Landlord Operations & Admin
Free property tools and calculators for UK landlords 2026
Updated April 2026
Running a rental property in 2026 involves more moving parts than it used to. Mortgage costs remain elevated, the Renters' Rights Act came into force on 1 May 2026 reshaping how rent increases and tenancies work, Making Tax Digital is now live for many landlords, and selective licensing schemes are expanding across councils in England. Getting the numbers right is not optional, and doing it accurately in your head or on a rough spreadsheet is increasingly risky.
August has built a suite of 17 free property calculators and tools specifically for UK landlords and property investors. They cover everything from deal appraisal and stamp duty to pro-rata rent, rent increase notices, EPC upgrades, selective licensing checks, and MTD tax estimates. Every tool is free and requires no account or sign-up. You can access all of them at augustapp.com/calculators.
This article explains what each tool does, which landlords it is most useful for, and how it connects to the broader decisions you will face across the lifecycle of a tenancy or property purchase.
Investment calculators
These tools are designed for the due diligence and acquisition phase: assessing whether a deal stacks up before you commit.
Rental yield calculator
Yield is the first filter most landlords apply to any potential purchase. Our rental yield calculator for UK landlords takes the purchase price and expected monthly rent and returns both gross and net yield, allowing you to compare properties side by side on a consistent basis.
Gross yield gives you the headline return before costs. Net yield, once you factor in management fees, insurance, maintenance, and void periods, gives you a more honest picture of what the property will actually deliver. For a detailed breakdown of how both figures are calculated and what counts as a strong yield in different markets, see our guide to what rental yield means for UK landlords.
Rental cash flow calculator
A property can show a respectable gross yield and still leave you out of pocket every month once the mortgage and running costs are deducted. Our rental cash flow calculator lets you model monthly and annual cash flow after all costs, including mortgage repayments, management fees, maintenance reserves, insurance, and void periods.
This is the tool to run before you make an offer, and again whenever your mortgage rate changes or you are considering a significant spend on the property. Understanding your breakeven rent is particularly useful when deciding how much of a shortfall you can absorb during a void.
Buy-to-let mortgage calculator
For most landlords, the mortgage is the single largest cost in the model. Our buy-to-let mortgage calculator lets you compare interest-only and capital repayment structures across different rates, deposits, loan terms, and arrangement fees. You can adjust each variable independently to see how sensitive your monthly payment is to a rate change, especially useful when stress-testing scenarios or deciding whether to fix.
HMO calculator
Houses in Multiple Occupation can generate significantly higher returns than single-let properties, but the costs and compliance burden are also greater. Our HMO calculator runs projected cash flow, gross and net yield, interest coverage ratio tests, breakeven occupancy, and refinance value in a single view. It is the right tool when appraising a property for conversion or assessing whether an existing HMO is genuinely profitable once all compliance, licensing, and management costs are accounted for.
To understand what qualifies as an HMO and whether your property might already be one, see our HMO guide.
Tax calculators
These tools help you understand the tax implications of buying, holding, and managing rental property.
Buy-to-let stamp duty calculator
Stamp Duty Land Tax is one of the largest upfront costs in any property purchase, and the rules are more layered than they appear. Rates vary by region, by whether the property is an additional dwelling, by the buyer's residency status, and by purchase price bracket. Our buy-to-let stamp duty calculator applies the correct rates for England, Scotland, Wales, and Northern Ireland and reflects the changes that came into effect in April 2025.
For a full explanation of the rule changes and how they affect landlords buying now, see our article on the stamp duty changes from April 2025. If you are buying two or more units in a single transaction, also check the Multiple Dwellings Relief calculator below.
Multiple dwellings relief calculator
Multiple Dwellings Relief allows buyers purchasing two or more dwellings in a single transaction to calculate SDLT on the average price per dwelling rather than the total, which can result in a meaningfully lower bill. Our multiple dwellings relief calculator estimates SDLT with and without the MDR method side by side, applies the minimum floor where relevant, and shows the potential saving clearly. It is particularly useful when buying a block of flats, an HMO with an annexe, or any deal structured as multiple units completing simultaneously.
Rental income tax and Making Tax Digital calculator
Making Tax Digital for landlords is now live for those whose qualifying income exceeds the threshold, with further rollout to come. Our MTD landlord tax calculator estimates your property profit, indicates your likely MTD start year, generates quarterly update figures, and shows indicative payments on account.
This is a planning tool rather than a submission tool, but it gives you a useful baseline for conversations with your accountant and helps you understand what your quarterly digital record-keeping will look like in practice.It's hard to stay on top of Making Tax Digital rules and what they mean for your tenancy income. For information about our Making Tax Digital software for landlords see our key feature page.
Landlord mileage calculator
Travel to and from your rental properties is an allowable expense against your rental income, using HMRC's approved mileage rates. Our landlord mileage calculator applies the correct HMRC rates for the current tax year to give you an accurate allowance based on distance travelled, so you are not leaving a legitimate deduction unclaimed or overclaiming in error.
Operations calculators
These tools support the day-to-day management of tenancies: getting rent figures right, assessing tenant affordability, managing move-ins and move-outs, tracking property management costs, and planning maintenance budgets.
Rent increase calculator
From 1 May 2026, rent increases on assured periodic tenancies in England are governed entirely by the Renters' Rights Act 2025. There is now only one legal route, a Section 13 notice served on Form 4A, and landlords must give at least two months' notice, with the increase taking effect on the first day of a tenancy period. Contractual rent review clauses in existing agreements became void on 1 May 2026.
Our rent increase calculator for UK landlords works out your new monthly and annual rent based on either a proposed amount or a percentage increase, and shows the minimum notice date you need to serve to make the new rent effective on your chosen date. It also covers the benchmarks landlords typically use, ONS private rental index, CPI, and local comparable rents, and explains when and how a tenant can challenge an increase at the First-tier Tribunal. For landlords who also need to convert a weekly or four-weekly rent to a monthly equivalent before calculating the increase, use the weekly to monthly rent calculator first.
Property management fees calculator
Most landlords focus on the headline management fee, typically 10 to 12 per cent of monthly rent, but miss the full picture once letting fees, renewal charges, inventory costs, and annual admin fees are annualised correctly. The real cost is often 15 per cent or more of gross annual rent even when the headline rate is 10 per cent.
Our property management fees calculator shows the full annual cost of using a letting agent line by line, set against the cost of self-managing. Adjust the inputs to match your own agent's fee structure and see the annual saving from self-management in seconds. For a deeper breakdown of what agents charge by region and property type, see our guide to average property management fees in the UK.
Pro-rata rent calculator
When a tenant moves in or out part-way through a rental period, the rent for that period must reflect the actual number of days occupied rather than a full month. Getting this wrong is a common source of disputes, and there are two legitimate calculation methods used in UK lettings: the exact calendar month method and the 365-day annualised method.
Our pro-rata rent calculator for move-in and move-out dates supports both methods, covers weekly and four-weekly tenancies as well as monthly, handles leap years, and produces a clear breakdown you can share with the tenant. If you need to convert a weekly or four-weekly rent to a monthly equivalent before running the pro-rata calculation, use the weekly to monthly rent calculator first.
Weekly to monthly rent calculator
Not all rents are set or paid on a calendar-monthly basis. HMO rooms are often let weekly, some tenants on Universal Credit prefer four-weekly payments, and advertising platforms display both weekly and monthly figures. Converting between these accurately requires annualising the figure first, rather than using the common shortcut of multiplying weekly rent by 4.33, which overstates the monthly equivalent.
Our weekly to monthly rent calculator converts accurately between weekly, fortnightly, four-weekly, monthly, quarterly, semi-annual, and annual rent using the correct annualised formula. It also calculates any pro-rata bridging amount when you change payment frequency mid-tenancy. Where that term change creates a partial period at the start of the new cycle, our pro-rata rent calculator can work out the exact bridging amount.
Tenant rent affordability calculator
Before offering a tenancy, it is worth confirming that the applicant's income supports the rent at a ratio referencing agencies would consider sound. Our tenant rent affordability calculator takes the tenant's gross annual income and the monthly rent and returns the income-to-rent ratio, flagging whether it meets the commonly used threshold. It is not a substitute for full referencing but is a useful first filter that can save time and reduce arrears risk before you reach the formal referencing stage.
EPC improvements calculator
Minimum energy efficiency requirements for rental properties are tightening, and many landlords will need to invest in upgrades to meet expected EPC C thresholds for new tenancies. Understanding the cost of those improvements before you budget or approach a lender is essential. Our EPC improvement cost calculator estimates the cost of common measures, ranks them by cost-effectiveness, and shows an indicative monthly finance figure for those considering a green improvement loan. It is most useful when deciding which measures to prioritise, preparing figures for a lender conversation, or assessing whether a property you are buying will require significant post-purchase energy efficiency investment.
For the full picture on your EPC obligations as a landlord, including minimum rating requirements and exemptions, see our EPC guide.
Property inventory calculator
Furnished rental properties require ongoing budgeting for item replacement, but most landlords only think about this reactively. Our property inventory calculator estimates the lifespan and replacement cost of each furnished item, builds a timed replacement schedule, and suggests an annual reserve figure. It is a practical budgeting tool and the output is also useful when explaining to tenants at move-in what the expected condition and lifespan of furnished items is, which can help manage deposit dispute expectations from the outset.
Research and compliance tools
These tools are not calculators in the conventional sense — they are lookup and checker tools that help you understand the compliance landscape and local context around a specific property.
UK property lookup tool
Before committing to a purchase, understanding the local authority context, compliance obligations, and environmental risks associated with a specific postcode can save significant time and money. Our UK property lookup tool takes any UK postcode and returns local authority and ward details, EPC search links, flood risk indicators, broadband and mobile coverage, conservation area flags, nearby amenities including GPs, schools, stations, and supermarkets, and live crime and noise map overlays.
It is a useful first check when researching an area you are less familiar with, particularly when considering a property in a region with active selective or additional licensing schemes. To understand whether your postcode falls within a current selective licensing designation, use the dedicated selective licensing checker below. For guidance on what happens once a licensing obligation is identified, see our guide to selective licensing for landlords.
Selective licensing checker
Selective licensing allows local councils to require that all privately rented properties in a designated area, not just HMOs, are licensed. Schemes vary significantly by council, with different fees, conditions, and geographical boundaries. Operating a licensable property without a licence can result in fines of up to £30,000 and a rent repayment order.
Our selective licensing checker lets you check whether a specific postcode falls within a current selective or additional licensing designation, so you know whether a licensing obligation applies before you let or acquire a property. It is designed to work alongside the UK property lookup tool, which provides broader compliance and local area context for the same postcode. For a full explanation of how selective licensing works, when it applies, and what it requires from landlords, see our selective licensing guide.
How the blog article, calculators index, and individual tool pages work together
The calculators index page is the quickest route if you know which tool you need, it lists all 17 tools with short descriptions and links through to each one. This article is for landlords who want to understand which calculator or tool is right for their situation before running a calculation, or who want an overview of the full toolkit before making a property, tax, or compliance decision. Each tool description in this article links directly to the individual calculator page, where you will find the full methodology, worked examples, and the live tool itself.
Landlords ready to move beyond standalone tools can find a full comparison of the best property management software for UK landlords in our dedicated roundup.
Frequently asked questions
Which calculators should I use first when assessing a new buy-to-let?
Start with the rental yield calculator to get a headline return and filter out properties that clearly do not stack up. If the yield looks viable, move to the rental cash flow calculator to model the deal net of financing and running costs. Run the stamp duty calculator at the same time so you have a full picture of upfront costs before making an offer. If the property is in an unfamiliar area, the UK property lookup tool and selective licensing checker will tell you whether a licensing obligation or compliance risk applies before you commit.
Which tools are most useful for HMO landlords?
The HMO calculator is the primary tool for deal appraisal. For ongoing management, HMO operators will also find the weekly to monthly rent converter and pro-rata rent calculator useful, since room lets are often on weekly terms and move-ins are more frequent than in single-let properties. The selective licensing checker is important for HMO landlords too, since mandatory HMO licensing applies nationally and additional or selective licensing may apply on top depending on the local authority.
How do I calculate a legal rent increase under the Renters' Rights Act?
Use the rent increase calculator, which applies the Section 13 and Form 4A rules that came into force on 1 May 2026. Enter your current rent and proposed new amount or percentage, and the calculator will show the minimum notice date, the new monthly and annual figures, and the pound increase per month. Remember that the increase must be to the open market rent, a proposed increase above market rent can be challenged by the tenant at the First-tier Tribunal.
Do I need an August account to use these tools?
No. Every calculator and tool is free and requires no account, subscription, or sign-up. They are available on demand at augustapp.com/calculators.
Can tenants use any of these tools?
Yes. The pro-rata rent calculator, weekly to monthly rent converter, tenant rent affordability calculator, and rent increase calculator are all useful for tenants as well as landlords, particularly when checking move-in rent calculations, understanding a proposed rent increase notice, or verifying affordability before applying for a property.
How often are the tools updated?
We update the tools whenever relevant rates, rules, or legislation change. The stamp duty calculator reflects the April 2025 changes, the rent increase calculator reflects the Renters' Rights Act rules in force from 1 May 2026, the MTD calculator reflects the current quarterly reporting thresholds, and the mileage calculator uses the current HMRC approved rates. If you spot a figure that looks out of date, contact us via the help centre.
Author
August Team
The August editorial team lives and breathes rental property. They work closely with a panel of experienced landlords and industry partners across the UK, turning real-world portfolio and tenancy experience into clear, practical guidance for small landlords.
