Free supply chain tools for manufacturers
Use these free supply chain tools to work out landed cost, safety stock, inventory turnover, economic order quantity, container loading and tariff impact. Enter your own numbers and get a planning estimate in seconds. Everything runs in your browser, so nothing you enter is sent anywhere or stored.
Pick a calculator
Landed cost calculator
Add freight, duty and fees to the ex-works price to see your true cost per unit.
Safety stock calculator
Set buffer stock and a reorder point from demand and lead-time variability.
Inventory turnover calculator
Work out turns, days of inventory and annual carrying cost.
Economic order quantity calculator
Find the order quantity that balances ordering and holding costs.
Container load calculator
Estimate cartons per 20ft, 40ft and 40ft HC container from carton size and weight.
Tariff cost calculator
See how a duty change affects your landed unit cost and margin.
Reorder point calculator
Find when to reorder from daily demand, lead time and safety stock.
About these tools
Each calculator uses a standard, simple formula and the numbers you type in. Nothing you enter is sent anywhere or stored. These tools give estimates for planning only. They are not a quote, a customs ruling or legal advice, and duty rates should always be confirmed with a customs broker.
If your results raise bigger questions, we can help through our supply chain and operations consulting.
Supply chain news tracker
Headlines from three supply chain and logistics publishers, updated live from their feeds.
Supply Chain Dive
SupplyChainBrain
FreightWaves
Headlines link to the original publishers.
Talk through your numbers on a free 30-minute call
Bring your inputs and we will help you check the assumptions and think through the options. We agree the scope with you before any work starts.
Which formula when: a guide to inventory formulas
Each calculator above answers a different question. Use this guide to pick the right one, then read the matching article for the method and its limits.
- “How much buffer do we need?” Use the safety stock calculator. Read the safety stock formula guide.
- “When should we reorder?” Use the reorder point calculator. Read the reorder point formula guide.
- “How much should we order at once?” Use the EOQ calculator. Read EOQ vs MOQ.
- “What does this part really cost us?” Use the landed cost calculator. Read how to calculate landed cost.
- “What will a tariff change cost?” Use the tariff cost calculator. Read practical ways to reduce tariff exposure.
- “How much fits in a container?” Use the container load calculator.
- “Is our inventory moving fast enough?” Use the inventory turnover calculator. Read what is a good inventory turnover ratio?.
Before you trust the numbers
- Formulas assume your inputs are right. Check lead times and usage history first.
- Not every item needs the same rule. ABC/XYZ classification shows where precise rules pay off.
- Some stock should not be reordered at all. Read how to find and clear dead stock.
When a spreadsheet stops being enough, see inventory optimization consulting or supply chain software for small manufacturers.