What is PropertyBrain?
PropertyBrain is a free hub of UK property investment calculators. Our tools cover everything a buy-to-let investor needs: stamp duty (SDLT/LBTT/LTT), mortgage repayments, rental yield, cashflow, serviced accommodation income, HMO yield and total ROI.
All calculators work instantly in your browser with no signup, no account and no paywall. Enter your numbers, get your results.
The maths behind PropertyBrain
Our calculators use the same models as professional property software:
- SDLT bands from HMRC (updated October 2024, including 5% additional property surcharge)
- LBTT rates from Revenue Scotland (including 6% Additional Dwelling Supplement)
- LTT rates from Welsh Revenue Authority
- Mortgage formula: standard annuity calculation (P × r(1+r)^n / ((1+r)^n − 1))
- Section 24 tax: personal = gross income taxed at band rate, 20% credit on interest
- Ltd Co: net profit (after interest) taxed at 19% corporation tax
Powered by PropertyAlert.uk
PropertyBrain is created by the team behind PropertyAlert.uk — a free live property analysis platform tracking 46,000+ UK listings with instant yield, cashflow and investment score calculations.
PropertyAlert.uk goes further than static calculators: it applies our models to every live Rightmove and Zoopla listing, so you can find and compare real investment opportunities without doing the maths yourself.
Disclaimer
PropertyBrain calculators are for informational and illustrative purposes only. They do not constitute financial, tax or legal advice. Property investment involves risk; capital is at risk and past performance is not a reliable indicator of future results. Always consult a qualified financial adviser, tax adviser and solicitor before making investment decisions.