Sunscreen Coverage Calculator
Calculate how much sunscreen you need for full body coverage.
Most people apply too little.
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.