# Flight Radiation Calculator

URL: https://speedycalculator.com/calculators/everyday-life/flight-radiation/
Last updated: 2026-10-25

> The flight radiation calculator estimates the cosmic radiation dose you receive on a flight from the flight time and a typical dose rate for the route, and compares it with natural background radiation and a chest X-ray.

## Inputs

- Flight time (h)
- Route
- Custom dose rate (mSv/h)
- Number of such flights per year

## Results

- Dose for this flight
- Yearly dose from these flights
- Share of average yearly background (2.4 mSv)
- Equivalent chest X-rays (0.1 mSv each)

## Formula

```
Dose = flight time × dose rate
Typical dose rates: 0.002–0.005 mSv/h at cruising altitude, up to about 0.008 mSv/h on polar routes
```

## Explanation

At cruising altitude there is less atmosphere above you to absorb cosmic radiation, so the dose rate is roughly 100 times higher than on the ground. A single flight gives a very small dose – a transatlantic trip is comparable to a chest X-ray – but frequent flyers and aircrew accumulate measurable yearly doses.

### How to use the Flight Radiation Calculator

- **Flight time**
- **Route**
- **Custom dose rate**
- **Number of such flights per year**
- Every result field is editable: type into **Dose for this flight** and **Flight time** plus every other field update to match.

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Enter the flight time and pick a route type (or enter your own dose rate). Type a dose into the result to find how many flight hours it corresponds to.

### Tips

- Use your own measured figures – fuel economy, speed and prices vary a lot with driving style, traffic, load and season.
- Pick the unit in each field's menu (miles or kilometres, mpg or L/100 km); the calculator converts everything for you.
- Fill up to the brim twice and divide the distance by the fuel added to measure real fuel economy.
- For vehicle modifications, treat results as a starting point and confirm with the parts maker or a professional mechanic.

### Common mistakes to avoid

- Mixing US and imperial (UK) gallons – a UK gallon is about 20% bigger.
- Using the advertised fuel economy instead of real-world figures.
- Forgetting tolls, parking and wear and tear when comparing driving with public transport.

### Inputs explained

FieldWhat to enterFlight timeIn hRouteChoose one: Typical long-haul, mid-latitudes (0.003 mSv/h), Short-haul, lower altitude (0.0015 mSv/h), High-latitude long-haul (0.005 mSv/h), Polar route (0.008 mSv/h) …Custom dose rateIn mSv/hNumber of such flights per yearA number

### What each result means

- **Yearly dose from these flights** = [Dose for this flight]×[Number of such flights per year]
- **Share of average yearly background (2.4 mSv)** = [Yearly dose from these flights]÷2.4×100
- **Equivalent chest X-rays (0.1 mSv each)** = [Dose for this flight]÷0.1

### Example values

How the main result changes when **Flight time** changes and everything else stays at the example values above:

Flight time (h)Dose for this flight (mSv)3.50.01055.250.015870.0218.750.026310.50.0315140.042

## Worked example

Inputs — Flight time: 7 h; Route: Typical long-haul, mid-latitudes (0.003 mSv/h); Custom dose rate: 0.004 mSv/h; Number of such flights per year: 10.

Results — **Dose for this flight = 0.021 mSv**; Yearly dose from these flights = 0.21 mSv; Share of average yearly background (2.4 mSv) = 8.8 %; Equivalent chest X-rays (0.1 mSv each) = 0.21.

## FAQ

**Is flying a radiation risk?**
For passengers the dose is small; even 100 hours a year adds about 0.3 mSv, a fraction of natural background.

**Do pilots get more radiation?**
Aircrew receive about 1–5 mSv a year and are classified as occupationally exposed in many countries.

**Do airport scanners add radiation?**
Millimetre-wave scanners use no ionising radiation; backscatter X-ray scanners give a tiny dose of about 0.0001 mSv.

**What formula does the Flight Radiation Calculator use?**
Dose = flight time × dose rate.


## Sources

- [UNSCEAR – Sources and effects of ionizing radiation](https://www.unscear.org/)