The honest net-worth number when your money lives in four currencies
Converting balances is easy. Converting them correctly — with the right rate, at the right moment, rounded the way an accountant would — is where most apps quietly lie.
If your money lives in more than one currency, you have probably had this experience: three apps, three "total" figures, none of them agreeing, and no way to tell which one is closest to the truth. The gap is rarely fraud. It is almost always the rate, the timing, and the rounding — three small decisions that compound into a number you cannot trust.
Converting is easy. Converting correctly is not.
Multiplying a GBP balance by today's rate takes one line of code. The hard part is answering the questions underneath it.
- Which rate? Mid-market, the rate your card gave you, the rate your bank would give you on a wire — these diverge by more than a percent on a normal day.
- At which moment? A balance from this morning converted at tonight's rate is already a small fiction.
- Rounded how? Round each account, then sum? Or sum, then round? Across dozens of accounts the two answers drift apart.
Most personal-finance tools pick the convenient answer to each and never show their work. The result looks precise — it has cents — but it is not accurate.
What finura does instead
We treat the conversion as an auditable calculation, not a cosmetic one.
- Every balance carries the rate and timestamp used to convert it, and both are visible.
- We convert at a consistent reference time, so the total is internally coherent rather than a mix of moments.
- Rounding happens once, at the end, using banker's rounding — the same convention an accountant would use.
The goal is not a number with more decimals. It is a number you could defend to an auditor.
Why this matters for a personal app
You are not filing accounts. But the same discipline that keeps a company's books honest is what lets you answer "how am I actually doing?" without a mental asterisk. When the figure is built correctly, you stop second-guessing it — and that is the entire point of a net-worth view.
Precision is not decoration. It is the difference between a dashboard you glance at and one you actually believe.
David is the founder of finura, building a personal finance platform for people whose money crosses borders and currencies.