August 18, 2026·6 min read

Multi-currency net worth: how to get one honest number

When your money lives in more than one currency, your net worth moves on its own, and a single converted number hides whether you actually got richer. Here is how to track net worth across currencies honestly: each account in its own currency, one base, and the change inside your accounts kept separate from what exchange rates did.

If your money lives in more than one currency, your net worth has a problem most people never name: the total moves on its own. Convert everything into one currency by hand, and the number drifts up and down with exchange rates you never chose to bet on, while the thing you actually want to know, whether you got richer, hides underneath. Tracking net worth across currencies honestly comes down to three things: hold each account in its own currency, convert to one base at daily rates, and separate the change inside your accounts from the change your exchange rates cause. Get that right and the number finally means something.

Why a single-currency tracker misleads you

A spreadsheet or a typical app asks for one base currency, then leaves the converting to you. So you look up a rate, type in today’s value, and your net worth line moves. The problem is you cannot tell why it moved. Did you save, or did the kroner weaken against your euro holdings? The line answers a question about wealth and a question about currency at the same time, and blends them into one figure you cannot act on.

The usual workaround is worse: a separate tab per currency, updated on different days, at rates from whenever you last looked. You end up with three tidy sub-totals and no honest whole. For anyone cross-border, the whole is the entire point.

What “multi-currency” should actually mean

Three things, and most tools do none of them:

Hold each account in its native currency, not a converted guess. Your euro broker stays in euros; your Indian account stays in rupees.
Convert to a base you choose, at daily rates, and let you switch that base. What your net worth looks like in NOK and what it looks like in EUR are two useful views of the same money.
Separate the change inside your accounts from the change your exchange rates cause, so a good month and a weak kroner never look like the same thing.

Worked example. Lena and Rohan hold cash and investments in NOK in Oslo, a brokerage account in EUR, and an account in INR for family in India. Converted to kroner, their net worth is one number. But a 5% move in EUR against the kroner shifts the euro sleeve by tens of thousands of kroner on that total, with no change at all in what they own. A plain NOK spreadsheet shows the swing and hides the cause. A multi-currency view shows the same total and labels it: this much came from your accounts, this much from the exchange rate.

The number is the start, not the finish

Here is the part most trackers miss. Even an honest, multi-currency total does not tell you what to do. Two households with the identical number can be in completely different shape: one with a thin safety net and a fat locked pension, another with years of runway but nothing compounding. The headline figure treats those as the same. They are not.

So the number is the floor, not the ceiling. The next question is what job each part of your money is doing. fjordFIRE sorts every account into one of four pillars: Protect (your safety net, in months of runway), Growth (what is compounding toward financial independence), Retire (pensions you cannot touch until an access age), and Move (how far your liquid money carries you in another country). The full frame, with a worked example, is in the four-pillar post.

How fjordFIRE does it

You add each account in its own currency, by hand. There are no bank logins, so nothing reads your transactions and nothing is sold on. fjordFIRE converts everything to your chosen base at daily rates and shows one net worth number you can trust. The Net Worth Trends view then splits each period’s change into two labelled parts: organic change (what happened inside your accounts, in their own currencies) and FX impact (what converting to your base added or took away), with a per-currency breakdown underneath, so a strong quarter and a weak kroner never get confused.

Each account is also tagged to its pillar, so the number is not just a number. In a household, each person gets their own version, because two people rarely hold the same currencies or the same goals. If you want to go deeper on the currency side, the FX attribution post applies the same idea to your savings rate.

See it on your own money

There is no substitute for your real accounts in one honest view. Add them in the currencies you actually hold, pick a base, and watch the total separate the change inside your accounts from what the exchange rate did. The Emergency Fund calculator sizes your Protect pillar in multiple currencies if you want to start there.

fjordFIRE is open to everyone, free. Manual entry, no bank logins, no data sold.

Companion tools: Emergency Fund calculator · Currency Conversion Cost calculator.