Supplement Cost Calculator: Cost per Day, Month, and Year

Monthly supplement cost tracking helps health-conscious consumers budget accurately and compare the true per-serving cost across different brands and sizes.

The core formulas:

Cost per Serving = Product Price / Number of Servings

Monthly Cost = Cost per Serving × Servings per Day × 30

Annual Cost = Monthly Cost × 12

Best Value Score = Cost per Serving / Dose per Serving (mg or IU)

What each variable means:

• Number of Servings — total servings in the container (not capsules — some servings are 2 or 3 capsules)
• Servings per Day — how many servings the label recommends or you actually take
• Dose per Serving — the active ingredient amount per serving in mg, mcg, or IU (used for comparing brands)
• Best Value Score — lower is better; shows cost per unit of active ingredient

Worked example: You take three supplements daily:

1. Vitamin D3: $18 for 360 softgels, 1 per day → $18/360 = $0.05/day
2. Magnesium glycinate: $32 for 120 capsules, 2 per day → $32/60 servings = $0.53/day
3. Omega-3: $45 for 90 softgels, 2 per day → $45/45 servings = $1.00/day

Total daily cost = $0.05 + $0.53 + $1.00 = $1.58/day Monthly cost = $1.58 × 30 = $47.40/month Annual cost = $47.40 × 12 = $568.80/year

Typical monthly supplement costs (US, 2024):

• Basic multivitamin: $10–$25/month
• Vitamin D3 (2,000 IU/day): $3–$10/month
• Magnesium: $15–$30/month
• Omega-3 (2g/day): $20–$45/month
• Creatine monohydrate (5g/day): $15–$25/month
• Collagen peptides (10g/day): $30–$60/month

Buying in bulk (90–180 day supplies) typically reduces cost per serving by 25–40% compared to 30-day bottles.