How do I calculate the thrust to weight ratio of an airliner?

Question

in SI units.

Answer 1

Find the thrust and convert in newton if necessary,
Find the maximum take-off weight and convert in kilograms if necessary, or in newton if you prefer(in this case you have adimensional ratio).

If you don't have these informations , making some very restrictive hypothesis, you can consider cruise flight, in cruise weight is equal to lift and thrust equal to drag, and lift over drag is aerodynamic efficiency, so thrust to weigth ratio can be considered the inverse of efficiency, but this is a very large approximation, very large.

Answer 2

step 1: weigh the airliner
step 2: measure the thrust of the engines
step 3: put them in a ratio together

fin

Answer 3

Find out the thrust of the engines.

Find out the weight with fuel + load.

Divide the first by the second. Expect a figure of 0.3 or so.