ABC Rules & Prioritization
Not all products deserve equal attention. ABC analysis helps you focus on what matters: 20% of your products generate 80% of your revenue. Treat them differently.
What is ABC Analysis?
ABC analysis divides your products into three categories based on their revenue contribution:
Grade A: Top 20% of products
├─ Contribute: ~80% of revenue
├─ Priority: HIGHEST
└─ Treatment: Frequent checks, high safety stock, tight control
Grade B: Middle 30% of products
├─ Contribute: ~15% of revenue
├─ Priority: MEDIUM
└─ Treatment: Standard checks, normal safety stock, balanced
Grade C: Bottom 50% of products
├─ Contribute: ~5% of revenue
├─ Priority: LOW
└─ Treatment: Infrequent checks, low safety stock, minimal effort
How to Grade Your Products
Step 1: Calculate Annual Revenue per Product
Formula: Annual Units Sold × Unit Price = Annual Revenue
Example (apparel store):
├─ Winter Jacket: 500 units × €50 = €25,000
├─ Blue T-Shirt: 2,000 units × €15 = €30,000
├─ Niche Specialty: 100 units × €30 = €3,000
├─ Running Shoes: 800 units × €80 = €64,000
├─ Summer Shorts: 1,200 units × €12 = €14,400
└─ Total: €136,400
Step 2: Sort by Revenue (Highest to Lowest)
Rank | Product | Revenue | % of Total |
-----|---------|---------|-----------|
1 | Running Shoes | €64,000 | 46.9% |
2 | Blue T-Shirt | €30,000 | 22.0% |
3 | Winter Jacket | €25,000 | 18.3% |
4 | Summer Shorts | €14,400 | 10.6% |
5 | Niche Specialty | €3,000 | 2.2% |
| TOTAL | €136,400 | 100% |
Step 3: Assign Grades by Cumulative Percentage
Grade A: Until cumulative reaches ~80%
├─ Running Shoes: 46.9%
├─ Blue T-Shirt: 22.0% (cumulative: 68.9%)
└─ Winter Jacket: 18.3% (cumulative: 87.2%) ← STOP HERE
Count: 3 products = Grade A
Grade B: Until cumulative reaches ~95%
├─ Summer Shorts: 10.6% (cumulative: 97.8%) ← STOP HERE
Count: 1 product = Grade B
Grade C: Everything else
├─ Niche Specialty: 2.2%
Count: 1 product = Grade C
Result:
Grade A: 3 products (60% of items, 87% of revenue)
Grade B: 1 product (20% of items, 11% of revenue)
Grade C: 1 product (20% of items, 2% of revenue)
Policy by Grade
Grade A Products (High Priority)
Characteristics:
- High revenue contributors
- Must always be in stock
- Customer satisfaction critical
Policies:
| Aspect | Setting |
|---|---|
| Safety stock days | 12-15 days |
| Reorder frequency | Weekly (2-3 times/week) |
| Service level | 95%+ (allow 1-2 stockouts/year) |
| Reorder point | Higher (more buffer) |
| Order quantity | Fixed or conservative |
| Review method | Real-time or daily reports |
| Expedite cost | Willing to pay |
Example: Running Shoes (Grade A)
Average daily sales: 2 units
Lead time: 30 days
Safety days: 14 days
Reorder point: (2 × 30) + (2 × 14) = 60 + 28 = 88 units
Reorder quantity: 2 × 7 × 4 weeks = 56 units
Maximum: 88 + 56 = 144 units
Action:
├─ Check inventory DAILY
├─ If below 88 units, order immediately
├─ Keep 88-144 units always
└─ Never allow stockout (critical product)
Grade B Products (Medium Priority)
Characteristics:
- Core business products
- Steady revenue
- Some flexibility acceptable
Policies:
| Aspect | Setting |
|---|---|
| Safety stock days | 8-10 days |
| Reorder frequency | Bi-weekly (every 2 weeks) |
| Service level | 90%+ (allow 10-20 days stockout/year) |
| Reorder point | Standard (normal buffer) |
| Order quantity | Flexible (adjust as needed) |
| Review method | Bi-weekly reports |
| Expedite cost | Negotiate if needed |
Example: Summer Shorts (Grade B)
Average daily sales: 3 units
Lead time: 30 days
Safety days: 9 days
Reorder point: (3 × 30) + (3 × 9) = 90 + 27 = 117 units
Reorder quantity: 3 × 7 × 5 weeks = 105 units
Maximum: 117 + 105 = 222 units
Action:
├─ Check inventory EVERY 2 WEEKS
├─ If below 117 units, order
├─ Keep 117-222 units typical
└─ Occasional stockout acceptable
Grade C Products (Low Priority)
Characteristics:
- Low revenue, slow movers
- Impulse buys or specialty items
- Stock more only if zero cost
Policies:
| Aspect | Setting |
|---|---|
| Safety stock days | 3-5 days |
| Reorder frequency | Monthly or as needed |
| Service level | 80%+ (allow 30-60 days stockout/year) |
| Reorder point | Lower (minimal buffer) |
| Order quantity | Flexible, batch with others |
| Review method | Monthly reports |
| Expedite cost | Never pay premium |
Example: Niche Specialty (Grade C)
Average daily sales: 0.3 units
Lead time: 30 days
Safety days: 4 days
Reorder point: (0.3 × 30) + (0.3 × 4) = 9 + 1 = 10 units
Reorder quantity: 0.3 × 7 × 4 weeks = 8 units
Maximum: 10 + 8 = 18 units
Action:
├─ Check inventory MONTHLY
├─ If below 10 units, order when convenient
├─ Keep 10-18 units typical
├─ Stockout acceptable, batch orders to save cost
└─ Never expedite (not worth it)
Real-World Grading Example
Company: Multi-location fashion retailer
Period: Last 12 months
Products: 85 SKUs total
Top 20% by Revenue (Grade A)
Product | Units | Unit Price | Revenue | % of Total |
--------|-------|-----------|---------|-----------|
Winter Jacket | 1,200 | €45 | €54,000 | 18.5% |
Jeans (Blue) | 2,400 | €35 | €84,000 | 28.8% |
Boots | 600 | €60 | €36,000 | 12.3% |
T-Shirt (basic) | 3,500 | €12 | €42,000 | 14.4% |
Sweater | 800 | €28 | €22,400 | 7.7% |
| | | €238,400 | 81.7% |
Grade A: 5 products (6% of SKUs) = 82% of revenue
Middle 30% (Grade B)
Summer Shorts | 1,200 | €15 | €18,000 | 6.2% |
Shirt (dress) | 800 | €25 | €20,000 | 6.9% |
Skirt | 600 | €30 | €18,000 | 6.2% |
| | | €56,000 | 19.2% |
Grade B: 3 products (3.5% of SKUs) = 19% of revenue
Bottom 50% (Grade C)
Accessories (various) | 2,400 total | €3-8 | €11,200 | average
Specialty items | 1,200 total | €5-15 | €8,000 | average
Clearance/Old | 800 total | €2-10 | €4,600 | average
| | | €23,800 | 8.1% |
Grade C: 77 products (91% of SKUs) = 8% of revenue
Summary
Grade A: 5 SKUs (6%) → 82% revenue → HIGHEST PRIORITY
Grade B: 3 SKUs (3.5%) → 19% revenue → MEDIUM PRIORITY
Grade C: 77 SKUs (91%) → 8% revenue → LOW PRIORITY
Focus: Spend 80% of your time on 9 SKUs
Result: Manage 92% of business value
Regrading (Annual Review)
Products change importance over time. Review quarterly, regrade annually.
November 30: Calculate last 12 months
├─ Which products grew? (might move from C→B or B→A)
├─ Which declined? (might move from A→B or B→C)
├─ Any new launches? (where do they fall?)
└─ Any discontinued? (remove from list)
December 1: Update your grading
├─ Adjust policies for moved products
├─ Celebrate improvements
└─ Monitor declines
Example movement:
Old: Niche Item = Grade C, €3,000/year
New: Niche Item = Grade B, €25,000/year
Action: Increase safety stock, check more frequently, higher reorder point
Using Grades in Multi-Location
When you have multiple warehouses, each location can have different grades:
Head office view:
Product: Winter Jacket
├─ Berlin warehouse (Grade A) — Popular in north
├─ Munich warehouse (Grade B) — Less popular
└─ Hamburg warehouse (Grade C) — Slow in coastal area
Policies by location:
├─ Berlin: High safety stock, weekly checks
├─ Munich: Medium safety stock, bi-weekly checks
└─ Hamburg: Low safety stock, monthly checks
FAQ
Q: How often should I regrade?
A: Annually minimum. For growing companies, quarterly. Fast-moving fashion: monthly.
Q: What if a Grade C becomes popular suddenly?
A: Check for trend. If sustained > 1 month, regrade to B. Update policies. No need to wait until next official review.
Q: Can a product be Grade A in one location and C in another?
A: Yes! Excellent point. That's why multi-location policies exist. Treat each location separately.
Q: What percentage should I use for cutoffs?
A: Standard is 80/15/5. Adjust for your business. Slow-moving inventory might be 70/20/10. Fast-fashion might be 90/8/2.
Q: Should I grade by revenue or profit?
A: Revenue is standard (simpler). If high-margin Grade C items exist, use profit instead. Usually same ranking anyway.
Next Steps
- List your top 20 products by revenue
- Calculate revenue contribution for each
- Sort and assign grades (A/B/C)
- Set policies per grade (from Policy Fundamentals)
- Implement in your system
Related Articles
- Policy Fundamentals — Core policy concepts
- Reorder Points & Safety Stock — Detailed calculations
Questions?
Contact support@synplex.io for help with your ABC analysis.