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Flight Carbon Calculator

Estimates a flight’s CO₂e per passenger from distance and cabin class, including the altitude radiative forcing multiplier.

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Enter your figures and press Calculate.
In short Flight Carbon Calculator is a free online tool on inputtesthub.com that estimates a flight’s CO₂e per passenger from distance and cabin class, including the altitude radiative forcing multiplier. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.

How to use the Flight Carbon Calculator

  1. Enter your figures in the input fields.
  2. The result updates as you type, together with the full working.
  3. Check the breakdown table to see exactly how the number was reached.

About the Flight Carbon Calculator

The Flight Carbon Calculator estimates a flight’s CO₂e per passenger from distance and cabin class, including the altitude radiative forcing multiplier. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Estimating a trip’s footprint before offsetting.
  • Comparing economy against business.
  • Comparing a flight against the same journey by car.

Details

Short haul0.156 kg/pax-km
Long haul0.148 kg/pax-km
Radiative forcing× 1.9
Business seat≈ 3 economy seats of floor space

The maths behind it

This tool uses CO₂e = distance × an emission factor for the flight band × a cabin class multiplier × 1.9 for radiative forcing at altitude. Every intermediate value is shown on screen, so the result can be checked by hand.

Calculators differ wildly because of two choices: whether they include the radiative forcing multiplier for emissions released at altitude, and how they weight cabin class. Both are included here, which is why this figure is roughly double the ones that omit them.

Frequently asked questions

Does the Flight Carbon Calculator cost anything?
There is no cost and no cap. The Flight Carbon Calculator is not a demo of a paid product, so nothing is held back or watermarked.
Can you see what I put into this page?
No. The Flight Carbon Calculator runs entirely in your browser using JavaScript. Because the work happens locally, the page also keeps working if your connection drops, and closing the tab is all it takes to discard everything.
What formula does the Flight Carbon Calculator use?
It uses CO₂e = distance × an emission factor for the flight band × a cabin class multiplier × 1.9 for radiative forcing at altitude. The full working is printed under the result, so you can follow every step rather than trusting a black box.
Who is the Flight Carbon Calculator for?
Typical uses: estimating a trip’s footprint before offsetting. Comparing economy against business. Comparing a flight against the same journey by car. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Is there anything to watch out for?
Calculators differ wildly because of two choices: whether they include the radiative forcing multiplier for emissions released at altitude, and how they weight cabin class. Both are included here, which is why this figure is roughly double the ones that omit them.
Which values should I know?
Short haul is 0.156 kg/pax-km. Long haul is 0.148 kg/pax-km. Radiative forcing is × 1.9. These are printed on the page itself, so you do not have to take them on trust.
How precise is the result?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.

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