Pregnancy Weight Gain Calculator

Pregnancy Weight Gain – Quick Cheat Sheet

• Inputs: height, pre-pregnancy weight, current weight, and gestational week (0–42).
• BMI is calculated from pre-pregnancy weight and height to set your recommendation band.
• Singleton totals:
  • Underweight (BMI < 18.5): 28–40 lb (12.5–18 kg)
  • Normal (18.5–24.9): 25–35 lb (11.5–16 kg)
  • Overweight (25–29.9): 15–25 lb (7–11.5 kg)
  • Obese (≥30): 11–20 lb (5–9 kg)
• Typical weekly rate (2nd/3rd trimester): Underweight 1.0–1.3 · Normal 0.8–1.0 · Overweight 0.5–0.7 · Obese 0.4–0.6 lb/wk
• 1st trimester: usually ~1–4.5 lb total by week 13 (highly variable).
• To-date range: after week 13 ≈ 1–4.5 lb + (weekly rate × weeks after 13).
• Note: These are generalized guidelines—always follow your clinician’s advice.