Time Estimation: Your Guide to Accurate Project Management

In project management, time management is of paramount importance. One of the most critical aspects of time management is time estimation. If you are wondering how to estimate time for a project, you’ve come to the right place.

In this article, we’ll discuss time estimation in project management, its importance, and the various methods and techniques that can accurately estimate a project’s time. One foundational strategy to help you estimate time accurately is time-tracking. Further, we see why.

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Whether you are a seasoned project manager or new to the field, this article will provide you with all the information you need to effectively manage your time and ensure the successful completion of your projects.

What is time estimation in project management?

Time estimation is figuring out how long a project or task will take. It’s important for project management because it helps managers plan and assign resources effectively. The better you know the details and complexities of the work, the more accurate your estimates will be.

To calculate the overall time needed for a project, the following questions should be answered:

  • How much work is it? Create a detailed work breakdown structure and list your team’s key tasks to achieve project milestones and deliverables.
  • How long will it take to complete it?: Evaluate how long each project activity will take in terms of hours, days, or weeks, and add up the individual estimates to obtain the total time required to complete the project.

It’s important to note that time estimation is a crucial aspect of initial project planning, and in conjunction with other planning techniques, it helps to:

  • Establish realistic project expectations;
  • Anticipate potential risks;
  • Streamline processes;
  • Focus on priorities from the very beginning.

Why is time estimation important? 

Time estimation is a critical aspect of project planning and management, enabling teams to accurately predict the amount of time required to complete a task or project.

This information is crucial for effectively allocating resources, predicting costs and managing budgets, establishing realistic timelines, and identifying potential risks and issues.

Estimate how long your tasks take

“Timeluar has helped my workflow and given me great data for how much time I spend on each type of project. I love how simple it is to use” – Heather M.

Learn everything you need about the project’s lifecycle in our post.

Advantages of time estimation in project management

Setting realistic expectations

One of the primary advantages of time estimation is that it allows teams to set realistic project expectations.

By understanding the scope of the work and the amount of time required to complete it, teams can establish clear timelines and realistic project management goals. This helps ensure everyone is on the same page and working towards the same objective. 

Managing expectations is also essential for customer relations. One of the most common reasons customers end up dissatisfied with a company is the slippage of time estimates. 

TIP: Read our guide and learn how to create project timelines

Identifying potential issues

Another benefit of time estimation is that it enables teams to anticipate potential risks and issues.

By understanding the time required to complete each task or activity, teams can identify potential bottlenecks and areas where delays may occur. This allows them to proactively address these issues and mitigate their impact on the overall project timeline.

Read our guide about project risk management.

Efficient resource allocation

Time estimation can also help teams to streamline processes and optimize resource allocation.

By understanding how long different tasks and activities will take, teams can determine the most efficient order to complete them. This allows them to maximize their resources and minimize wasted time and effort.

Get to know the difference between efficiency and efficacy.

the word COST in wooden blocks

Preventing cost overruns

Proper time estimation is critical for effectively allocating resources, establishing realistic timelines, and identifying potential risks and issues. This allows them to proactively address these issues and mitigate their impact on the overall project timeline, thus avoiding cost overruns by delays.

All this helps managers ensure that the project is completed on time and within budget, avoiding cost overruns and ensuring project success.

Read our guide and learn how to manage a project budget.

Time estimation matters for everyone

The clock is always ticking for everyone! As such, time estimation is important for a wide range of individuals and organizations in various contexts.

For project managers and team leaders

Time estimation is crucial for effectively planning and managing projects.

It allows them to establish realistic timelines, allocate resources, and identify potential risks and issues. This helps ensure the project is completed on time and within budget.

TIP: Choose a project management course and learn how to use time estimation in PM.

For business owners and executives

Making informed decisions about resource allocation and project prioritization is of utmost importance for business owners.

By understanding the amount of time required to complete different tasks and activities, they can determine which projects are most critical and should be given priority.

How much time does your team spend on each project?

“Since we started using Timeular and tracking our time, we’ve never made another mistake in planning, creating accurate proposals or budgeting for clients. It’s so easy to use. Everyone uses it and it shows” – AC Coppens, Founder of THE CATALYSTS

a team of four people estimating time for a project

For employees and team members

Time estimation is important for employees to effectively complete their tasks and contribute to the project’s overall success.

By understanding the amount of time required to complete their work, they can plan their time and prioritize their tasks accordingly.

Find the best prioritization techniques to avoid damaging your project.


In different contexts, time estimation is also essential for different industries and fields such as construction, software development, event planning, product development, and many more.

For example, accurate time estimation in construction is crucial for avoiding delays and cost overruns.

In software development, accurate time estimation is critical for delivering products on time and within budget.

In event planning, time estimation is important for ensuring everything runs smoothly and on schedule.

How to estimate time for a project accurately

By now, you already know that an accurate estimation of the time required for a project is essential for successful project management. But we bet you’re wondering how to do it.

Here’s how to estimate the time for your projects and their associated tasks with precision.

  • Track your and your team’s time. When you track how long your team members need to accomplish a task, you collect precious knowledge for future estimates. Tracking time helps you to do better future estimates.
  • Identify the project scope: Create a detailed list of all the tasks involved to ensure nothing is missed.
  • Apply an appropriate estimation technique: Review the available techniques and choose the one that best suits your project.
  • Include revision hours: Don’t forget to add extra time for review and revisions.
  • Hope for the best, but plan for the worst: Add a contingency buffer by rounding up your time estimate to account for potential risks.
  • Combine all time estimates: Add all the task, revision, and contingency estimates to get your first overall project estimate.
  • Review and finalize the estimate: Review the estimate with your team and any relevant tools to ensure it is realistic and achievable. Make any necessary revisions.

What does a project manager do? Get to know the different project manager roles and responsibilities in our guide.

The best time estimation methods

Time estimation is essential for project management, but it can be tricky! How do you know how long a task will take to complete? Or how much time to budget for a project? Next, we’ll explore some of the most common time estimation techniques that can help you create more accurate estimates for your projects.

Timeular tracking app

Time tracking software

Is time tracking effective? Yes, time tracking is a way of accurately tracking how much time you spend on tasks. To increase your accuracy and better estimate time, you can use a time-tracking software.

Time tracking software is a valuable tool for project management as it helps to improve time estimates. It records time spent on tasks and provides powerful reporting capabilities that allow you to analyze the data and make more accurate estimates. It can also help you identify patterns and trends that can be used to make more accurate time estimates in the future.

Additionally, it allows you to measure your progress through a given task against your time estimates, enabling you to better manage your time and keep your project on track. Overall, accurate time tracking improves efficiency and helps you make better use of your time.

Track time accurately with zero effort

“Since we started using Timeular and tracking our time, we’ve never made another mistake in planning, creating accurate proposals or budgeting for clients” – AC Coppens, Founder of THE CATALYSTS

Historical data

One of the easiest ways to estimate time is to look at past projects and see how long similar tasks took to complete. This is known as using historical data.

It can be beneficial for repetitive tasks or projects that follow a similar pattern. By looking at how long it took to complete a task in the past, you can get a better idea of how long it will take in the future.

If you use time-tracking software, you can go through the history of similar projects and check how long each task took.

Don’t forget to also consider mistakes you’ve made in the past, especially if the initial time estimation was insufficient.

a team looking to time historical data

Bottom-up method

The bottom-up method is a time estimation technique that involves breaking down a project into smaller, more manageable tasks. Once you’ve identified all the tasks, you can then estimate how long each one will take to complete and add it all. This can be a more accurate way of estimating time because it allows you to consider all the small details that might be overlooked in other techniques.

This technique is recommended when there’s a lack of historical data to make informed estimates for the entire project. It’s important to remember that the margin of error for individual estimates can accumulate and impact the reliability of the overall estimate. This means the method may not be as accurate as one that uses more historical data. Use it wisely!

Top-down method

The top-down method is the opposite of the bottom-up method. Instead of breaking a project down into smaller tasks, you start with an overall estimate and then work your way down to the individual tasks. This technique can be useful when you’re dealing with a project that’s too large or complex to estimate with other methods.

This method can be more accurate than the bottom-up method, but it relies on having sufficient information and experience to make informed estimates. It’s most effective when there is a lot of previous experience on which to base the estimates on.

two people looking at charts to estimate time

Expert judgment

Finally, there’s the expert judgment method, which involves consulting with people with experience and knowledge in the project area. This could be a team member, a manager, or an external consultant. They can give you an estimate based on their experience and expertise, which can be more accurate than estimates based on other methods.

Consulting an expert can also provide added benefits! Not only will they have valuable advice for the project as a whole, but they may also be able to identify issues that have affected similar projects in the past. It will provide an extra layer of insight and can help you avoid potential mistakes.

Regardless of your chosen technique, it’s important to remember that time estimation is not an exact science. There will always be some level of uncertainty involved. However, by using a combination of these techniques and continuously monitoring and adjusting your estimate as needed, you can improve the accuracy of your time estimates and increase the chances of project success!

Tips to improve your time estimation

Unfortunately, many people struggle with time estimation and either underestimate or overestimate the time required to complete a project.

Next, we’ll discuss several tips for improving your time estimation skills. These tips help you better manage your time and complete your projects on time and within budget.

Track your time, seriously

You can’t manage what you can’t measure. Whether you opt for time-tracking software or another method, make sure you track your time. This will be useful so that later on, you can consult the data of past projects, analyze it, and make more accurate estimates in the future.

You can even use Gantt charts to visualize the estimates and compare them with real-time tasks.

Turn time tracking into a task so easy that your team will even enjoy it

“People complain a lot less about time tracking now because of the easy interface of Timeular. It’s made time tracking a lot less of an obstacle and much more accessible” – Kaitlin Snow Seamons, Executive Creative Director at Harmon Brothers

Use estimation methods consistently

Consistency is key when it comes to time estimation. Using the same method consistently will help to improve accuracy over time. Additionally, it takes several tries with a method until you understand whether it’s right for you.

Estimate during the low point of your day

According to Daniel H. Pink’s book “When: The Scientific Secrets of Perfect Timing”, our internal clocks not only affect when we feel most energetic and focused but also when we are most likely to feel creative, positive, or negative.

In the book, Pink cites a study that analyzed people’s moods using data from millions of Twitter messages. The data showed that people tend to be less positive when they hit their low point of the day, which Pink calls “the trough”. Therefore, estimating during your low point of the day is best, as it can provide a more realistic and accurate estimation.

an iPhone tracking time in a table. The table has also a macbook, glasses, coffee and clock in a table

Have someone else estimate for you

Instead of attempting to estimate tasks on your own, consider seeking a colleague’s input.

Often, when estimating our abilities to complete tasks, we tend to be overly optimistic about the time it will take. However, when considering the estimates of others, we tend to be more realistic and pragmatic.

This will increase your estimates’ accuracy and improve team members’ collaboration.

two people analyzing reports

Create project reports

After completing the project, create a project report to document what went well and what could be improved for future projects.

Use the data and insights from this project to make more accurate time estimates for future projects. This way you will avoid making the same mistakes!

Create an effective schedule for team members

Creating an effective employee schedule is a pivotal strategy for aligning time estimations with actual outcomes.

By thoughtfully allocating tasks to the right employees based on their skills and efficiency levels, a well-structured schedule minimizes the risk of time overruns.

Such schedules also enable the distribution of tasks, preventing excessive workloads and burnout and ensuring tasks are completed within their estimated time frames.


What are the different time estimation methods?

There are several estimation methods that you can use to get accurate time estimations. Some of the most famous are: Historical data, Bottom-up method, Bottom-down method, and Expert judgment. Also, consider using time-tracking software.

How do you make an accurate estimate of time?

To make an accurate time estimate, you should break down the project into smaller tasks and estimate with the help of expert input or by checking historical data of similar projects. To keep this record up to date, we advise you to use a time-tracking tool.

How long does an estimate take?

The duration of an estimate varies depending on the complexity of the project and the method used. A rough estimate can take as little as a few minutes, while a more detailed estimate may take several hours or even days.


Time estimation is a critical aspect of project management and is essential for completing any project.

By understanding the importance of time estimation, the various methods and techniques that can be used, and the tips to improve time estimation, project managers can ensure that their projects are completed on time and within budget. 

Always consider risks and unknowns, use project management tools, and continuously monitor and adjust the schedule as needed.

Using a systematic approach, you can improve your time estimation skills and increase your chances of success!

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