Oee Calculator

Overall Equipment Effectiveness (OEE) Calculator

function calculateOEE() { var plannedTime = parseFloat(document.getElementById('plannedTime').value); var downtime = parseFloat(document.getElementById('downtime').value); var totalUnits = parseFloat(document.getElementById('totalUnits').value); var goodUnits = parseFloat(document.getElementById('goodUnits').value); var idealCycleTime = parseFloat(document.getElementById('idealCycleTime').value); var resultDiv = document.getElementById('oeeResult'); resultDiv.innerHTML = "; // Clear previous results // Input validation if (isNaN(plannedTime) || plannedTime <= 0) { resultDiv.innerHTML = 'Please enter a valid Planned Production Time (must be greater than 0).'; return; } if (isNaN(downtime) || downtime = plannedTime) { resultDiv.innerHTML = 'Downtime cannot be greater than or equal to Planned Production Time.'; return; } if (isNaN(totalUnits) || totalUnits < 0) { resultDiv.innerHTML = 'Please enter a valid Total Units Produced (cannot be negative).'; return; } if (isNaN(goodUnits) || goodUnits totalUnits) { resultDiv.innerHTML = 'Good Units Produced cannot be greater than Total Units Produced.'; return; } if (isNaN(idealCycleTime) || idealCycleTime 1) { performance = 1; } // 3. Calculate Quality var quality = (totalUnits > 0) ? (goodUnits / totalUnits) : 0; // Avoid division by zero if no units produced // 4. Calculate OEE var oee = availability * performance * quality; // Display results var outputHTML = '

OEE Calculation Results:

'; outputHTML += 'Availability: ' + (availability * 100).toFixed(2) + '%'; outputHTML += 'Performance: ' + (performance * 100).toFixed(2) + '%'; outputHTML += 'Quality: ' + (quality * 100).toFixed(2) + '%'; outputHTML += 'Overall Equipment Effectiveness (OEE): ' + (oee * 100).toFixed(2) + '%'; resultDiv.innerHTML = outputHTML; } .oee-calculator-container { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; max-width: 700px; margin: 20px auto; padding: 25px; border: 1px solid #e0e0e0; border-radius: 8px; background-color: #f9f9f9; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05); } .oee-calculator-container h2 { text-align: center; color: #333; margin-bottom: 25px; font-size: 1.8em; } .calculator-form .form-group { margin-bottom: 18px; display: flex; flex-direction: column; } .calculator-form label { margin-bottom: 8px; font-weight: bold; color: #555; font-size: 0.95em; } .calculator-form input[type="number"] { padding: 12px; border: 1px solid #ccc; border-radius: 5px; font-size: 1em; width: 100%; box-sizing: border-box; } .calculator-form input[type="number"]:focus { border-color: #007bff; outline: none; box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25); } .calculator-form button { background-color: #007bff; color: white; padding: 12px 25px; border: none; border-radius: 5px; cursor: pointer; font-size: 1.1em; font-weight: bold; width: 100%; transition: background-color 0.3s ease; margin-top: 15px; } .calculator-form button:hover { background-color: #0056b3; } .calculator-result { margin-top: 30px; padding: 20px; border: 1px solid #d4edda; border-radius: 8px; background-color: #e9f7ef; color: #155724; font-size: 1.1em; line-height: 1.6; } .calculator-result h3 { color: #155724; margin-top: 0; margin-bottom: 15px; font-size: 1.4em; } .calculator-result p { margin-bottom: 10px; } .calculator-result p:last-child { margin-bottom: 0; } .calculator-result span { color: #007bff; } .oee-calculator-container h3 { color: #333; margin-top: 30px; margin-bottom: 15px; font-size: 1.5em; } .oee-calculator-container p { line-height: 1.6; color: #444; margin-bottom: 10px; } .oee-calculator-container ul { list-style-type: disc; margin-left: 20px; margin-bottom: 15px; color: #444; } .oee-calculator-container ul li { margin-bottom: 8px; } .oee-calculator-container strong { color: #333; }

Understanding Overall Equipment Effectiveness (OEE)

Overall Equipment Effectiveness (OEE) is a powerful metric that provides a comprehensive view of how effectively a manufacturing operation is utilized. It identifies the percentage of manufacturing time that is truly productive. An OEE score of 100% means you are manufacturing only Good Parts, as fast as possible, without any Stop Time.

OEE is crucial for lean manufacturing and continuous improvement initiatives because it highlights losses, benchmarks progress, and provides a clear path to improving manufacturing performance. By breaking down productivity into three measurable components—Availability, Performance, and Quality—OEE helps pinpoint specific areas for improvement.

The Three Pillars of OEE

OEE is calculated by multiplying its three core components:

OEE = Availability × Performance × Quality

1. Availability

Availability accounts for all events that stop planned production for a significant period (e.g., longer than a few minutes). This includes equipment breakdowns, material shortages, changeovers, and major adjustments. It measures the percentage of time the machine is actually running compared to the time it was planned to run.

• Planned Production Time: The total time the equipment was scheduled to operate.
• Downtime: Any time the equipment was stopped during planned production.
• Operating Time: Planned Production Time – Downtime.
• Availability Formula: (Operating Time / Planned Production Time)

Example: If a machine is scheduled for an 8-hour shift (480 minutes) but experiences 60 minutes of downtime, its operating time is 420 minutes. Availability = 420 / 480 = 0.875 or 87.5%.

2. Performance

Performance accounts for factors that cause the equipment to run at less than its maximum possible speed. This includes minor stops, idling, and slow cycles. It measures how fast the machine is running compared to its ideal speed.

• Ideal Cycle Time: The theoretical fastest time to produce one unit.
• Total Units Produced: The actual number of units produced during the operating time.
• Performance Formula: (Ideal Cycle Time × Total Units Produced) / Operating Time (in consistent units, e.g., seconds)

Example: If the ideal cycle time for a product is 60 seconds per unit, and during 420 minutes (25,200 seconds) of operating time, 400 units were produced. Performance = (60 seconds/unit * 400 units) / 25,200 seconds = 24,000 / 25,200 = 0.9524 or 95.24%.

3. Quality

Quality accounts for manufactured products that do not meet quality standards, including rejects and rework. It measures the percentage of good units produced out of the total units produced.

• Total Units Produced: All units produced (good and bad).
• Good Units Produced: Units that meet quality standards.
• Quality Formula: (Good Units Produced / Total Units Produced)

Example: Out of the 400 units produced, if 380 were good units and 20 were defective. Quality = 380 / 400 = 0.95 or 95%.

How to Use the OEE Calculator

Our OEE calculator simplifies the process of determining your equipment's effectiveness. Simply input the following values:

• Planned Production Time (minutes): The total time your equipment was scheduled to run.
• Downtime (minutes): The total time the equipment was stopped during the planned production time.
• Total Units Produced: The total number of items manufactured.
• Good Units Produced: The number of items that passed quality inspection.
• Ideal Cycle Time (seconds/unit): The fastest possible time it takes to produce one unit.

Click "Calculate OEE" to instantly see your Availability, Performance, Quality, and overall OEE score.

Interpreting Your OEE Score

• 100% OEE: Perfect production (manufacturing only good parts, as fast as possible, with no stop time). This is the theoretical ideal.
• 85% OEE: World-class for discrete manufacturers. This is a challenging but achievable goal.
• 60% OEE: Typical for many manufacturers, indicating significant room for improvement.
• 40% OEE: Common for manufacturers just starting to track OEE, often revealing hidden losses.

A low OEE score isn't necessarily bad news; it's an opportunity to identify and eliminate waste, improve processes, and boost productivity. By understanding which of the three components (Availability, Performance, or Quality) is dragging down your OEE, you can focus your improvement efforts effectively.