Calculate Your SCC Costs
Enter your herd details and bulk tank SCC to calculate the financial impact on your farm.
What-If Scenario
See how much you'd save by improving your herd's milk quality. Enter a target SCC and compare.
Current SCC
Target SCC
How to Use This Calculator
Set Your Units
Choose your currency (USD, EUR, GBP, NZD) and select the yield/price unit toggle. US farmers use lbs and $/cwt; international farmers use liters and $/liter.
Enter Herd Data
Input your number of lactating cows, average daily milk yield per cow, and your most recent bulk tank SCC from your last milk recording.
Review Results
See your SCC status, SCS score, estimated subclinical mastitis rate, and the daily and annual financial impact broken down by production loss and penalties.
Plan Improvements
Use the What-If scenario to see how much you'd save by reaching a target SCC. Share the results with your veterinarian or nutritionist to plan your mastitis control program.
SCC Penalty Tiers & Benchmarks
Most dairy cooperatives and processors use a tiered system for quality premiums and penalties. Here are the typical thresholds.
| SCC Range (cells/mL) | SCS | Status | Typical Impact |
|---|---|---|---|
| < 100,000 | < 3.0 | Excellent | Quality premium bonus, optimal production |
| 100,000 – 200,000 | 3.0 – 4.0 | Good | Minor production loss, may qualify for premium |
| 200,000 – 300,000 | 4.0 – 4.6 | Warning | Noticeable production loss, ~15% herd infected |
| 300,000 – 400,000 | 4.6 – 5.0 | Penalty | Cooperative penalties begin, ~22% herd infected |
| > 400,000 | > 5.0 | Critical | Heavy penalties, milk rejection risk, urgent action needed |
How Penalties Are Applied
- Per-unit penalty: Deduction per 1,000 cells/mL above threshold
- Flat deduction: Fixed deduction per cwt or liter when SCC exceeds threshold
- Rejection: Milk may be rejected or held if SCC exceeds 750,000+ (varies by processor)
- Premium forfeiture: Loss of quality bonus even if no direct penalty applies
Worked Example
150-Cow Holstein Herd — Bulk Tank SCC 350,000
Inputs
- 150 lactating cows
- 28 liters/cow/day average yield
- Bulk tank SCC: 350,000 cells/mL
- Milk price: $0.55/liter
Results
- SCS: 5.1 (action threshold exceeded)
- Estimated infection rate: 23.4% (~35 cows)
- Daily milk loss: 3.75 kg/cow × 150 = 562 kg/day
- Monthly production loss: ~$2,780
- Annual SCC cost: ~$33,360
- If reduced to 150K: saves ~$18,000/year
Frequently Asked Questions
What is a good bulk tank SCC for dairy cows?
A bulk tank SCC below 100,000 cells/mL is excellent. 100,000–200,000 is good, 200,000–300,000 is moderate, 300,000–400,000 is a warning, and above 400,000 triggers cooperative penalties. The lower your SCC, the higher your milk quality premium and the less production you lose to subclinical mastitis.
How much does high SCC cost a dairy farm?
High SCC costs farms between $2,000 and $15,000+ per 100 cows per year through lost milk production, cooperative penalties, treatment costs, and premature culling. Every 100,000 increase in bulk tank SCC above 200,000 results in approximately 2.5 kg of milk lost per cow per day.
What is Somatic Cell Score (SCS)?
SCS is a linear transformation of SCC using the formula SCS = log₂(SCC/100,000) + 3. It converts the logarithmic SCC scale into a linear 0–9 scale where each unit increase roughly corresponds to a doubling of cell count. SCS above 5 indicates a significant mastitis problem requiring action.
How accurate is the subclinical mastitis estimate?
The estimate (% infected = (SCS - 1.5) × 6.5) is a research-backed approximation based on the relationship between bulk tank SCC and herd infection prevalence. It provides a useful guideline — for precise diagnosis, individual cow testing (CMT or milk recording) is recommended.
What causes high somatic cell count?
The main causes are: (1) contagious mastitis spread during milking (Staph aureus, Strep agalactiae), (2) environmental mastitis from dirty bedding or housing (E. coli, Klebsiella), (3) incomplete milking procedures, (4) poor udder prep, (5) worn or damaged liners, (6) stress and immune suppression, and (7) chronically infected cows spreading infection to healthy cows.
How can I reduce my bulk tank SCC?
Key strategies include: (1) identify and cull chronically infected cows, (2) use proper pre- and post-milking teat disinfection, (3) milk infected cows last, (4) improve bedding hygiene, (5) ensure milking equipment is properly maintained, (6) implement a dry cow therapy program, (7) perform regular milk recording to track individual cow SCC, and (8) consult your veterinarian for a mastitis control plan.
When do cooperatives penalize for high SCC?
Most cooperatives start penalizing at 400,000 cells/mL, with increasing deductions at 500,000 and 750,000+. Some cooperatives also offer quality premiums for SCC below 200,000. Penalties are typically applied per hundredweight (US) or per liter (international) of milk shipped. Check your specific milk contract for exact thresholds.
Does SCC affect milk components?
Yes. High SCC is associated with reduced protein content (especially casein), which affects cheese yield and manufacturing properties. Butterfat may also be slightly reduced. This is why some cooperatives apply component-based penalties in addition to volume-based penalties for high SCC milk.
How does SCC change during lactation?
SCC naturally tends to increase as lactation progresses. Early lactation cows typically have lower SCC, while late-lactation and dry-period-transitioning cows tend to have higher SCC. This is why herd-level SCC often rises toward the end of the milking season. Regular monitoring throughout lactation is essential.
What is the difference between clinical and subclinical mastitis?
Clinical mastitis shows visible signs: swollen udder, abnormal milk (clots, watery), and often reduced appetite. Subclinical mastitis has no visible signs but elevates SCC and reduces milk production. Subclinical mastitis is far more common — for every clinical case, there are typically 3–4 subclinical cases quietly costing you production and quality.