Defining the Functional Components of a Real Estate Investment Calculator - Day 2


Yesterday, we laid the foundation for building a no-code real estate investment calculator. We outlined the problem, established goals, and identified the requirements for selecting no-code tools. Today, we’re diving deeper into the planning phase of the software development lifecycle (SDLC) by breaking down the calculator’s functionality into actionable components and crafting a detailed roadmap for the design phase.

If you missed the earlier blogs in this series:


The Vision for the Calculator

This calculator isn’t just about crunching numbers; it’s about empowering real estate investors to make informed decisions. By combining no-code tools with structured planning, the aim is to create a tool that:

  • Evaluates property viability for BRRRR (Buy, Rehab, Rent, Refinance, Repeat) and fix-and-flip strategies.
  • Offers quick insights into cash flow, principal recapture, passive appreciation, and active appreciation.
  • Provides a seamless, intuitive experience for users.

This blog takes a step-by-step approach to outlining the key functional components and setting a clear path forward.


Functional Components of the Calculator

To ensure the calculator meets its objectives, it needs to support the following inputs, calculations, and outputs:

1. User Inputs

  • Property Information
    • List Price: The purchase price of the property.
  • Income Inputs
    • Monthly Gross Rental Income: Expected rental income per month.
    • Rental Vacancy Rate: A percentage adjustment for potential vacancies, which reduces the gross income.
  • Operating Expenses - Users will input specific expenses to calculate the Total Net Operating Expenses:
    • Property Taxes
    • Insurance
    • Utilities
    • Repairs & Maintenance Reserve
    • Property Management Fees
    • Condo Fees (HOA Fees)
    • Cleaning Costs
    • Gifts (e.g., tenant appreciation)
    • Lawn Maintenance/Snow Removal
    • Other Operating Expenses
  • Financing Inputs
    • Down Payment
    • Mortgage Amount
    • Interest Rate
    • Amortization Period (Years)
    • Monthly Mortgage Payment
    • Second Mortgage or Line of Credit (LOC) Payment
  • Closing Costs - Users will input costs associated with closing the deal:
    • Initial Improvements
    • Building Inspection
    • Appraisal Fee
    • Lender Fees
    • Legal Fees
    • Other Closing Costs

2. Key Calculations

  • Gross Operating Income (GOI)
    • Formula: Monthly Gross Rental Income - (Rental Vacancy Rate * Monthly Gross Rental Income)
  • Net Operating Expenses (NOE)
    • Sum of all operating expense inputs.
  • Net Operating Income (NOI)
    • Formula: GOI - NOE
  • Total Monthly Debt Service
    • Formula: Monthly Mortgage Payment + Second Mortgage/LOC Payment
  • Estimated Monthly Cash Flow
    • Formula: NOI - Total Monthly Debt Service
  • Passive Appreciation
    • Formula: (List Price - Down Payment - Mortgage Amount) * Expected Market Appreciation Rate
  • Cash Required to Close
    • Formula: Down Payment + Initial Improvements + Building Inspection + Appraisal Fee + Lender Fees + Legal Fees + Other Closing Costs
  • Year-One ROI
    • Formula: (Cash Flow + Principal Recapture + Passive Appreciation + Active Appreciation) / Cash Required to Close

Roadmap for the Design Phase

With the functional components defined, it’s time to chart a roadmap for the design phase. Here’s how the process will unfold:

  1. Define the User Interface (UI)
    • Create a modular layout for user inputs, calculations, and outputs.
    • Use design principles to ensure clarity and usability across devices.
  2. Select No-Code Tools: Evaluate platforms based on the project requirements outlined earlier, focusing on tools like Bubble, Glide, Adalo, and Loveable. Each will be tested for their:
    • Ability to handle complex calculations.
    • Flexibility in UI design.
    • Support for automation in testing and deployment.
  3. Incorporate AI-Driven Features
    • Automate suggestions for default values (e.g., average rental vacancy rates or property tax percentages) using AI.
    • Ensure intelligent input validation for accuracy.
  4. Develop an Automated Testing Framework
    • Plan for testing workflows that validate calculations and user interactions.
  5. Plan Deployment
    • Identify hosting options and set up analytics to track usage and gather feedback.
    • Prepare for iterative updates based on real-world performance.


Tomorrow’s Focus: Completing the Planning Phase

The next blog will:

  • Break down the calculator’s UI into actionable sections.
  • Detail how inputs, calculations, and outputs will be organized.
  • Finalize tool selection to transition into the design phase.

This is where the real excitement begins! By the end of the planning phase, we’ll have a clear blueprint to bring this MVP to life using no-code tools. The journey from idea to solution has never been more accessible or innovative.


Don’t Miss Out Bookmark this blog and join me tomorrow as we finalize the planning phase and prepare to design a functional, no-code MVP for real estate investors!

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