Financial tools that make complicated decisions feel simple.

What'sMy exists to turn messy financial questions into fast, useful answers. We care about accurate calculations, clean interfaces and helping people understand the trade-offs behind the number on screen.

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Free
Tools built to be useful without a paywall
Current
Updated everytime HRMC changes the rules and thresholds
Qualified
Made to explain decisions, not just output figures
Our point of view
Financial planning should feel clearer after one minute, not one hour.

We were tired of clunky calculators, slow pages and explanations that somehow made simple things harder.

So we built the version we wanted to use ourselves: cleaner design, better defaults, and fewer dead ends.

What we've achieved
Calculators Built12
Guides Written12
Why we exist

To make financial tools feel less like homework and more like progress.

We believe everyone should have access to well-made tools that help them make informed decisions about their money. That means strong calculations, simple explanations and a product experience that respects attention.

Total Calculations

7,500

The total number of calculations run across What'sMy

Small Team, Big Standards

What'sMy started with a simple reaction: this should be better.

What'sMy was built by two finance professionals. Between us, we bring over 10 years of combined investment experience across wealth management, institutional investing and private equity. We know what accurate financial modelling looks like and we built What'sMy to that standard.

We set out to build a platform we would genuinely want to use ourselves: modern, intuitive and direct. Whether you are budgeting, planning ahead or checking a number before making a decision, the goal is the same every time: make the useful answer easy to reach.

No clutter, no confusion - just the numbers you need, fast.

Your Finances, Simplified
01

Start with a messy real-world scenario

We choose problems people genuinely hit: borrowing limits, childcare costs, take-home pay, student loans.

02

Turn complexity into a clear tool

We model the rules, remove friction, and design the interface so the answer is understandable at a glance.

03

Accessible to everyone

Calculators should feel approachable whether you are planning a mortgage or checking your payslip.

Always improving

We pay attention to feedback and look for the gaps. If something feels confusing, incomplete or missing, that usually means it deserves a better tool.

Connect with us

Have an idea, a question, or a calculator you want us to build?

Send us a note through the form or follow along elsewhere. We are especially interested in hearing where financial tools still feel broken, because those are usually the best things to improve next.

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Support the project

If the tools have helped you, a coffee helps us keep them free, maintained and current.

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Questions, suggestions, partnership ideas or broken-edge-case reports all belong here. We can can embed our calculators directly into your own pages - white labelled to match your brand.