Neutron dosimeters are important in various industrial applications such as at nuclear plants. The responses of neutron dosimeters are usually calibrated using monoenergetic neutrons of discretely limited energy points. We have developed a new calibration method to obtain a continuous response curve of a neutron dosimeter using pulsed white neutrons from 1 meV to 20 MeV all at once. The pulsed white neutrons are produced from the ⁷Li(d,n) reaction or Ta(γ,n) reaction with a thick target. In the calibration method, the response curve is determined by two-dimensional measurements of pulse height and neutron time of flight. It is expected that the calibration method will broaden application to more precise neutron dose evaluation in various fields such as work places with inherent spectra.