That calculator is certainly a wake up call for me too. It seems overly dramatic. But I guess it's the best free way most of us have to estimate, along with those cheap digital smart scales of questionable value.
Of course, lab results are much better for determining actual health effects:
| 7 | Waist-to-Height | Geometric: At 5'9", your target waist should be <34.5". |
| 8 | Thigh Circum. | Protective: Larger, muscular thighs act as a "metabolic sink." |