Lumens by floor area
If you know the square footage but not the shape.
50 sq ft4.6 m²60 sq ft5.6 m²70 sq ft6.5 m²80 sq ft7.4 m²90 sq ft8.4 m²100 sq ft9.3 m²120 sq ft11.1 m²140 sq ft13 m²150 sq ft13.9 m²160 sq ft14.9 m²180 sq ft16.7 m²200 sq ft18.6 m²220 sq ft20.4 m²240 sq ft22.3 m²250 sq ft23.2 m²280 sq ft26 m²300 sq ft27.9 m²320 sq ft29.7 m²350 sq ft32.5 m²380 sq ft35.3 m²400 sq ft37.2 m²450 sq ft41.8 m²500 sq ft46.5 m²550 sq ft51.1 m²600 sq ft55.7 m²700 sq ft65 m²800 sq ft74.3 m²900 sq ft83.6 m²1000 sq ft92.9 m²1200 sq ft111.5 m²