Measurements and theoretical calculations of meson form factors are essential for our understanding of internal hadron structure and QCD, the dynamics that bind the quarks in hadrons. The pion form factor has been measured at small momentum transfer (Q^2) using elastic scattering and pion electroproduction. On the other hand, in the limit of very large (or infinite) Q^2 perturbation theory is applicable. This leaves a gap in the intermediate Q^2 where the form factors are not known.
Jefferson Lab are upgrading their experiment and will measure pion and kaon form factors in this intermediate region, up to Q^2 of 6?8 GeV^2 for the pion. This is then an ideal opportunity for lattice QCD to make an accurate prediction ahead of the experimental results. Lattice QCD provides the state-of-the-art techniques to calculate form factors, and the challenge here is to control the statistical and systematic uncertainties as errors grow when going to higher Q^2 values. In this talk we report of a calculation that tests the method using an eta_s meson, a ‘heavy pion’ made of strange quarks, and also present preliminary results for kaon and pion form factors.