B ByaparOS
Industry Solutions
Procurement & Working Capital Optimization

Economic Order Quantity (EOQ) & Safety Stock Calculator

Find the sweet spot between ordering transport costs and warehouse bank interest. Calculate exact EOQ batch sizes, safety stock buffers, and reorder intervals.

Quick Industry Presets (नेपाल उद्योग उदाहरणहरू)

Inventory & Cost Parameters

Wilson EOQ Model
Units/Year
Rs.
Rs.

Truck freight, PO handling, customs entry

5% (Low) 18% - 22% (Nepal Bank Overdraft + Rent) 40% (High Obsolescence)
Safety Stock Buffer Parameters Lead Time Buffer
Recommended Purchase Order Size EOQ
आर्थिक अर्डर परिमाण:
Orders / Year
Order Every
Safety Stock Buffer

Annual Inventory Cost Tradeoff

Freights, challans & processing Bank overdraft interest & storage
Reorder Point Trigger (ROP)
Place new PO when stock drops to:
Procurement specification copied to clipboard!

Wilson Economic Order Quantity & Buffer Formulas

1. Economic Order Quantity (EOQ):
EOQ = √((2 × D × S) ÷ H)

Where D = Annual Demand, S = Order/Delivery Cost, H = Annual Holding Cost per unit.

2. Safety Stock & Reorder Point:
SS = Z × σd × √(Lead Time)
ROP = (Daily Demand × Lead Time) + SS

Protects against highway landslide delays and sudden festive demand spikes.

Frequently Asked Questions (प्रायः सोधिने प्रश्नहरू)

Economic Order Quantity (EOQ) is the optimal order batch size that minimizes the sum of inventory ordering costs (freight, customs handling, transport challans) and holding costs (warehouse rent, bank interest on working capital, damage, and obsolescence). Ordering too little inflates delivery costs; ordering too much locks up working capital in dead stock.
In Nepal, typical inventory holding costs range between 18% and 25% per year. This includes commercial bank working capital loan interest (9%–13%), warehouse rental and electricity (4%–6%), insurance (1%–2%), and risk of damage, theft, or seasonal obsolescence (3%–5%).
Safety stock is buffer inventory kept to protect against supplier delays (e.g. Birgunj border customs hold-ups, landslide blockages along Narayanghat-Mugling highway) and sudden demand spikes. Higher lead time variance requires a larger buffer to guarantee 95%–99% service levels.
As order quantity increases, the number of orders per year decreases (reducing annual delivery and administrative costs), but average inventory held increases (raising storage and capital interest costs). The EOQ formula finds the exact point where these two opposing costs intersect.
Yes. ByaparOS tracks real-time stock balances across warehouse bins. When inventory hits the Reorder Point, the system automatically drafts a Purchase Order with the pre-configured EOQ batch size and notifies your procurement team via in-app and WhatsApp alerts.
Automated Purchase Orders

Never run out of stock or overpay for emergency freight.

ByaparOS tracks real-time stock balances across warehouse bins and automatically drafts purchase orders with pre-calculated EOQ quantities when inventory hits your Reorder Point.