Opti-D Time Calculator

Reduce skin cancer and optimize Vitamin D synthesis. This App calculates how long you need to stay in the sun to receive the right amount of UV for optimal Vitamin D synthesis to keep you healthy whilst reducing your risk of developing skin cancer.

It is easy to use anywhere in the world,and provides simple one step information for your optimal health.

Thus the Opti-D Time Calculator helps you to REDUCE YOUR RISK OF SKIN CANCER as well as REDUCE YOUR RISK OF VITAMIN D DEFICIENCY.

To use the app, simply download and open.

The app will locate your position, worldwide and source the UV Index (intensity of UV Radiation) that is currently predicted for today.

You then simply enter your skin type and the level of cloud cover at your location.

It will also display the text "too long" if you cannot receive enough UV to synthesise enough Vitamin D for the day.

The Opti-D Time Calculator based on this information will calculate how much time you need to spend in the sun to receive "Just the Right Amount" for optimal Vitamin D synthesis as well as minimise your risks of developing skin cancer or other UV related diseases like cataracts, premature aging etc.

There are 6 defined skin types called "Fitzpatrick skin types" and they are defined by a picture in the app and are:-

Type I Light, pale white. Always burns, never tans

Type II White; fair. Usually burns, tans with difficulty

Type III Medium, white to olive. Sometimes mild burn, gradually tans to olive.

Type IV Olive, moderate brown. Rarely burns, tans with ease to a moderate brown.

Type V Brown, dark brown. Very rarely burns, tans very easily

Type VI Black, very dark brown to black. Never burns, tans very easily, deeply pigmented


The Opti-D Time Calculator is a complete assessment, measurement and educational tool for the analysis of solar Ultraviolet Radiation (UV). Specifically, this app was designed to provide methods to find the optimal amount of UV a person should be exposed to, for minimisation of health risks, such as skin cancer (too much UV) or vitamin D deficiency (too low UV).

At present, above 60% of Australians and above 20% of US Citizens will develop skin cancer in their lifetime. Moreover, above 30% of Australians and over 40% of US citizens are currently vitamin D deficient. The Opti – D calculator package provides the necessary tools to significantly reduce these numbers and could safe billions of health dollars by educative prevention of these solar UV related diseases. IT WILL HELP YOU SO THAT YOU DO NOT BECOME ONE OF THESE STATISTICS.

Measurements were made to calculate standard UV exposures and well as UV transmission properties world wide. Global UV index databases where accessed and manipulated to calculate and ascertain UV exposure levels world wide to produce global UV exposure indication software for analysis and education of current UV exposure requirements for optimal Vitamin D synthesis. These Opti-D Time Calculator was verified using calibrated UV dosmetry equipemnt to verify its accuracy.This allows the user to accurately receive the correct amount of UV exposure for their skin type for optimal health benefits. A UV exposure time calculator was also developed to predict the time required for solar UV exposure for optimal health benefits.