Monthly Net Worth Tracker
Month-over-month net worth change and implied annualised growth rate.
Track monthly net worth changes with this calculator. See absolute change, percentage shift, and implied annualised growth rate instantly.
What this tool does
Net worth at two points in time shows your financial trajectory. This calculator takes your net worth from the previous month and the current month, then returns three outputs: the absolute change in pounds, the percentage change from the prior month, and an annualised growth rate—calculated by compounding this month's percentage change across 12 months. The annualised figure illustrates what would happen if the current monthly pace continued unchanged, though in practice monthly net worth movements vary considerably. The result is most sensitive to the size of the gap between your two snapshots and your starting net worth level. This tool works for any time period you track; use it to observe patterns in savings, investment gains, or spending behaviour. Note: results are for illustration only and don't account for tax, inflation, or irregular income or expenses.
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Formula Used
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Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
Last month 100,000 net worth, this month 101,800 — a 1,800 monthly gain or 1.8% month-over-month. Annualised that's ~24% growth, though single-month rates rarely hold steady. Regular tracking reveals the trend: is wealth building, flat, or declining? Monthly visibility beats annual retrospectives.
What the result means
Primary is monthly change. Secondary rows show monthly percentage, annualised rate (if the monthly rate held), and the cumulative growth over 12 months if continued. Use it to spot trends — a single month is noise; a 6-12 month pattern is signal.
Why monthly matters
Annual reviews miss mid-year course corrections. Monthly tracking makes small wins and slowdowns visible while they're still fresh. The discipline of updating monthly also forces you to actually total assets and debts regularly — which is where most of the insight comes from, not the math.
Quick example
With last month's net worth of 100,000 and this month's net worth of 101,800, the result is 1,800.00. Change any figure and watch the output shift — it's often more useful to see the pattern than to memorise the formula.
Which inputs matter most
You enter Last Month's Net Worth and This Month's Net Worth.
What's happening under the hood
Monthly change is simple subtraction. Monthly percentage uses last month as base. Annualised rate assumes monthly percentage compounds for 12 months — unrealistic for any single month but useful as a directional reference. The formula is listed in full below. If the number looks off, you can retrace the calculation by hand — that's the point of showing the working.
Why seeing the lifetime figure changes behaviour
Humans discount the future — a cost 30 years away feels smaller than one today, even when the present-value math says otherwise. Tools like this one strip the discounting out and show the raw number. That emotional jolt is where behavioural change actually starts.
What this doesn't capture
This is an illustration, not a prediction. The specific figure depends entirely on your inputs — change any assumption and the headline moves. The value is in the pattern it reveals, not the exact pound figure.
Your net worth grew from £100,000 to £101,800, representing 1,800.00 in monthly change.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
The calculator computes net worth change by subtracting last month's net worth from this month's net worth. The monthly percentage change divides this difference by last month's net worth as the base. The annualised growth rate applies compound growth mathematics, assuming the observed monthly percentage change repeats uniformly across all 12 months of the year. This annualisation treats a single month's movement as though it were sustained throughout an entire year—a mathematical extrapolation rather than a prediction. The model does not account for fees, taxes, irregular income or expenses, investment volatility, or sequence-of-returns effects. It provides directional reference only and should not be interpreted as indicative of typical or expected annual outcomes.
References
Frequently Asked Questions
What should I include in net worth?
Include pension?
Is monthly too frequent?
What about market volatility?
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