Know if a deal works.
Before you commit.
Propell's Deal Calculator gives UK landlords instant ROI analysis, AI-powered property value and rent estimates, mortgage modelling, and cash vs financed comparisons - in under 60 seconds.
- Instant Net ROI, monthly and annual profit
- Side-by-side mortgage vs cash purchase comparison
- AI-powered property value and rent estimates
How to use the Deal Calculator
A quick walkthrough inside Propell.
Try it yourself - instant deal analysis inside Propell.
Calculate your first dealOverview
The Deal Calculator is designed to eliminate guesswork in property investment decisions. It replaces spreadsheets, assumptions, and manual calculations with a fast, accurate, and structured analysis tool built specifically for UK landlords.
- Instant ROI and profit calculations
- Mortgage vs cash purchase comparison
- AI-powered value and rent estimates
How It Works
From address to answer in four steps.
No spreadsheets. No financial modelling degree required. Just enter your numbers and get a clear verdict.
Step 1
Enter the Property
Input the property address or use the Value & Rent Estimate tool to generate figures before committing to a deal.
Step 2
Add Upfront Costs
Include purchase price, legal fees, refurbishment, and furnishing costs. Stamp Duty is calculated automatically, including buy-to-let surcharges.
Step 3
Input Revenue and Expenses
Add rental income, monthly costs, mortgage details, and other ongoing expenses.
Step 4
Get Instant Results
View Net ROI, monthly and annual profit, and a side-by-side comparison of mortgage vs cash purchase scenarios.
Value & Rent Estimate
This feature enables users to assess deals even without complete market data. Input property details and receive estimated property value and rental income instantly.
- Input property details (type, postcode, size, bedrooms, condition)
- Receive estimated property value and rental income instantly
- Transfer estimates directly into the Deal Calculator for full analysis
Key Benefit
Removes dependency on external platforms and enables faster decision-making at early deal stages.
Example Use Case
A £280,000 property with an estimated monthly rent of £1,450
With Mortgage
75% LTV, 5.5% interest rate
Profitable, positive cash flow
Cash Purchase
No mortgage
Lower ROI, stronger monthly cash flow
Insight
While both options are profitable:
- Mortgage strategy delivers a higher ROI (better capital efficiency)
- Cash purchase provides stronger monthly income (better cash flow stability)
The best option depends on your investment goal.
Frequently Asked Questions
Stop guessing. Start calculating.
Every property deal deserves accurate analysis before commitment. The Deal Calculator is available within the Propell platform and can be used immediately.