Free calculators for UK Landlords.

We’ve created a selection of free calculators for UK landlords to use. Determine your monthly mortgage payments, net worth, rental yield and more.

Illustration of two yellow houses with a tree between them
Featured Calculator

Open Market Rent Calculator

Free UK open market rent calculator built on ONS and Property Data. Check local market rent and build defensible evidence for a Section 13 rent increase.

Rent to income Ratio (Free Calculator for Landlords)

Check whether a tenant can afford the rent against the 30x rule letting agents use, or set your own percentage. Add a guarantor to see whether they cover the shortfall, and work out the highest rent an income supports.

Buy-to-Let Mortgage Calculator

Estimate your monthly buy-to-let mortgage payments on an interest-only or repayment basis, and check whether your rent passes the lender's ICR stress test.

Stamp Duty Calculator

Work out the stamp duty you'll owe on a UK property purchase, whether you're buying a buy-to-let, a second home, a first home or a portfolio. Covers England, Northern Ireland, Wales and Scotland.

Rental Yield Calculator

Work out the gross and net yield on a rental property, factor in void periods and running costs, and see what your investment really returns.

Rental Income Tax Calculator

Landlord earning rental income from a tenant in your home or a buy-to-let property? Quickly calculate how much you can expect to pay in rental income tax.

Open Market Rent Calculator

Free UK open market rent calculator built on ONS and Property Data. Check local market rent and build defensible evidence for a Section 13 rent increase.

Mileage Tracking Calculator

Log every business journey from inspections, and contractor visits, to viewings and DIY stops. Calculate the driving distance automatically, then apply HMRC's flat mileage rate (55p/mile for the first 10,000 miles) to see your total deduction. Download a tax-ready PDF in three clicks.

Helpful articles

stressed landlord in the kitchen
Making Tax Digital

Missed Your MTD Quarterly Update? How to Catch Up

Missed your first MTD quarterly update? Your Q2 update can cover both quarters. How to catch up on any missed quarter, and when HMRC penalty points apply.

Ryan Green

Updated

October 1, 2026

Ryan Green

Updated

October 1, 2026

Landlord Tenant Law

Joint vs Individual Student Tenancies: Which Is Safer Under the Renters’ Rights Act?

One student can end a joint tenancy for the whole house. How joint and room-only agreements compare on Ground 4A, council tax, rent increases and turnover risk.

Ryan Green

Updated

September 1, 2026

Ryan Green

Updated

September 1, 2026

students talking to landlord
Landlord Tenant Law

Student Possession Under the Renters’ Rights Act (Ground 4A Guide)

Ground 4A is how student landlords recover a HMO for the summer changeover. The five conditions, the four-month notice timing, and the six-month signing trap.

Ryan Green

Updated

August 31, 2026

Ryan Green

Updated

August 31, 2026