Sunscreen Calculator
Estimate how much sunscreen you need for face-only or body coverage.
The calculator also estimates how many bottles to pack and how long SPF can extend your burning time.
Result
Enter values to estimate sunscreen use.
Per application
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Total amount
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Bottles needed
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SPF protection
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Formula
Protection time = SPF x burning time
Total sunscreen = amount per application x applications per day x days
For body estimates, the calculator scales a practical coverage amount by body size. For face estimates, it scales by facial area.
Quick guide
| Scenario | Good starting point |
|---|---|
| Face only | Use the face estimator and a bottle size of 50-150 ml |
| Body with no coverage | Use the full-body estimate and one reapplication every two hours |
| Vacation week | Pack at least one spare bottle if you will be in the sun for several hours per day |
How to use it
- Choose whether you want a body or face-only estimate.
- Enter your size and clothing coverage, or your face dimensions.
- Add the number of days and hours in the sun.
- Click Calculate to get the amount, bottle count, and SPF window.
Frequently Asked Questions
No. SPF is a multiplier on your skin's burning time, not a direct minute value.
A common practical rule is every two hours, or more often if you swim or sweat heavily.
It is an estimate. Real use depends on how thickly you apply sunscreen and how much you reapply.
References
- OmniCalculator sunscreen reference
- Common SPF relationships and practical bottle-size planning.
- Last reviewed: March 2026.