Cell counts depend on body size
AI-generated conceptual illustration of diverse cell shapes around a human silhouette; no numerical representation. Generated 2026-10-29. Prompt: “Vertical 4:5 scientific illustration of the human body as a mosaic of diverse cells, from red blood cells to nerve cells and muscle cells, arranged around a subtle human silhouette. Clean editorial textbook style, elegant and accurate cell shapes, no labels, text, numbers, or exact cell counts.”
The estimated number of cells depends on the reference body used. A 2023 calculation estimated about 36 trillion cells for a reference adult man weighing 70 kg and 28 trillion for a reference woman weighing 60 kg. Researchers have not settled on one final number of cell types: the count changes with how finely their differences are classified.