Most people receive a fraction of the SPF on the label. Adjust the inputs and watch your real-world protection update. Grounded in dermatology research, not marketing claims.
Labeled SPF is measured at 2 mg/cm² in a lab. Most people apply 25–50% of that, and protection scales non-linearly — apply less, lose disproportionately more SPF.
A small set of focused utilities, each one designed to answer a single sunscreen question precisely.
See how much SPF foundation, powder, and setting spray actually deliver.
Live UV, burn windows, and how reflective surfaces change your risk.
Know exactly when to reapply for your activity, sweat, and UV.
A behavioural snapshot of cumulative UV risk over time.
Calm, clear photoprotection after retinoids, peels, and procedures.
This tool is for educational purposes only and is not medical advice. Estimates are derived from peer-reviewed dermatology literature, ISO 24444 SPF testing methodology, and consensus photoprotection guidance. Always consult a qualified healthcare professional or dermatologist regarding skin concerns, sun exposure, or post-procedure care.