Inventory Carrying Cost Calculator
Calculate the total annual cost of holding your inventory.
Results
Visualization
How It Works
Inventory carrying cost (also called holding cost) is the total expense of storing unsold inventory over time. It includes warehousing fees, insurance, the risk of products becoming obsolete, and the opportunity cost of capital that's tied up in stock rather than invested elsewhere. Most ecommerce businesses underestimate carrying costs — the industry benchmark is 20–30% of inventory value per year.
The Formula
Variables
- IV — Average Inventory Value — the dollar value of inventory you hold on average
- S% — Storage Cost % — warehouse rent, 3PL fees, or self-storage costs as % of inventory value
- I% — Insurance % — cargo and inventory insurance as % of inventory value
- D% — Depreciation % — loss from obsolescence, spoilage, or price erosion
- OC% — Opportunity Cost % — the return you could earn if the capital weren't tied up in inventory (often 8–12%)
Worked Example
An ecommerce store holds $50,000 in inventory on average. Storage at a 3PL costs 5%, insurance is 1%, obsolescence risk is 3%, and the owner's opportunity cost is 8%. Total carrying cost rate = 17%. Annual carrying cost = $50,000 × 17% = $8,500, or about $708/month. With 500 units, that's $17 per unit per year just to hold them.
Practical Tips
- The industry benchmark for carrying costs is 20–30% of inventory value — if you're above this, look for cheaper storage solutions.
- Reduce inventory levels through just-in-time ordering to cut carrying costs without risking stockouts.
- Fast-moving SKUs have lower carrying cost impact — focus on turning over slow-moving inventory with promotions.
- 3PL (third-party logistics) costs often appear low per cubic foot but add up quickly for large, heavy, or slow-moving products.
- Use your carrying cost rate in your EOQ (Economic Order Quantity) calculation to find the optimal reorder quantity.
Frequently Asked Questions
What is a typical inventory carrying cost rate?
Industry benchmarks suggest 20–30% of average inventory value per year. This includes all components: warehousing (5–10%), capital/opportunity cost (8–12%), insurance (1–3%), and obsolescence/shrinkage (3–5%). Ecommerce businesses using 3PLs often fall in the 25–30% range.
What is opportunity cost of inventory?
Opportunity cost is what your money could earn if it weren't tied up in inventory. If you have $50,000 in stock and could earn an 8% return investing that money elsewhere, the opportunity cost is $4,000/year. It's a real cost even though no cash changes hands.
How does carrying cost affect pricing?
Carrying cost should be factored into your product pricing. If a unit costs $10 to produce and $1.50/year to hold before it sells, and your average sell-through is 3 months, add $0.38 to your cost basis to account for holding time.
How do I reduce inventory carrying costs?
The most effective strategies are: (1) reduce order quantities and order more frequently, (2) liquidate slow-moving SKUs early via discounts, (3) negotiate better 3PL rates or switch to a more cost-efficient fulfillment provider, and (4) improve demand forecasting to avoid overstocking.
Should I include labor in carrying costs?
Labor for receiving, counting, and managing inventory is sometimes included in carrying cost calculations. For this calculator we use the four standard components (storage, insurance, depreciation, opportunity cost), but you can add a labor % estimate to the storage field if it's significant for your operation.