  The compositeness $X$ is defined as the probability to observe the composite
structure such as the hadronic molecule component in a bound state. One of the
model-independent approaches to calculate $X$ is the weak-binding relation.
However, when the scattering length $a_{0}$ is larger than the radius of the
bound state $R$, the central value of the compositeness $X$ becomes larger than
unity, which cannot be interpreted as a probability. For the systems with
$a_{0}>R$, we need to estimate the compositeness with the correction terms. For
the reasonable determination of the compositeness, we first present the
quantitative estimation of the correction terms. Because the exact value of the
compositeness should be contained in its definition domain $0\leq X\leq 1$, we
propose the reasonable estimation method with the uncertainty band by excluding
the region outside of the definition domain of the compositeness. We finally
estimate the compositeness of physical systems, and obtain the result which we
can interpret as the fraction of the composite component.
