Regra Pareto (80/20)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The Pareto Rule (80/20) calculator helps identify 20% of your efforts that generate 80% of results. Based on Vilfredo Pareto's principle, this tool prioritizes tasks, resources, or actions with the highest impact in a given scenario. It operates on the idea that uneven distribution often dominates outcomes: most results stem from a minority of causes.
To use, list all your tasks or actions and assign an impact value to each. The calculator analyzes the data and highlights the 20% contributing to 80% of the expected result. This analysis is particularly useful for time management, productivity, and strategic decision-making.
Applicable in work, studies, or personal projects, the rule helps focus on essentials. However, remember it's not a rigid formula. Complex contexts may require adjustments to the 80/20 ratio, and the tool should be used with discernment.
Cautions: Avoid oversimplifying situations with multiple variables. The 80/20 rule is a guideline, not an absolute truth. Assess whether the impact criteria assigned reflect reality, especially in interdependent tasks or those with side effects.
Frequently asked questions
Why does the 80/20 rule work in real life?
It reflects natural patterns of uneven distribution in complex systems. For example, 20% of tasks in a project may generate 80% of revenue or progress due to factors like synergies or chain reactions.
Does the calculator consider only time spent?
No. It analyzes proportional impact. Tasks requiring little time but yielding high results are prioritized, while time-consuming low-return tasks are flagged for review.
How to handle tasks outside the 20% priority?
Don't discard them. Reduce their negative impact (e.g., automation), limit time invested, or delegate. Some cases require keeping these tasks to maintain balance.
Is the 80/20 rule fixed or can it vary?
The 80/20 ratio is a guideline. In some contexts, the focus might be 10/90 or 30/70. The calculator adapts but prioritizes identifying significant inequalities.