Measurement calculator that can be used to convert J/m² to mJ/m², among others: 1 J/m² = 1 000 mJ/m²
Convert J/m² to mJ/m²:Choose the right category from the selection list, in this case 'Surface tension'. Next enter the value you want to convert. From the selection list, choose the unit that corresponds to the value you want to convert, in this case 'J/m²'. Finally choose the unit you want the value to be converted to, in this case 'mJ/m²'.