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Light weight Geopolymer concrete (LWGPC) is an innovative material which combines both the advantages of light weight concrete and Geopolymer concrete. This concrete provides eminent solution to decrease the self-weight of a structure while using zero percent cement concrete materials and increase the scope of Geopolymer concrete (GPC). This study investigates the strength of fly ash based geopolymer concrete produced with Lightweight Expanded Clay Aggregates (LECA). Twenty concrete mixes were prepared to get an appropriate mix design for LWGPC. A mixture of sodium hydroxide and sodium silicate with 8 molarity was used as an alkali activator. The variables in the study include alkaline to binder ratio and percentage of LECA to produce concrete of densities 1800 kg/m³ and 2000 kg/m³. Fresh and harden characteristics of LWGPC are discussed in the form of slump and compressive strength …