Acid hydrolysis of wheat flour (particle size, 4 μm) was carried out in a batch reactor between 75-95°C at varying acid concentrations (pH 2-5). Maximum (42%) conversion of starch to reducing sugar was obtained at 95°C and pH 3. Reaction follows First-order rate equation with respect to starch concentration and dependence of reaction rate constant κ on pH is incorporated. Activation energy (ΔE) and frequency factor (A) of reaction were 7806 R and 6.583×106[1/f (pH)] respectively. Time dependent conversion was observed with variation of temperature, pH and initial starch concentration within relative error of 19%.