  We compute explicit formulae for the constant terms and Fourier coefficients
for Eisenstein series on $\operatorname{Sp}(4,\mathbb{R})$, in terms of zeta
functions and Whittaker functions. We also develop a generalisation of
Ramanujan sums to $\operatorname{Sp}(4,\mathbb{Z})$, which appears as
coefficients in the Fourier expansion for the minimal Eisenstein series.
