  We calculate the pion and kaon electromagnetic form factors in finite volume
for a generic momentum transfer in space-like region, using SU(3) chiral
perturbation theory. To this end, we first find the hadronic matrix element in
a new form which is suitable for our calculation in finite volume. We present
our numerical findings for the chiral behavior and finite volume corrections
and compare these for pion and kaon form factors. As a result, for the pion
electromagnetic form factor we find the finite volume correction $\Delta
F^{\pi}_{em} = 0.0041$ at momentum transfer $q^2 = -0.1358$ and for the kaon
form factor $\Delta F^{K}_{em} = 0.0029$ at $q^2 = -0.1357$ with $m_{\pi} =
0.3128$ and $L = 2.6 fm$ as the linear size of the lattice.
