# What is WMS – Warehouse Management System?

What is WMS – Warehouse Management System? Software for managing warehouse operations: receiving goods, placement, picking, packing, shipping.

## How it works in practice

A WMS is the warehouse's 'brain.' Without one, a worker searches for a product manually. With one, a screen shows 'Bin B3 → shelf 4 → unit 12.' It cuts picking time by 40-60% and reduces errors by 99%.

## Related metrics

- OMS — the OMS sends orders to the WMS
- SKU — the WMS manages by SKU
- Pick and Pack — the WMS streamlines this process
- 3PL — a 3PL operates a WMS

## Common misconception

'WMS is only for large companies.' There are WMS solutions for small businesses: Fishbowl, inFlow, Cin7 from $99/month. Even a Google Sheet with a warehouse map is a basic WMS. Above 50 SKUs and 30 orders/day, it's worth considering.

## How to fix it

Inefficient warehouse? (1) Map product locations — put top sellers near the packing area, (2) set up ABC slotting — A near the exit, C deeper in, (3) check pick accuracy rate — what % of orders are picked correctly? Target: above 99.5%.

## Real-world example

A clothing store: 150 orders/day, manual picking, 5 errors/day (3.3% error rate). A WMS with barcode scanning cut the error rate to 0.2%. Savings on returns and customer service costs: $5,000/month. The WMS cost $700/month — positive ROI from month one.

## Where to start

A WMS is needed at 100+ orders/day. Below that, manual processes are manageable. Above 100, every picking error costs $8-22 (return, support, and re-shipping). A WMS pays for itself within 2-3 months.

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Category: Operations · From the [Jimmy OS KPI Glossary](https://jimmy-os.com/glossary/kpi.md) · Source page: https://jimmy-os.com/glossary/kpi/wms-warehouse-management-system