Sunscreen Coverage Calculator
Calculate how much sunscreen you actually need for full body coverage.
Most people apply less than half the recommended amount — find the right dose for real SPF protection.
Sunscreen Needed
Sunscreen Dosage Rule
The dermatological standard is 2 mg per cm² of skin to achieve the labeled SPF.
Most people apply only 25–50% of the recommended amount — meaning actual protection is much lower than the SPF number on the bottle.
Practical rule of thumb:
- Face and neck: 1/4 teaspoon (1.25 ml)
- Each arm: 1/2 teaspoon (2.5 ml)
- Chest / Abdomen: 1 teaspoon (5 ml)
- Upper / Lower back: 1 teaspoon each (5 ml each)
- Each leg: 1 teaspoon (5 ml)
Full body: approximately 30–35 ml (1 oz) per application.
Reapplication: Every 2 hours when outdoors, or immediately after swimming or sweating. A standard 100ml bottle = about 3 full-body applications.