How to Calculate Task Completion Rate

Task Completion Rate Calculator

Measure user success and efficiency by calculating the Task Completion Rate (TCR).

Task Completion Rate:

0%

function calculateTCR() { var completed = parseFloat(document.getElementById("tasksCompleted").value); var attempted = parseFloat(document.getElementById("tasksAttempted").value); var resultDiv = document.getElementById("tcr-result"); var percentageDisplay = document.getElementById("tcr-percentage"); var interpretationDisplay = document.getElementById("tcr-interpretation"); if (isNaN(completed) || isNaN(attempted) || attempted attempted) { alert("Completed tasks cannot exceed total attempted tasks."); return; } var tcr = (completed / attempted) * 100; var roundedTCR = tcr.toFixed(2); resultDiv.style.display = "block"; percentageDisplay.innerHTML = roundedTCR + "%"; var interpretation = ""; if (tcr >= 90) { interpretation = "Excellent! High user success and efficient workflow."; percentageDisplay.style.color = "#27ae60"; } else if (tcr >= 70) { interpretation = "Good. Minor friction points may exist in the process."; percentageDisplay.style.color = "#2980b9"; } else if (tcr >= 50) { interpretation = "Average. Significant room for usability improvements."; percentageDisplay.style.color = "#f39c12"; } else { interpretation = "Needs Attention. High failure rate suggests major usability issues."; percentageDisplay.style.color = "#e74c3c"; } interpretationDisplay.innerHTML = interpretation; }

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Understanding Task Completion Rate (TCR)

The Task Completion Rate, often referred to as "Success Rate," is a fundamental metric in User Experience (UX) research and project management. It measures the percentage of users who are able to successfully finish a specific task within a given context, such as a website checkout, a software feature, or an industrial workflow.

The Task Completion Rate Formula

Calculating the completion rate is straightforward. Use the following mathematical formula:

TCR = (Successfully Completed Tasks ÷ Total Tasks Attempted) × 100

Key Components of the Calculation

• Successfully Completed Tasks: The number of times a task was finished without fatal errors or the user giving up.
• Total Tasks Attempted: The total number of users who started the task or the total number of attempts recorded.

Why is TCR Important?

TCR is a binary metric (success or failure) that provides an objective look at performance. While it doesn't explain why a user failed, it clearly indicates where the failure occurs. It is commonly used to:

• Benchmark a product against competitors.
• Identify "roadblocks" in a conversion funnel.
• Track improvements before and after a design overhaul.
• Justify ROI for UX investments.

Example Calculation

Suppose you are testing a new mobile app registration flow. You have 200 users start the registration process. Out of those, 150 successfully create an account, while 50 drop off or receive errors they cannot fix.

Calculation: (150 / 200) = 0.75. Then, 0.75 × 100 = 75%.

A 75% Task Completion Rate suggests that while most users succeed, 25% are experiencing friction that prevents them from converting.

What is a "Good" Completion Rate?

While industry standards vary, a generally accepted benchmark for usability testing is 78%. However, if the task is critical (like "paying a fine" or "submitting a medical form"), the goal should always be as close to 100% as possible. For complex, first-time tasks, lower rates are common and expected during early testing phases.