# Work in Process Calculator

> Count and value the units still on the floor at the end of a period.

Page: https://freecalculator.tech/tools/work-in-process-calculator
Last reviewed: 2026-09-16

## Formula

Work in process = Units started − Units completed − Units scrapped; Value = Work in process × Cost invested per unit

- Work in process = Units started − Units completed − Units scrapped; Value = Work in process × Cost invested per unit.
- Inputs used: Currency, Units started in the period, Units completed in the period, Units scrapped in the period (optional), Cost invested in each unit still in process (optional).
- Edge handling: Units started in the period is required.; Units started in the period cannot be negative.; Units started in the period must be no more than 1000000000000.; Units completed in the period is required.; Units completed in the period cannot be negative..

## Inputs

- Currency
- Units started in the period
- Units completed in the period
- Units scrapped in the period (optional)
- Cost invested in each unit still in process (optional)

## Worked example: What is still on the floor at the end of the period

Only the units you entered are counted; opening work in process belongs in the units started.
1. Start with Currency: USD, Units started in the period: 5000, Units completed in the period: 4600, Units scrapped in the period (optional): 60, Cost invested in each unit still in process (optional): 18.
2. Apply the method: Work in process = Units started − Units completed − Units scrapped; Value = Work in process × Cost invested per unit.
3. Only the units you entered are counted; opening work in process belongs in the units started.

## Common questions

### Where does this formula come from?

MIT OpenCourseWare 2.854 Introduction to Manufacturing Systems — throughput is output per unit of time, cycle time is run time divided by the units produced, line capacity is set by the slowest station, and balance efficiency compares total work content with the number of stations multiplied by the longest station time. See the source link on this page.

### What kind of calculation is this?

What went in, less what came out and what was written off, optionally valued at the cost already invested in each unit. Check the formula, example, and limitations on this page before using the result for a real professional & industry decision.

### What are its limits?

Arithmetic over the figures entered — it cannot tell whether the measurements behind them are right. A measured result, an industry benchmark and an organisation's target are three different things; only the entered figures are used. A count at a point in time, not an average inventory, and not a flow-time calculation.

### How do I use the Work in Process Calculator?

Enter the required values for Currency, Units started in the period, Units completed in the period, Units scrapped in the period (optional), Cost invested in each unit still in process (optional). The calculator applies the formula on this page and shows the main result with any supporting breakdown so you can check the arithmetic.

### What formula does the Work in Process Calculator use?

Work in process = Units started − Units completed − Units scrapped; Value = Work in process × Cost invested per unit The visible formula section above lists the calculation path and the edge cases the page handles, so the result can be checked without relying on the form alone. Check the formula, example, and limitations on this page before using the result for a real professional & industry decision.

### Can the Work in Process Calculator be used for exact decisions?

Use it as a calculation aid, not as a substitute for checking the underlying rule, contract, policy, or professional advice that applies to your situation. When a result depends on local rules, personal details, prices, or dates, enter those values yourself and confirm them before acting.

## Limitations and assumptions

- Inputs outside the supported range are rejected rather than forced into a result.
- The result depends on the values you enter for this work in process calculator; it does not supply missing rates, rules, prices, dates, or assumptions for you.

## Sources

- Massachusetts Institute of Technology — https://ocw.mit.edu/courses/2-854-introduction-to-manufacturing-systems-fall-2016/

## Cite this page

- APA: Free Calculator. (2026, September 16). Work in Process Calculator. https://freecalculator.tech/tools/work-in-process-calculator
- MLA: "Work in Process Calculator." Free Calculator, 16 Sept. 2026, https://freecalculator.tech/tools/work-in-process-calculator.
- Link: Work in Process Calculator — Free Calculator, https://freecalculator.tech/tools/work-in-process-calculator