Return type
The expected annual return is treated as a nominal investment return before platform or fund fees. The calculator converts it to the selected compounding period.
Investment Goal Calculator
Last reviewed: 30 June 2026
Methodology: Starlight Tools calculator model
Editorial note: Educational estimates, not regulated advice
Your Answer
Required contribution
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Monthly estimate
Target date / time
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Projected final balance
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Nominal pounds
Total contributions
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Regular plus one-off
Estimated growth
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After fee drag
Inflation-adjusted target
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In today's money
Investment Calculator Inputs
Choose what to solve
Goal presets
Goal values
Solver details
Contribution and compounding
Applied at the start of the projection.
Raises regular contributions once per year.
Return assumptions
Uncertainty uses a simple Monte Carlo model (lognormal monthly returns). Quick ≈ 400 paths; Detailed ≈ 1200 paths.
This educational calculator excludes tax, account wrapper rules, trading costs, and personalised suitability. Use conservative assumptions for money you need on a fixed date.
Projection Details
Progress so far:
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Success probability by target date:
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(Monte Carlo estimate; target-date modes only)
Goal in today's money (estimate):
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(discounted by inflation to the expected date)
Educational estimates, not financial advice. Taxes, trading costs, and behavioural factors aren’t included. Markets go up and down.
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Accumulation Schedule
Yearly view shown by default. Use the button for a monthly view.
| Month / year | Contribution | Estimated growth | Fees | Ending balance | Today's-money value |
|---|---|---|---|---|---|
| Enter values to build a schedule. | |||||
Assumptions and Methodology
Fee treatment
Annual fees are converted to the same compounding period and deducted from return before growth is applied. The schedule shows the estimated fee drag separately.
Contribution timing
Beginning-of-period contributions are invested before that period's growth. End-of-period contributions are added after the period's growth.
Inflation adjustment
Today's-money values divide future balances and targets by inflation over the projection horizon. This is a purchasing-power estimate, not a tax calculation.
Monte Carlo limits
Uncertainty uses a simple monthly lognormal return model from your expected return and volatility. It does not predict crashes, regime changes, taxes, or behavioural choices.
Excluded items
Taxes, wrapper rules, contribution limits, trading costs, withdrawal penalties, and personal suitability are excluded. Treat the output as planning information, not advice.
Choosing Expected Return and Volatility
Conservative
Return: 2-4% before fees. Volatility: 3-8%. Useful for shorter or more essential goals where a large market fall would be difficult to recover from.
Balanced
Return: 4-7% before fees. Volatility: 8-15%. A middle-ground assumption for diversified portfolios with a mix of growth and defensive assets.
Growth
Return: 6-9%+ before fees. Volatility: 15-25%+. Best reserved for long, flexible goals where you can tolerate deep drawdowns and delayed target dates.
Lower assumptions are usually more useful for fixed-date goals. Higher expected returns can make a plan look affordable while also increasing the chance of missing the date.
Investment Goals: How to Plan, Fund, and Stay on Track
Investment goals are targets you pursue with assets that can fluctuate in value—shares, bonds, funds, or diversified portfolios. Unlike a short-term savings pot, an investment goal accepts volatility in exchange for a chance at higher long-run, inflation-beating returns. That trade-off changes how you plan: you’ll think in probabilities, make peace with ups and downs, and focus on process over prediction.
1) Define the goal in investing terms
- Amount & date: Express your target in nominal pounds and also in today’s money to keep expectations realistic (
real ≈ (1+nominal)/(1+inflation) − 1over time). - Essential vs optional: If the goal is “must have” on a fixed date (e.g., tuition), plan more conservatively than for a flexible goal (e.g., retire a year later if markets are poor).
- Funding path: Decide whether you want to solve for monthly contribution, time to goal, final amount, starting balance, or required return.
2) Choose an asset mix that matches horizon and risk
Broadly, longer horizons can tolerate more equity risk because there’s time to recover; shorter horizons lean toward bonds and cash-like assets. Your “sleep at night” level matters as much as maths: an allocation you can stick with beats a perfect plan you abandon during volatility.
3) Model returns realistically
- Expected return, volatility, and fees: Plan with a sensible long-term return, include annual fees, and recognise volatility. Small fee differences compound meaningfully over decades.
- Distribution of outcomes: Our uncertainty toggle runs a simple Monte Carlo to display percentile bands (e.g., P10/P50/P90) and a success probability for date-based goals. This reframes the goal as a range of possible paths, not a single line.
- Inflation lens: Track both nominal and “today’s money” values to avoid overestimating progress.
4) Build a robust contribution plan
- Automate monthly investing: Regular, automatic contributions (pound-cost averaging) reduce timing anxiety and keep you moving through market noise.
- Escalators: Consider a yearly increase (e.g., +5–10%) to contributions when income rises—small nudges add up.
- Rebalancing: Periodically restore your target mix (or use bands) so risk doesn’t drift after market swings.
5) Manage sequence risk near the finish line
Big market drops just before your target date can derail an otherwise solid plan. If the goal has a firm date and must be met, consider gradually de-risking (“glide path”) as you approach the end—trading some upside for more certainty.
6) Account wrappers, taxes, and costs
Platform fees, fund charges, and taxes can change net returns. Use low-cost, diversified funds where appropriate and consider tax-efficient wrappers available to you (e.g., ISAs, pensions). The exact rules depend on your jurisdiction and can change, so check current guidance.
7) Review, don’t react
Markets will surprise you. Set a review cadence (e.g., quarterly), adjust contributions if your life changes, and use the probability/bands as signposts—not as triggers to abandon the plan after a bad month.
Educational note: This tool provides general information only and does not constitute financial advice. Investments can go down as well as up, and you may get back less than you invest. Consider your risk tolerance, costs, tax circumstances, and seek regulated advice if needed.
Investment Goal Calculator Guide
How much should I invest each month?
Start with the target, date, current balance, expected return, and fees. The monthly contribution answer is the recurring amount that closes the gap under those assumptions.
Monthly contribution
Investment goal vs savings goal
A savings goal is usually for stable cash or near-cash returns. An investment goal accepts market volatility for a chance of higher long-term growth.
Risk trade-off
How inflation changes your target
A future balance can look large while buying less than expected. The today's-money value discounts the future target so you can judge purchasing power.
Inflation
Why fees matter
Fees reduce the return that compounds for you. A small annual percentage can make a noticeable difference over long horizons, especially for retirement and FIRE goals.
Fee drag
What success probability means
With uncertainty enabled, success probability is the share of simulated paths that finish at or above the target by the date. It is a model output, not a guarantee.
Monte Carlo
Investment Goal Calculator FAQ
How is monthly contribution calculated?
The calculator projects the starting balance and recurring contributions through the target date, then searches for the contribution amount that makes the final balance match the target.
What formula is used?
For fixed contributions, it uses compound growth plus the future value of an annuity. When annual contribution increases or non-monthly frequencies are used, it projects period by period.
Are fees included?
Yes. Annual fees reduce the return applied each compounding period, and the schedule estimates the fee drag for each row.
Are taxes included?
No. Tax rates, account wrappers, and contribution limits vary by person and jurisdiction, so they are excluded from the model.
How does inflation work?
Inflation does not change the nominal target you type in. It discounts future values to show an estimated value in today's money.
Can I change compounding frequency?
Yes. Choose monthly, daily, quarterly, or annual compounding. Contribution timing can also be set to beginning or end of period.
How should I choose volatility?
Use lower volatility for conservative portfolios and higher volatility for equity-heavy growth portfolios. It only affects Monte Carlo uncertainty bands.
What if the required monthly contribution is too high?
Try a later target date, lower target, larger starting balance, one-off extra contribution, annual contribution increase, or lower fees. Avoid relying on unrealistic return assumptions.