About FinCalcHub

A free personal-finance calculator hub for the USA, UK, and South Africa. No signup. No ads before you calculate. Real formulas — the same ones lenders, accountants, and pension administrators use.

Why this site exists

I kept doing the same calculations on a notepad — compound interest projections, retirement targets, take-home pay across the UK and South Africa — and couldn't find a single tool that handled all three regions without an account, a paywall, or a pre-calculation ad. So I built one.

FinCalcHub started as a weekend project in 2024. It's now thirteen calculators and thirty in-depth guides, covering compound interest, retirement, mortgages, tax, budgeting, debt, and net worth across three jurisdictions.

Who's behind it

The site is run by James Blanckenberg — me. I've spent the better part of two decades managing my own money across three countries: emigrating from South Africa, working in the UK, and dealing with the tax, pension, and investment rules of both regions plus the USA, where many of my friends and family ended up.

That cross-border experience is what most of the content draws on. I'm not a chartered financial planner, a tax agent, or a regulated adviser — and the site doesn't pretend to be. What it does is run the actual maths cleanly, explain the rules behind it, and point you at the primary sources (HMRC, SARS, the IRS, the Bank of England, the ONS) so you can verify the numbers yourself.

What I value, and what shapes the site

• Real numbers. Every calculator runs the actual formula, not a watered-down approximation. UK National Insurance bands, South African PAYE brackets and rebates, US FICA — all current to the most recent published rates.
• No signup walls. All calculations happen in your browser. Nothing leaves your device. You don't need to give us an email to use a tool.
• Genuine answers. The blog posts aim to explain what the maths actually shows, not pitch a product. If the honest answer is "it depends" or "this rule of thumb doesn't fit your situation", we say so.
• Three regions, deliberately. Most personal-finance content is US-only and pretends the rest of the world doesn't exist. We cover the USA, the UK, and South Africa side-by-side because that's the lived reality of a lot of readers.

How it's funded

FinCalcHub runs Google AdSense in spots that don't interrupt your calculation — banner slots above the fold and at the bottom of pages. Nothing else. We don't sell user data, we don't operate a paid product, and we don't take affiliate commissions for products we haven't personally used. The full disclosure is on the advertising & affiliate disclosure page.

How content is researched

The short version: primary sources first, working formulas always, dates on everything. Full detail is on the editorial policy page.

Spotted an error?

If you see a calculation that doesn't match your situation, a tax band that's out of date, or a typo — please tell me. The fastest way is email: jamesblanckenberg@gmail.com. I read every message and corrections usually go live within a day or two.

— James