Estimate your cosmic radiation exposure during air travel. This tool helps frequent flyers, pilots, and cabin crew understand their radiation dose per flight and annually, with comparisons to medical X-rays and natural background radiation.
Here are typical radiation doses for common flight routes. Values assume standard cruising altitudes and typical flight times.
Distance: 2,450 miles · Time: ~5.5 hours
Altitude: 37,000 ft · Dose: ~25-35 μSv
Equivalent to about 1/3 of a chest X-ray
Distance: 3,450 miles · Time: ~7 hours
Altitude: 37,000 ft · Dose: ~35-50 μSv
Equivalent to about half a chest X-ray
Distance: 5,470 miles · Time: ~11 hours
Altitude: 39,000 ft · Dose: ~55-80 μSv
Equivalent to most of a chest X-ray
Distance: 900 miles · Time: ~2.5 hours
Altitude: 35,000 ft · Dose: ~10-15 μSv
About 1/10 of a chest X-ray
Flights: ~180 long-haul sectors/year
Annual Dose: ~2-4 mSv
Well within the 5 mSv crew limit but above the 1 mSv public limit
Flights: 24 transatlantic round trips/year
Annual Dose: ~1-2 mSv
Approaches the public exposure limit of 1 mSv/yr
At cruising altitudes, Earth's atmosphere provides less protection from galactic cosmic rays and solar particle events. The dose rate increases exponentially with altitude — roughly doubling every 2,000 ft above 30,000 ft.
Your radiation dose depends on: flight altitude (higher = more dose), latitude (polar routes receive more), flight duration, solar activity (solar minimum = higher dose), and geomagnetic shielding.
The general public limit is 1 mSv/year above background. Flight crew limit is 5 mSv/year (ICRP recommendations). By comparison, average background radiation is ~3 mSv/year depending on location.
For occasional flyers, the additional radiation is negligible. Even frequent flyers (50,000+ miles/year) receive doses well below thresholds associated with measurable health risks. Flight crew members approach but rarely exceed limits.
This calculator estimates cosmic radiation dose using established aviation dosimetry models based on altitude, latitude, and flight duration:
Where:
Distance-based estimation (alternative): roughly 0.003-0.006 mSv per flight hour at typical cruising altitudes (35,000-40,000 ft). Longer flights at higher latitudes and altitudes receive proportionally more.
A sievert (Sv) is the SI unit of equivalent dose for ionizing radiation. Because the sievert is a large unit, medical and aviation exposures are measured in millisieverts (mSv, 1/1000 Sv) and microsieverts (μSv, 1/1,000,000 Sv):
Cosmic radiation is high-energy particles, primarily protons and atomic nuclei, originating from outer space — including galactic cosmic rays from supernovae and solar particle events from the Sun. Earth's atmosphere and magnetic field provide substantial protection at ground level, but this shielding decreases significantly with altitude. At typical cruising altitudes of 35,000-40,000 feet, the radiation dose rate can be 100-300 times higher than at sea level.
Radiation exposure during flight is strongly influenced by altitude. At 30,000 ft, the dose rate is approximately 2.5 μSv/hr. At 35,000 ft it rises to about 6.5 μSv/hr, and at 41,000 ft it can reach 14 μSv/hr. Latitude also plays a key role — polar routes experience higher radiation levels (up to 1.4× equatorial routes) because Earth's magnetic field is weaker near the poles, allowing more cosmic particles to penetrate. This means a New York to Tokyo flight (polar route) receives more radiation than an equatorial route of the same distance.
Our Flight Radiation Calculator helps you estimate cosmic radiation exposure during air travel using established aviation dosimetry principles. Whether you're a frequent business traveler curious about your annual exposure, a concerned parent flying with children, a pilot or cabin crew member tracking occupational exposure, or just someone planning a long-haul vacation, this tool provides clear, science-based estimates.
Enter flight distance, duration, altitude, and frequency for personalized dose calculations that account for all major factors affecting cosmic radiation.
See your flight radiation in context — compared to dental X-rays, chest X-rays, annual background radiation, and regulatory exposure limits.
Results shown in both microsieverts (μSv) and millisieverts (mSv) with clear explanations of what the numbers mean for your health.
Uses dose rate tables from aviation dosimetry research, incorporating altitude and latitude effects for realistic exposure estimates.
Learn about cosmic radiation, how it varies with altitude and latitude, regulatory limits, and how it compares to other radiation sources.
Complete access to all features with no registration, no hidden fees, and no usage limits. Use it as often as you need.
Important Disclaimer: This Flight Radiation Calculator provides estimates based on general aviation dosimetry models and standardized dose rate tables. Actual radiation exposure varies based on solar activity, exact flight path, actual altitude profiles, geomagnetic conditions, and individual factors. This tool is for informational and educational purposes only and should not be used as a substitute for professional occupational radiation monitoring required by aviation regulatory authorities. Always consult with your airline's occupational health department if you have specific concerns about cosmic radiation exposure.