Public Health & Misc
Two calculations that arise in counselling rather than dispensing. Pack-year smoking history converts a smoking habit into the cumulative exposure figure used for lung cancer screening eligibility and risk assessment. The sun protection calculator estimates how far a given SPF extends the time before burning and what proportion of UVB it filters, which is useful when counselling a patient started on a photosensitising medicine.
Pack-year smoking history
Calculate cumulative tobacco exposure in pack-years, the standard measure used for lung cancer screening eligibility and risk assessment.
Sun protection — time to burn (SPF)
Estimate how long sun exposure can be extended by a sunscreen of a given SPF, and how much UVB it filters.
Where to go next
- Guides — longer explanations of how to work through a calculation and how to choose between related calculators.
- Practice problems — one worked problem for every calculator, solutions hidden until you open them.
- Reference tables and formula sheet — every constant and conversion factor used here, with citations.
- All 58 calculators — the full index, filterable by category.
Other categories
Also known as
pack year · pack-years · smoking history · tobacco · lung cancer screening · cigarettes · SPF · sunscreen · sunburn · time to burn · TTB · UV · photoprotection