Plan inventory with clearer reorder and stock assumptions
Practical calculators and guides for reorder points, safety stock, days of supply, inventory turnover, carrying cost, order quantities and cycle-count workload.
Useful structure, not false certainty.
Inventory decisions become easier to review when demand, lead time, service buffer, order size and carrying assumptions are visible instead of buried in a spreadsheet.
Start with a calculator
Use assumptions that match your own operation, project or item.
Reorder Point Calculator
Estimate the stock level at which replenishment should be triggered from average demand, lead time and a safety-stock allowance.
Safety Stock Calculator
Estimate a simple safety-stock allowance using peak and average demand/lead-time assumptions.
Days of Supply Calculator
Estimate how many days current usable inventory can cover at an assumed daily demand rate.
Inventory Turnover Calculator
Estimate annual inventory turnover and average days inventory is held from cost-of-goods and average inventory values.
Inventory Carrying Cost Calculator
Estimate annual carrying cost from average inventory value and a user-supplied carrying-cost percentage.
EOQ Calculator
Estimate the classic economic order quantity from annual demand, order/setup cost and annual holding cost per unit.
Define
Set scope and units.
Estimate
Use visible assumptions.
Compare
Compare equivalent options.
Review
Learn from actual results.
Go beyond the tool
Inventory Planning Basics
A practical framework for balancing availability, cash tied up in stock and replenishment risk.
How Reorder Points Work
Understand the demand, lead-time and buffer assumptions behind a reorder trigger.
Safety Stock Without False Precision
How to think about safety stock as a documented uncertainty allowance rather than a magic number.
Lead Time and Replenishment Risk
Map supplier, transit, receiving and internal delays that affect replenishment.
Using Days of Supply
Use days-of-supply as a simple coverage metric without ignoring demand changes.
Understanding Inventory Turnover
Interpret inventory turns and days inventory without assuming faster is always better.
Safety, legal and professional boundaries
These tools are general inventory-planning aids, not accounting, tax, regulated-product, hazardous-material, food, pharmaceutical or safety-stock policy advice. Requirements for controlled, perishable or safety-critical inventory can be materially different; use applicable regulations, contracts, manufacturer requirements and qualified professional guidance.
Read the full disclaimer →Why user-supplied inputs matter
A transparent assumption is usually more useful than a universal number that ignores location, equipment, contracts or operating conditions.