Smilodon gracilis, 2.5 million–500,000 years ago; was the smallest and earliest species, estimated at 120 to 220 lbs.

Smilodon fatalis, 1.6 million–10,000 years ago, weighed around 350 to 620 lbs and reached a shoulder height of 39 in and body length of 69 in.

Smilodon populator, 1 million–10,000 years ago; had a body mass range of 490 to 880 lb). It stood at a shoulder height of 47 in.