Property Comparison Calculator

Compare two properties side by side on net cash flow, net yield and total return, which do not always agree on which is stronger.

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Input
Output

About property comparison calculator

Property Comparison Calculator does its work in front of you rather than sending anything away to be processed. What you see is the whole of it.

The parsing, the maths and the formatting all happen in JavaScript on this page. No request carries your input anywhere, because there is no endpoint for one to reach.

You will find it under Property, alongside 12 other tools for the same sort of job.

Runs in this tab, so nothing you type is uploaded.

How to use it

01
Start it
Every control is on the tool itself. Keyboard shortcuts, where there are any, are listed beside it.
02
Watch it run
It updates in the page as you go. Nothing is sent anywhere, so it keeps working with the network off.
03
Close when done
Nothing is stored between visits. Reloading gives you a clean start rather than picking up where you left off.

Examples

A 180,000 flat against a 220,000 house
The flat yields more, the house produces more cash and a higher total return
Input
aPrice: 180000
aMonthlyRent: 950
aAnnualRunningCosts: 1200
aMonthlyMortgagePayment: 400
aAppreciationPercent: 2
bPrice: 220000
bMonthlyRent: 1300
bAnnualRunningCosts: 1800
bMonthlyMortgagePayment: 650
bAppreciationPercent: 3
Output
A net annual cash flow: 5400
A net yield percent: 3
A total return percent: 5
B net annual cash flow: 6000
B net yield percent: 2.73
B total return percent: 5.73
Higher cash flow: B
Higher yield: A
Higher total return: B

Questions

Does Property Comparison Calculator work offline?+

Yes. It is JavaScript running in this tab, so once the page has loaded it needs nothing further from the network. Put the machine in flight mode and it carries on. Nothing you do here is sent anywhere, because there is nowhere for it to go.

Does it remember anything between visits?+

No. Reload the page and it starts from nothing. There is no account, no saved state and no cookie holding your last session. That is a deliberate trade: it cannot lose your data because it never keeps any.

Is it accurate?+

Timing comes from performance.now(), the high resolution clock the browser provides, rather than from setInterval, which drifts by a few milliseconds every tick and compounds over minutes. What can still shift things is the browser throttling a tab in the background, so leave it visible if the timing matters.

Does it make a sound?+

Where a sound makes sense, it is generated with the Web Audio API rather than loaded as a file, so there is nothing to download and nothing to block. Browsers refuse to start audio until you have interacted with the page, which is why the first press is what switches it on.

Can I use Property Comparison Calculator on a phone?+

Yes. The controls are sized for touch and the layout collapses to one column on a narrow screen. Bear in mind that a phone locking its screen will suspend the page, and timing stops with it.