The　response　of　monolithic　steel　plates　subjected　to　blast　was　extensively　studied,　and　dozens　of　dimensionless　numbers　were　proposed　to　predict　the　response.　While　the　existing　dimensionless　numbers　are　not　convenient　to　use　in　some　scenarios　with　relatively　complicated　conditions,　the　dimensionless　number　proposed　for　blast　loaded　steel　plates　based　on　dimensional　analysis　extends　the　range　of　application.　Different　from　other　dimensionless　numbers,　the　properties　of　medium　with　which　the　blast　load　transmits　are　incorporated　to　extend　the　application　range　to　more　general　scenarios.　The　responses　of　the　plate　subjected　to　both　near-field　blast　with　non-uniform　load　and　far-field　blast　with　uniform　load,　i.e.　both　the　external　and　internal　blasts　(for　steel　boxes),　are　reasonably　predicted.　The　physical　implication　of　the　proposed　dimensionless　number　is　clear　in　that　the　media　properties,　geometrical　features,　characteristics　of　material,　and　loading　are　incorporated,　which　are　readily　available　in　test.　A　variety　of　test　data　are　used　to　validate　the　applicability　and　versatility　of　the　proposed　dimensionless　number.