retinol?
The AAD advises using a retinoid at night only and wearing sun protection every day, because retinoids can make skin more sensitive to the sun.
Is retinol safe in pregnancy?
Talk to a clinician before using retinoids if you are pregnant, planning a pregnancy or breastfeeding. This tool gives no advice beyond that.
See also the water intake calculator and the caffeine half-life calculator.
Disclaimer
Not medical advice. This is a general pattern, not a prescription, and it does not replace a dermatologist or pharmacist. Prescription retinoids such as tretinoin follow your prescriber's directions. If your skin reacts badly, stop and get advice.