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Biosynthesis of silver nanoparticles (AgNP) using plant extracts is considered as an advanced method of synthesising AgNP using the green method. Although the leaf and the root of Ficus deltoidea Jack var. kunstleri (King) Corner (Mas Cotek) are known to have medicinal benefits, the study on its organs (leaf, stem, fig and root) to synthesise AgNP is still scarce. Therefore, this study determined the optimal synthesising conditions for AgNP-Leaf, AgNP-Stem, AgNP-Fig, and AgNP-Root, involving the volumes of plant extracts (1.0, 1.0, 0.8 and 3.0 mL), reaction times (30, 21, 33 and 21 h), reaction temperatures (60, 90, 100 and 90 °C), and solution pH (10, 12, 10 and 12). Thermogravimetric analysis (TGA) discovered that AgNP-Stem had the highest organic decomposition. All biosynthesised AgNPs exhibited spherical and crystal structures, with the particle sizes in the order of AgNP-Root (15.4 ± 3.4 nm) < AgNP …