The Fitzpatrick scale is a six-type map of how human skin tends to respond to ultraviolet. Dermatologists developed it so clinics and researchers could talk about burn risk and color change in a shared language. Basky borrows that language for one calm job: to size a safe-sun window that fits you, not a stranger on the next towel.
It is not a beauty ranking. It is not a health grade. Type I is not “worse,” and Type VI is not “invincible.” Every type deserves respect for the sky overhead — and every type still pairs the timer with sunscreen, shade, and clothing.
What the six types mean in plain language
Think of the scale as a spectrum of sun response, not identity:
| Type | Everyday sketch | Basky MED constant (J/m²) |
|---|---|---|
| I | Burns very easily; rarely deepens in color | 200 |
| II | Burns easily; deepens a little | 250 |
| III | Sometimes burns; deepens gradually | 350 |
| IV | Burns less often; deepens readily | 450 |
| V | Rarely burns; deepens easily | 600 |
| VI | Deeply melanated; burns infrequently | 1000 |
Those MED constants are conservative, literature-style inputs Basky uses inside the Exposure Engine. They are not lab measurements of your body. They help Basky stay humble about how long to suggest you stay out.
For type-by-type guides, see Type I, Type II, Type III, Type IV, Type V, and Type VI.
How Basky asks (without the jargon)
Onboarding does not dump a medical chart on you. Basky asks something closer to: how does your skin handle a beach day? Your answer maps to a Fitzpatrick type. That is the whole ritual — warm, anti-shame, and reversible.
If you guessed wrong, or your sense of your skin changes with seasons, travel, or medications, you are not stuck. Open Settings, update your answer, and today’s minutes update with it. There is no account that locks a label forever. How Basky works stays the same: live UV plus your type, never a one-size-fits-all timer.
People often feel “between” two answers. That is normal. When unsure, pick the more cautious option. You can refine later. The goal is a calmer habit, not a perfect taxonomy.
Why skin type changes the minutes
Ultraviolet that can redden skin is often talked about as a minimal erythemal dose (MED) — the energy that can start a sunburn for a given skin response. Basky’s window aims well below that idea so outdoor time stays in wellness territory rather than injury territory.
The formula readers can see:
safeMinutes ≈ 0.40 × MED ÷ UVI, then clamp between 5 and 90 minutes.
The 0.40 is Basky’s ~60%-of-MED humility (you keep about 40% of the MED energy as the planning dose). It is a conservative estimate, not a measurement, and never a guarantee that you will burn at exactly n minutes. Biology, reflection, altitude, and meds all move the real world.
Illustration at UV index 5 (moderate) — labeled as Basky’s conservative estimate, not a measurement:
| Type | About… |
|---|---|
| I | ~16 min |
| II | ~20 min |
| III | ~28–29 min |
| IV | ~36 min |
| V | ~48 min |
| VI | ~80 min |
That UV-5 / Type III ~28–29 minute figure is the one Basky often uses in marketing because it sits in the middle of the story: real UV, real skin, a finite window. Same sky, six different ceilings — that is why the beach-day question exists.
Reading the sky beside your type
Skin type is only half the input. Today’s UV index is the other half. WHO-style bands help you talk about the sky without panic:
- Low (0–2) — gentler ultraviolet; windows can lengthen, and Basky’s upper clamp may apply
- Moderate (3–5) — useful daylight for a short bask; fair types still treat it as real UV
- High (6–7) — windows shrink; shade starts sooner
- Very High (8+) — short visits; this is “a little, then cover,” not “stay until you feel done”
High UV does not mean you failed by going outside. It means the same wellness idea happens in fewer minutes.
What the scale does not decide
- Sunscreen still matters for every type. A window is not a license to skip protection. See sunscreen and a sun timer.
- Clothing can change how Basky estimates vitamin D encouragement. Clothing does not stretch the safe window. See clothing and vitamin D.
- Photosensitizing medications and some skin conditions call for extra caution and a clinician — Basky cannot see your prescriptions.
- Reddening is not the goal. Basky never rewards going past the line. Read sunburn vs safe sun.
- Vitamin D encouragement is capped with the same safe-dose idea. The friendly estimate is not a prescribed dose.
Sensitive skin, seasons, and changing your mind
If your skin feels more reactive than the beach-day options suggest, start more conservative and read sensitive skin and sun. Basky is wellness guidance, not a diagnosis. A dermatologist is the right person for rashes, moles, medication questions, or anything that worries you.
Seasons can change how confident you feel about your answer. Spring UV can surprise people who spent winter indoors. Travel to higher altitude or brighter coasts can too. Updating Settings is part of the habit, not an admission you “got it wrong.”
Anti-shame is the point of the scale in Basky
Internet culture sometimes treats Fitzpatrick language like a ladder — fair skin as fragile failure, deep skin as armor. Basky rejects both stories. Type I gets short, careful windows without mockery. Type VI gets longer windows with an explicit reminder that melanin is not infinite armor. The scale exists so minutes fit; it does not exist so people can rank each other.
A calmer takeaway
Your Fitzpatrick type is a starting sketch for timing. Today’s UV is the other half. Together they become “about n minutes of safe sun” on the Today screen — then shade, clothing, and sunscreen still get the last word. Step out for a little, not a lot. Leave on time. That is the whole ritual.
Now on iPhone. The core is free, forever. General wellness guidance, not medical advice.