E-Commerce Inventory Restock & OTB Planner: Optimize Cash Flow & Never Stock Out

Stop guessing how much inventory to buy. Dynamically calculate your Open-To-Buy (OTB), align restocks with sales velocity, and prevent your cash from getting trapped in dead stock.

Try the Live Interactive Demo

Before you dive into the features, test the power of the OTB Planner yourself. Access our live, fully functional demo, input your sales data, and see exactly how fast you can calculate your optimal restock orders.

Try Live Demo Now

The E-Commerce Cash Flow Trap: Tying Up Capital in Dead Stock

You launch a new product, it sells well, so you panic and order 5,000 more units. But suddenly the trend dies, and you are stuck with $50,000 worth of inventory sitting in a warehouse. Your cash flow is choked, and you can’t afford to buy the *next* winning product.

Buying inventory based on “gut feeling” is the fastest way to bankrupt a D2C brand. Traditional spreadsheets force you to manually calculate Open-To-Buy (OTB) formulas that break the moment your lead times from China change or your sales velocity drops. If you don’t mathematically align your purchasing with your actual sales forecasts and planned margins, your warehouse becomes a graveyard for cash.

It’s time to replace risky bulk ordering with a dynamic, mathematically sound OTB and restock planning engine.

What Makes This the Ultimate Inventory Planning Tool?

Built for e-commerce founders, merchandisers, and supply chain managers who need to maximize cash efficiency.

• Dynamic Open-To-Buy (OTB) Calculator: Automatically calculate exactly how much inventory you can afford to buy at any given moment, factoring in your planned sales, desired ending inventory, and starting inventory.
• Sales Velocity & Lead Time Logic: Don’t just look at total monthly sales. The tool factors in your daily sales velocity and supplier lead times to tell you exactly *when* to place the order so it arrives before you stock out.
• Dead Stock & Slow-Mover Identifier: Instantly flag SKUs that have a low turnover rate. See exactly how much cash is trapped in non-moving inventory so you can run promotions to clear it out.
• Cash Flow Impact Simulator: Input your supplier payment terms (e.g., Net 30, 50% upfront). See exactly how a large restock order will impact your weekly cash flow and bank balance.
• One-Click Buying Plan Export: Need to send the order to your procurement team or supplier? Export a perfectly formatted PDF of your OTB limits and recommended restock quantities in one click.

How It Works

1. Set Your Financial Targets: Input your planned revenue, desired gross margin, and beginning inventory value.
2. Input Sales Velocity: Enter current demand and supplier lead times for specific SKUs or categories.
3. Generate OTB Limits: View your automated Open-To-Buy budget and exact restock triggers to maximize sales without over-ordering.

Who Is This Tool For?

• D2C & E-Commerce Founders: Stop funding your warehouse and start funding your growth. Ensure every dollar spent on inventory has a mathematically proven ROI.
• Inventory Planners & Buyers: Ditch the broken Excel macros. Generate accurate OTB reports in seconds that actually reflect real-world lead times and velocity.
• Amazon FBA Sellers: Factor in Amazon’s complex inbound shipping times and storage limits to calculate exactly when to send inventory to FBA centers.
• E-Commerce CFOs: Get visibility into future cash requirements. Know exactly when large supplier payments are going to hit the bank account.

Enterprise-Grade Features, Zero Friction

• 🌙 Dark Mode Included: Easy on the eyes during long buying plan sessions.
• 💾 100% Local & Private (IndexedDB): Your proprietary sales velocity, supplier costs, and inventory margins never leave your browser. No cloud servers.
• 📦 Smart Alerting: Visual indicators instantly show you if you are over your OTB budget or dangerously close to a stockout.
• ⚡ Instant Calculations: Change a supplier’s lead time from 30 days to 60 days and watch the required reorder date and cash flow impact update instantly.

Frequently Asked Questions

What exactly is Open-To-Buy (OTB)?

OTB is a financial metric that tells you how much inventory you can afford to purchase during a specific time period without exceeding your planned cash flow and margin targets. It prevents you from over-buying.

Does this connect to Shopify or Amazon?

No, and that is by design. This is a strategic *planning* tool. You export your aggregate sales data from those platforms, input it here to calculate your OTB limits, and then use those limits to guide your actual purchasing decisions.

How does it handle seasonal inventory?

You can set different planned revenue and sales velocity targets per month. This allows the OTB calculator to automatically give you higher buying budgets for Q4 (if you are a retail brand) and restrict buying in Q1.

Is my inventory data secure?

Absolutely. This is a standalone HTML application. It does not send, store, or transmit your supplier data or sales metrics to any external server. Your data stays entirely on your local machine.