EOQ Calculator

What the EOQ Calculator does

EOQ Calculator focuses on economic order quantity under steady-demand assumptions. It uses only values entered on the page and keeps the arithmetic deterministic.

The output is a planning estimate. It should be checked against source systems, contracts, tax rules, payroll rules or inventory operations before decisions are finalized.

How to use the EOQ Calculator

Enter values from the same period or operating scenario, choose the relevant mode when a mode is offered, then calculate.

Use the detailed rows when you want a blended result across campaigns, employees, plans, cost lines or inventory snapshots.

Formula

EOQ = square root of (2 x annual demand x order cost / annual holding cost per unit).

Variable definitions

Annual demand is expected yearly units. Order cost is cost per order. Holding cost can be entered directly or estimated from unit cost and annual holding percent.

Calculation steps

NexaCalc validates required denominators, converts units when needed, runs Decimal.js arithmetic, then rounds only for display, tables and CSV export.

• Check required inputs and reject zero denominators.
• Convert units or periods into the formula basis.
• Calculate the headline result and supporting comparisons.
• Show warnings, CSV rows and visual bars without hiding assumptions.

Assumptions

These assumptions are visible because business calculators are only as useful as the definitions behind the inputs.

• Demand is steady.
• Ordering cost and holding cost are stable.
• No quantity discounts, stockouts or supplier constraints are modeled.

Reverse calculations and planning outputs

Where practical, the page also solves adjacent planning questions from the same input set.

• Whole EOQ
• Orders per year
• Average inventory
• Days between orders
• Ordering cost and holding cost comparison
• Proposed order quantity cost

Worked example

Example: 10,000 annual units, 40 ordering cost and 5 holding cost per unit gives an EOQ of 400 units.

Result interpretation

The headline result answers the main calculation question. The secondary cards show unit economics, cost drivers, comparison values or operational thresholds.

Visual bars are neutral context. They are not industry benchmarks and do not label a business as healthy or unhealthy.

Common mistakes

Most mistakes come from mixing definitions, periods or numerator and denominator sources.

• Using monthly demand as annual demand.
• Entering total holding cost instead of holding cost per unit.
• Forgetting minimum order quantities and price breaks.

Limitations

This calculator does not connect to accounting, payroll, ad, inventory, banking or subscription systems.

• Does not optimize purchase discounts.
• Does not model variable lead time.
• Does not account for warehouse capacity or cash constraints.

Compliance and accounting note

The calculator is not a substitute for tax, payroll, legal, accounting, procurement or revenue-recognition review. Use the result as a transparent worksheet, not as a filing or compliance position.

Related calculators

EOQ Calculator is part of the Business Phase 3 cluster for acquisition, inventory, payroll, pricing, projects and subscription revenue. Use the related calculators when the question shifts to an adjacent metric.

Rounding and exports

The engine calculates with Decimal.js and rounds display values after calculation. CSV exports escape spreadsheet-sensitive text before download.

Privacy

Inputs are calculated in the browser session. NexaCalc does not require an account or store these Business Phase 3 calculator values.

Disclaimer

Inventory results depend on demand, lead-time and cost assumptions. Actual demand, supplier performance and stockouts may differ.

Frequently asked questions

References

• Investopedia, Inventory Turnover Ratio overview. Source.
• Investopedia, Days Sales of Inventory overview. Source.
• Investopedia, Economic Order Quantity model overview. Source.

Business Phase 3 references and formula families reviewed on June 29, 2026.