Inventory Calculator

How to use Inventory Calculator

1. Open Inventory Calculator in your browser — it loads instantly and works offline once cached.
2. Enter your values in the input fields. Every field is labelled so you know exactly what to type.
3. The result updates automatically as you type — there is no "submit" round-trip to a server.
4. Adjust any input to compare scenarios and see how the outcome changes in real time.
5. Copy or note the result. Nothing you enter is stored or sent anywhere.

Why use Inventory Calculator?

• 100% free with no limits, no sign-up and no watermarks.
• Private by design — your data are processed in your browser and never uploaded to a server.
• Fast and lightweight, with instant results even on a phone or a slow connection.
• Works everywhere — any modern browser on Windows, macOS, Linux, Android or iOS.
• Part of a full business suite, so related inventory tasks are one click away.

What people use Inventory Calculator for

• Working out reorder points and stock turnover.
• Valuing stock on hand for accounts.
• Identifying how much capital is tied up in inventory.

Inventory Calculator: limits and things worth knowing

• Inventory turnover is cost of goods sold ÷ average inventory. A turnover of 6 means stock is sold and replaced roughly every two months.
• FIFO, LIFO and weighted average produce different valuations from identical stock, and the difference grows with inflation. Many jurisdictions prohibit LIFO.
• Low turnover ties up cash and risks obsolescence; very high turnover risks stockouts. The right level is industry-specific — groceries and jewellery are not comparable.
• Reorder point = average daily usage × lead time, plus safety stock for demand variability.

Is it private and secure?

Your privacy is built in. Inventory Calculator runs completely on your device, so whatever you enter stays in your browser and is never transmitted, logged or stored on any server.

Network activity: none. Nothing is sent and nothing is fetched. This tool makes no network request at all once the page has loaded — which is why it keeps working if your connection drops.

You do not have to take that on trust — our privacy proof page publishes the Content-Security-Policy that enforces it, lists every third party it permits, and shows how to verify the whole claim yourself.

Learn more

Why Browser-Based Tools Are Safer for Your Files — Most online converters upload your files to a server. Client-side tools don't. Here's why that difference matters for privacy.