# OEE Improvement Value Calculator

> Source: https://netray.co/tools/oee-improvement-value-calculator
> Publisher: Netray (netray.co), AI and integration engineering for ERP and manufacturing systems.
> Section: Free Tools

## Short answer

Convert a planned OEE gain into extra good units and annual contribution margin, so the improvement can be justified.

## Category

cost-finance

## Industry

Discrete Manufacturing

## Audience

- Plant manager
- Continuous improvement manager
- Finance controller

## Tool

**Kind:** calculator

**Currency:** $

**Inputs:**

#### Planned production hours per year

**Key:** hours

**Type:** number

**Default:** 4800

**Min:** 0

**Step:** 100

**Unit:** hours

**Help:** Scheduled run time for the machine or line, after planned stops.

#### Ideal rate

**Key:** rate

**Type:** number

**Default:** 120

**Min:** 0

**Step:** 5

**Unit:** units/hour

**Help:** Fastest sustainable rate at good quality.

#### Contribution margin per good unit

**Key:** margin

**Type:** number

**Default:** 3.5

**Min:** 0

**Step:** 0.1

**Unit:** $

**Help:** Selling price minus variable cost.

#### Current availability

**Key:** a_now

**Type:** number

**Default:** 82

**Min:** 0

**Max:** 100

**Step:** 1

**Unit:** %

#### Current performance

**Key:** p_now

**Type:** number

**Default:** 80

**Min:** 0

**Max:** 100

**Step:** 1

**Unit:** %

#### Current quality

**Key:** q_now

**Type:** number

**Default:** 96

**Min:** 0

**Max:** 100

**Step:** 0.5

**Unit:** %

#### Target availability

**Key:** a_tgt

**Type:** slider

**Default:** 88

**Min:** 50

**Max:** 100

**Step:** 1

**Unit:** %

#### Target performance

**Key:** p_tgt

**Type:** number

**Default:** 85

**Min:** 0

**Max:** 100

**Step:** 1

**Unit:** %

#### Target quality

**Key:** q_tgt

**Type:** number

**Default:** 98

**Min:** 0

**Max:** 100

**Step:** 0.5

**Unit:** %

**Outputs:**

#### Current OEE

**Key:** oee_now

**Expr:** a_now * p_now * q_now / 10000

**Format:** percent

#### Target OEE

**Key:** oee_tgt

**Expr:** a_tgt * p_tgt * q_tgt / 10000

**Format:** percent

#### Good units per year today

**Key:** good_now

**Expr:** hours * rate * oee_now / 100

**Format:** integer

#### Good units per year at target

**Key:** good_tgt

**Expr:** hours * rate * oee_tgt / 100

**Format:** integer

#### Extra good units per year

**Key:** extra

**Expr:** good_tgt - good_now

**Format:** integer

**Primary:** true

#### Annual margin gained

**Key:** value

**Expr:** extra * margin

**Format:** currency

**Primary:** true

**Description:** Only real if the extra units can be sold or if they avoid overtime or capital spend.

#### Machine hours freed for the same output

**Key:** hours_freed

**Expr:** if(gt(oee_tgt,0), hours * (1 - oee_now / oee_tgt), 0)

**Format:** hours

**Description:** Time released if you only need today's output.

**Chart:**

#### Annual margin gained vs target availability

**Type:** line

**X:** a_tgt

**From:** 70

**To:** 98

**Steps:** 15

**Series:**

- value

**Disclaimer:** A model for decisions, not a forecast. Extra capacity only creates margin if there is demand or if it replaces overtime, outsourcing or new equipment. Use the contribution margin for products the line would actually make.

## Content

**Intro:** To fund an OEE project, you need to translate points of OEE into units and money. This calculator multiplies availability, performance and quality for today and for the target, and shows the extra good output and its margin.

**Sections:**

#### How to use the calculator

**Body:** Enter the hours the line is scheduled to run each year after planned stops, the ideal rate, and the contribution margin per good unit. Then enter current availability, performance and quality, and the target values for each. The calculator shows OEE now and at target, the extra good units per year, the annual margin gained and the machine hours you could release if demand stays flat. Slide the target availability to see how sensitive the result is to that factor.

#### The formula

**Body:** OEE is availability times performance times quality, each as a fraction. Good units equal planned hours times ideal rate times OEE. The gain is the difference between good units at target and today. Because the three factors multiply, a small gain in each can add up to a large OEE change: moving from 82, 80 and 96 percent to 88, 85 and 98 percent raises OEE from about 63 to about 73 percent.

**Bullets:**

- OEE = availability x performance x quality
- Good units = hours x ideal rate x OEE
- Value = extra good units x contribution margin

#### Using the result in a business case

**Body:** The margin figure is the upper bound if all extra output sells. If demand is limited, the better view is hours freed, which you can value as avoided overtime, avoided outsourcing or deferred capital for another machine. Compare the value to the cost of the improvement actions, such as tooling, sensors, training and engineering time. Present a conservative case with half the target gain, since first-round targets are often missed.

#### Common mistakes

**Body:** The most common error is using selling price instead of contribution margin, which overstates the benefit. Another is applying OEE gains to a machine that is not the bottleneck: output of the whole line will not rise. Also check that the ideal rate matches the rate used in your OEE measurement, or the units will not tie to your reports. Keep the same OEE definition for current and target figures.

**Cta:** If you want these figures from live data instead of estimates, we can show how OEE inputs from your ERP or MES can feed a business case automatically.

**Faq:**

#### Does a higher OEE always mean more profit?

**Answer:** Only if the extra output is useful. On a bottleneck with unmet demand, yes. On a machine with spare capacity, the benefit is lower cost through fewer hours, less overtime or deferred investment. Check where your constraint is first.

#### Which margin should I use?

**Answer:** Use contribution margin: price minus variable costs such as materials, direct energy and variable labor. Avoid full standard cost, which includes fixed overhead that does not change with output.

#### Should availability use planned or total time?

**Answer:** Use planned production time, which excludes planned stops like breaks and scheduled maintenance. If you need the loss against total calendar time, that is the TEEP view, which is a different metric.

#### How realistic is the target?

**Answer:** Use your own history. Plants rarely gain more than a few OEE points per quarter without capital change. Run the calculator with half of your intended improvement to see how the case holds up.

## Search terms

oee improvement value, oee roi calculator, value of oee increase, oee gain in units, oee business case calculator, cost of low oee, oee improvement savings

---
Talk to an engineer: https://netray.co/contact?intent=erp_ai | Machine catalog: https://netray.co/agent/catalog.json