Flight Radiation Dose Calculator Welcome to our simple and effective radiation dose calculator! Use this tool to quickly determine the Effective Dose (mSv) you receive during a flight. Whether you’re curious about radiation on a short domestic trip or a long-haul international flight, our calculator has you covered. How to Use Enter a value in the 'Flight Time (hours)' field to calculate the effective dose in millisieverts (mSv). Our calculator uses an average radiation dose of 0.004 mSv per hour , based on data from Wikipedia . For example: A 7-hour flight results in a dose of 0.028 mSv . Time of flight (hrs) Dose rate (mSv/h) Effective dose (mSv) More Information About Flight Radiation Where Does the Radiation Come From? The radiation you are exposed to during a flight primarily comes from cosmic radiation, which becomes more intense as you fly higher. At typical cruising altitudes of 30,000-35,000...