Synoria AI CorporationAutonomous software company
Accounting & Finance

RentYield UK — Buy-to-Let Yield & ROI Calculator

RentYield UK helps UK property investors quickly evaluate whether a buy-to-let property is worth purchasing. It calculates key financial metrics like gross yield, net yield, annual cash flow, and cash-on-cash ROI based on the property price, rent, mortgage, and running costs. This replaces manual spreadsheet work and provides instant clarity on a property's potential returns.

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The tool is designed for UK buy-to-let landlords and property investors who need to assess the financial viability of a specific property before making a purchase decision.

How it works

  1. Enter the property purchase price, expected monthly rent, deposit amount, and mortgage interest rate.
  2. Select the loan type (Fixed or ARM) and whether the mortgage is interest-only, then input running costs such as service charge, management fee percentage, CapEx reserve, and other expenses.
  3. Click Calculate to instantly see gross yield, net yield, annual cash flow, and cash-on-cash ROI, all rounded to two decimal places.
  4. Save the property analysis to your history, and view a side-by-side comparison table of all saved properties' key metrics.

What you gain

  • Instant calculation of key buy-to-let metrics
  • No need for complex spreadsheets
  • Includes running costs for a realistic cash flow model
  • Save and compare multiple properties side by side
  • Simple, no sign-up required

Screenshot

RentYield UK — Buy-to-Let Yield & ROI Calculator

Technical details

Standard24.99 USD · 1500 requests · 31-day license · one-time payment · 31-day access
Pro49.98 USD · 6000 requests · 31-day license · one-time payment · 31-day access
Isolationdedicated instance per license
Usage meteringLLM usage metered per license
Accessweb sign-in with license key

How to set up & use

  1. Buy the license — your key (lic_...) appears on the order page and in your email.
  2. Sign in at app.synoriaai.com with your license key.
  3. No installation — the product runs in your browser, on your own isolated instance.
  4. Enter the property's purchase price, monthly rent and deposit percentage
  5. Enter mortgage details: interest rate, loan type, interest-only choice and term
  6. Enter running costs: service charge, management fee %, CapEx reserve and other expenses
  7. Click Calculate to see gross yield, net yield, cash flow and ROI
  8. Click Save Property to add it to your comparison list

Frequently asked questions

Where is my data stored?

Everything you save stays on the server running this tool in a single data file. It is not shared with any third party.

Does this connect to my bank or mortgage lender?

No. You type in the numbers yourself; the tool only calculates and stores what you enter.

Can it read a property listing or photo automatically?

No, all figures (price, rent, costs) must be entered manually — there is no photo or listing import.

With USDT or USDC stablecoins on one of the payment networks shown at checkout. You scan a QR code with the exact amount pre-filled — no card and no wallet connection is required.
The payment is detected on-chain and matched to your order by its unique amount. After confirmations complete, your license key is generated and your own product instance is prepared; the order page updates by itself.
No. You make a one-time stablecoin payment for a 31-day license with a fixed request quota. There is no auto-renewal — to keep using the product, you simply purchase again.
Each plan includes a fixed number of requests for the license period. A small overage allowance is defined beyond that; once it is used up, requests pause until a new license is purchased.
Yes. Every license runs in its own isolated instance with its own data directory — customers never share an instance or data.
On-chain payments are never lost. Keep your order number and contact support; the payment can always be matched to your order.
Each product is built for its target market and uses that market's language; this storefront is available in 9 languages.

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