Rule Of 90 Calculator

Rule Of 90 Calculator calculator can be used to estimate the target date for a project based on 90% completion mark.

Input Parameters

Calculation Results

Calculation Formula

90% Completion Date = Original Target Date + 90% of (Original Target Date - Current Date)

Where:
- Original Target Date: The expected completion date of the project.
- Current Date: The date at which 90% completion is to be estimated.

90% Completion Date

Rule Of 90 Calculator Calculator Usage Guide

Learn how to use the Rule Of 90 Calculator calculator and its working principles

How to Use the Rule Of 90 Calculator

  1. Enter the Original Target Date for your project. This is the expected completion date.
  2. Enter the Current Date. This is the date at which you want to estimate the 90% completion mark.
  3. Click the Calculate button. The calculator will determine the date when 90% of the project is expected to be completed based on the Rule of 90.
  4. If you want to start over, click the Reset button to clear all input fields.

Understanding the Rule of 90

The Rule of 90 is a simplified method to estimate the target date for a project. It assumes that 90% of the work should be completed by adding 90% of the duration from the Original Target Date to the current date. This method is particularly useful for projects where the progress is roughly linear.

Example

Suppose your project is expected to be completed by December 31, 2023, and today is September 1, 2023. To estimate the 90% completion date using the Rule of 90:

  1. Calculate the duration from September 1, 2023, to December 31, 2023: 4 months.
  2. Calculate 90% of this duration: 3.6 months.
  3. Add 3.6 months to September 1, 2023, to get the 90% completion date: Approximately January 15, 2024.

The calculator automates this process and provides the 90% completion date based on the inputs you provide.