How to Write a Good Conclusion For a Lab Report

Crafting a compelling conclusion for your lab report involves distilling the experiment’s essence without introducing novel concepts. Unlike other academic compositions, brevity is key. As you master this art, emphasize the experiment’s primary intent and assess the degree of goal accomplishment.

Regarding length, typical assignments demand a concise 200-300-word paragraph, encapsulating pivotal summaries and succinct dialogues. Occasionally, reports might extend to 500 words, but maintaining conciseness is crucial, unless for analytical or explanatory purposes. Remember, novelty isn’t the aim here; it’s a recapitulation.

A well-crafted conclusion reinforces the experiment’s purpose and verifies objective attainment. This section should highlight the experiment’s relevance, summarize key findings, and establish their implications. Avoid introducing unexplored territories, and sticking to known data. Conclude by acknowledging achieved objectives and their significance in advancing understanding. In closing, your lab report conclusion bridges the experiment with its purpose, aligning your readers with the study’s journey and outcomes.

Elements of a Good Lab Report Conclusion

Stated below are the key elements of a proper conclusion for a lab report:

1. Reminder of Objectives and Research Purpose

In crafting an impactful conclusion for a lab report, it’s essential to begin by revisiting the objectives outlined in the experiment. Remind readers of the initial goals that guided your research. This concise recap serves as a compass, steering them back to the focal points you aimed to address. A well-crafted reminder in this section lays the foundation for understanding the significance of your findings.

2. Recap of Methods and Achievements

In this succinct segment, briefly outline the methodologies employed in the experiment and highlight the outcomes you’ve attained. Avoid delving into exhaustive details; instead, offer a clear snapshot of the techniques and procedures employed to reach the obtained results. This component of your conclusion succinctly bridges the gap between your research design and its tangible outcomes.

3. Key Findings and Outcomes

Distil the core findings from your experiment into this section. Present the crucial discoveries and results that emerged from your research efforts. By encapsulating the essential takeaways, you offer readers a concise overview of the knowledge gained through your investigation. This element serves as a critical junction where your conclusions crystallize, encapsulating the essence of your experiment’s contributions.

4. Analytical Remark or Addressing Limitations

The final section of your conclusion can take one of two routes. For a closing analytical remark, briefly delve into the broader implications of your findings. Touch on how your results fit into the existing body of knowledge or suggest potential avenues for further exploration. Alternatively, if applicable, candidly discuss limitations encountered during the experiment. Addressing constraints not only demonstrates transparency but also acknowledges the complexity inherent in scientific inquiry.

As a complementary touch, consider including a recommended reading list that aligns with your experiment’s subject matter. This offers readers the opportunity to deepen their understanding and explore related literature independently. Remember, while your conclusion should highlight findings, it should refrain from proposing solutions. Instead, it acts as a summative reflection on the experiment’s objectives, methods, findings, and potential implications.

By adhering to these distinct elements within your lab report conclusion, you can create a well-structured, insightful, and informative wrap-up that resonates with your readers, effectively conveying the significance and outcomes of your research.

A Guide on How to Write A Lab Conclusion

Writing a lab conclusion is an important skill for any science student. A lab conclusion summarizes the main findings and implications of an experiment and provides recommendations for future research. In this guide, we will explain how to write a lab conclusion using the following elements:


The purpose of the lab conclusion is to restate the main question or problem that the experiment aimed to address and to briefly summarize how the experiment answered or solved it. 

For example:

The purpose of this experiment was to test the effect of different concentrations of salt on the growth of bean plants. The results showed that increasing the salt concentration reduced the plant height, leaf area, and dry mass.


The methods section of the lab conclusion provides a brief overview of the experimental design and procedures that were used to collect and analyze the data. 

For example:

The experiment was conducted using a randomized block design with four treatments: 0%, 0.5%, 1%, and 2% salt solutions. Each treatment was replicated three times, and each replicate consisted of five bean plants grown in pots. The plants were watered with the assigned salt solution every two days for four weeks. The plant height, leaf area, and dry mass were measured at the end of the experiment.


The results section of the lab conclusion presents the main findings of the data analysis, using tables, graphs, or statistics as appropriate. 

For example:

The results indicated that there was a significant effect of salt concentration on the plant growth parameters.


The discussion section of the lab conclusion interprets the results concerning the research question or problem and explains the underlying mechanisms or causes of the observed effects. 

For example:

The discussion section should also compare and contrast the results with previous studies or literature, and identify any limitations or sources of error in the experiment. 

For example:

The results of this experiment are consistent with previous studies that have reported negative effects of salt stress on plant growth (Smith et al., 2010; Jones et al., 2012). One possible explanation for these effects is that high salt concentrations reduce the water potential in the soil, making it harder for the plants to absorb water and nutrients (Zhang et al., 2014). Another possible explanation is that high salt concentrations cause osmotic stress and ion toxicity in plant cells, affecting their metabolism and photosynthesis (Liu et al., 2016).

One limitation of this experiment is that it only tested four levels of salt concentration, which may not reflect the range of conditions that plants encounter in natural or agricultural environments. Another limitation is that it only measured three parameters of plant growth, which may not capture all aspects of plant health or productivity.


The conclusion section of the lab conclusion provides a concise summary of the main findings and implications of the experiment and suggests directions for future research or applications. For example:

In conclusion, this experiment demonstrated that increasing salt concentration had a negative effect on the growth of bean plants, reducing their height, leaf area, and dry mass. This suggests that bean plants are sensitive to salt stress, and may not be suitable for cultivation in saline soils or irrigation with saline water. Future research could explore ways to improve the salt tolerance of bean plants, such as breeding, genetic engineering, or agronomic practices.

What to Include in a Conclusion for a Lab Report

A conclusion is a section of a lab report that summarizes the main findings and implications of the experiment. It is usually the last part of the report, and it should answer the following questions:

  • What was the purpose of the experiment?
  • What were the main results and how do they compare to the expected or predicted outcomes?
  • What were the sources of error and uncertainty and how did they affect the results?
  • What are the limitations of the experiment and how could they be improved in future studies?
  • What are the broader implications or applications of the experiment for the field of study or society?

A conclusion should be concise, clear and logical. It should not introduce new information or repeat details that have already been discussed in the introduction or methods sections. It should also not include personal opinions or subjective interpretations of the results. A conclusion should be based on facts and evidence from the experiment.

A good conclusion should follow this general structure:

  • Restate the main objective or question of the experiment in one sentence.
  • Summarize the main results and explain how they relate to the objective or question.
  • Discuss the sources of error and uncertainty and how they affected the results. If possible, quantify the error or uncertainty using statistics or calculations.
  • Identify the limitations of the experiment and suggest ways to improve them in future studies.
  • Explain the significance or relevance of the experiment for the field of study or society. If applicable, provide recommendations or suggestions for further research or action.

Examples of a Conclusion of a Lab Report

Here is an example of a conclusion for a lab report on measuring the acceleration due to gravity using a pendulum:

Example 1: A conclusion of a lab report on measuring the acceleration due to gravity using a pendulum:

The purpose of this experiment was to measure the acceleration due to gravity (g) using a simple pendulum. The experimental value of g was found to be 9.81 ± 0.02 m/s^2, which is consistent with the accepted value of 9.81 m/s^2. The main sources of error and uncertainty were human reaction time, air resistance, friction and measurement errors. These errors could be reduced by using a digital timer, a vacuum chamber, a smoother pivot and more precise measuring instruments. The experiment demonstrated the basic principles of pendulum motion and its application to determine g. The experiment also showed how to use experimental data to calculate g using mathematical formulas and how to estimate the uncertainty of g using error propagation. The experiment could be extended by varying the length, mass or amplitude of the pendulum and observing how they affect g.

Example 2: Conclusion of a Lab Report on Enzyme Activity

The purpose of this lab was to investigate the effect of temperature on the rate of enzyme activity. The hypothesis was that the rate of enzyme activity would increase as the temperature increased, until a certain point where the enzyme would denature and lose its function. The results supported the hypothesis, as the enzyme activity increased from 10°C to 40°C, and then decreased sharply at 60°C. The optimal temperature for the enzyme was 40°C, where it had the highest rate of activity. This lab demonstrated that temperature is an important factor that affects enzyme activity and that enzymes have a specific range of temperatures where they function best.

Example 3: Conclusion of a Lab Report on Osmosis

This lab aimed to observe the process of osmosis in plant cells and to determine the solute concentration of potato cells. The hypothesis was that the potato cells would lose water and mass in solutions with higher solute concentrations than their own, and gain water and mass in solutions with lower solute concentrations than their own. The results confirmed the hypothesis, as the potato cells lost mass in solutions with higher solute concentrations (0.4 M and 0.6 M sucrose) and gained mass in solutions with lower solute concentrations (0.0 M and 0.2 M sucrose). The solute concentration of potato cells was estimated to be around 0.3 M, as the potato cells did not change mass in this solution. This lab showed how osmosis occurs in plant cells and how it affects their mass and water potential.

Example 4: Conclusion of a Lab Report on Acid-Base Titration

The objective of this lab was to determine the concentration of an unknown acid solution using a standard base solution and a pH meter. The hypothesis was that the concentration of the unknown acid solution could be calculated by using the formula M_a V_a = M_b V_b, where M_a and M_b are the molarities of the acid and base solutions, and V_a and V_b are the volumes of the acid and base solutions used in the titration. The results verified the hypothesis, as the concentration of the unknown acid solution was found to be 0.102 M, by using the average volume of base solution (25.3 mL) and the known molarity of base solution (0.100 M). This lab illustrated how acid-base titration can be used to measure the concentration of an unknown solution using a known solution and a pH meter.

Bottom Line

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