Instant, accurate calculations for USA, UK, and South Africa.
No signup. No ads before you calculate. Just answers.
All calculators support USA, UK, and South Africa — switch region with one click.
Every calculator on this site runs the exact formula a payroll system, lender, or pension administrator would use against the current published bands and rates. We do not approximate, we do not use marketing-friendly rounded numbers, and we do not paywall any of the maths. If a HMRC, SARS, or IRS publication is the underlying source for a rate, the calculator page links to it so you can verify the figure yourself.
Calculations happen entirely in your browser. The income, balance, contribution, or rate you type into a field never leaves your device — there is no submit button, no account, and no analytics on the values themselves. Aggregate site analytics (pageviews) run via Google Analytics and Plausible; calculator outputs do not.
The three-region toggle on every calculator switches the underlying tax tables, contribution caps, and currency labels in one click. A retirement projection that uses US 401(k) limits and federal marginal tax becomes a UK SIPP projection at HMRC bands with the same inputs, or a SA Retirement Annuity projection at SARS brackets. The calculator does not pretend the regimes are equivalent — it shows you how the same savings rate produces a meaningfully different outcome depending on tax wrapper.
Most personal-finance sites are written from one country's perspective. That is fine if you are an American reader who only ever has American problems, but the moment you have UK pension contributions, a mortgage in South Africa, or a child planning a US college path, single-country advice stops being useful. FinCalcHub exists because the three jurisdictions our author has personally worked across — the USA, the UK, and South Africa — each handle saving, investing, taxing, and lending in genuinely different ways that one-size answers misrepresent.
As one practical example: a $10,000 contribution to a US 401(k), a £10,000 contribution to a UK SIPP, and a R200,000 contribution to a SA Retirement Annuity all reduce the saver's taxable income by the same gesture, but the marginal-rate tax saving, the contribution caps, the withdrawal rules, and the inheritance-tax treatment are different in each country. A calculator that quietly applies US assumptions to a UK saver will produce a number that looks plausible but is wrong.
Where the rules genuinely converge — compound interest mathematics, mortgage amortisation, the geometry of saving early versus late — the calculators here produce identical answers across regions because the underlying maths is universal. Where the rules diverge — payroll deductions, retirement wrappers, inheritance, dividend tax — the region toggle does meaningful work.
If you have never run a compound-interest calculation against your own savings rate, start there — it is the single most consequential exercise in personal finance and the number it produces tends to change the saver's behaviour more than any article about saving does. If you are within ten years of stopping work, run the retirement savings calculator against your current balance and contribution rate to see whether the trajectory works. If you have debt, the debt snowball calculator compares snowball versus avalanche head-to-head on your actual numbers.
Below are the categories grouped by what you are trying to figure out. The full directory at personal finance calculators lists every tool with a one-line description.