Thermophysical properties of 1-butyl-3-methylimidazolium dicyanamide [BMIM][DCA] {(p, ρ, T) data at T = (283.15 to 393.15) K, pressures up to p =100 MPa, and viscosity at T = (283.15 to 373.15) K and p = 0.101 MPa} are reported with an estimated experimental relative combined standard uncertainty of Δρ/ρ = ±(0.01 to 0.08) % in density and Δη/η = ±0.35 % in dynamic viscosity. The measurements were carried out with a recently constructed Anton-Paar DMA HPM vibration-tube densimeter and a fully automated SVM 3000 Anton-Paar rotational Stabinger viscometer. The vibration-tube densimeter was calibrated using doubledistilled water, methanol, toluene and aqueous NaCl solutions. An empiric equation of state for fi tting of the (p, ρ, T) data of [BMIM][DCA] has been developed as a function of pressure and temperature. This equation was used for the calculation of thermomechanical properties of the IL, such as isothermal compressibility, isobaric thermal expansibility, differences in isobaric and isochoric heat capacities, thermal pressure coeffi cient and internal pressure. Viscosity measurements were fi tted to the polynomial equation.