Can a £1m win get a 40-year-old to age 90?
Modest spending, a £250k start-of-life upgrade and 3% net growth. Fifty years is a long runway.
- Big purchases
- £250k
- Monthly lifestyle
- £2.5k
- Yearly extras
- £5k
- Growth / inflation
- 3% / 2.5%
Lottery Win Lifespan Calculator
Estimate how long the remaining jackpot could support your chosen lifestyle, and whether it reaches the age you want it to.
Inflation context Bank of England target: 2%
Current CPI shown by the Bank: 2.9%
Current CPI shown by the Bank: 2.9%
Estimated lottery win lifespan —
Enter your figures to test the runway.
Money after big purchases —
First-year lifestyle cost —
First-year spending rate —
Money after 10 years —
Money after 30 years —
Same lifestyle cost in year 20 —
Run the calculator to compare your result with your chosen age target.
The model uses a constant monthly-equivalent growth assumption and increases spending gradually with your inflation assumption. Annual extras are spread across the year. Real markets do not produce smooth returns, so this does not model sequence-of-returns risk. Net growth should be entered after the effect of expected fees and tax.
Lottery win calculator challenges
Before you guess the answer, put these into the calculator
The scenarios are deliberately different. They show why the size of the jackpot by itself tells you surprisingly little about how long the money lasts.
Could a careful £5m win last longer than a luxury £10m win?
Keep the upfront upgrade under £1m and make the recurring lifestyle much less expensive.
- Big purchases
- £750k
- Monthly lifestyle
- £7k
- Yearly extras
- £20k
- Growth / inflation
- 4% / 2.5%
Surely £10m can support £25k a month for life?
Add a £2.5m property-and-family start, £100k of yearly extras and a permanent luxury lifestyle.
- Big purchases
- £2.5m
- Monthly lifestyle
- £25k
- Yearly extras
- £100k
- Growth / inflation
- 4.5% / 2.5%
What happens to £4m if the money earns nothing?
Keep the comfortable £4m lifestyle but remove investment growth completely and let inflation keep rising.
- Big purchases
- £900k
- Monthly lifestyle
- £12k
- Yearly extras
- £30k
- Growth / inflation
- 0% / 2.5%
Then change only one number. Try the £10m challenge again with £15,000 monthly spending. Try the £5m challenge with 0% growth. Try 4% inflation instead of 2.5%. The point is to see which assumption changes your runway most.
What determines how long lottery winnings last
What Affects How Long Your Lottery Winnings Will Last?
A bigger win obviously helps. But a larger house, recurring family support, inflation and an optimistic return assumption can overwhelm the advantage surprisingly quickly.
Upfront spend A £2m house removes £2m immediately. That capital can no longer support the future lifestyle.
Recurring spend £15,000 a month is £180,000 in year one before holidays and larger extras.
Inflation At 2.5%, a £120,000 annual lifestyle grows to roughly £192,000 after 20 years.
Net growth Returns can help, but the FCA warns that higher expected returns generally mean accepting more investment risk.
Inflation and lottery winnings
A lifestyle that costs £10,000 a month today will not stay at £10,000 forever
The Bank of England’s medium-term inflation target is 2%, while the rate shown by the Bank was 2.9% when this page was reviewed on 4 September 2026. The calculator therefore lets you test your own assumption rather than hard-coding one future inflation rate.
| Starting lifestyle | Inflation assumption | Approx annual cost after 10 years | Approx annual cost after 20 years | Approx annual cost after 30 years |
|---|---|---|---|---|
| £120,000 a year | 2% | £146,000 | £178,000 | £217,000 |
| £120,000 a year | 2.5% | £154,000 | £197,000 | £252,000 |
| £120,000 a year | 4% | £178,000 | £263,000 | £389,000 |
Inflation hurts recurring luxury more than one-off luxury. The price of the house is paid once. The cost of running the house, replacing cars, travelling, employing staff and supporting family repeats for decades.
Investment growth assumptions
Do not make the calculator work by typing in a return you hope to earn
The FCA says investment returns are uncertain and that seeking higher potential returns generally means taking more risk. That is why this calculator does not contain a “safe” investment-return preset.
Test 0% first
This shows what the spending plan looks like if the remaining capital does not grow. It is a useful baseline even if you intend to invest.
Use net growth, not a headline return
Investment fees, taxes and product costs can reduce what actually remains in the pot. Lower the growth assumption to reflect those costs rather than adding a pretend “free” return.
Real markets are uneven
A portfolio might gain strongly one year and fall the next. A smooth 4% calculator assumption is therefore a planning simplification, not the way real investments behave.
Sequence risk is not modelled. Large investment losses early in a period of heavy withdrawals can be more damaging than the same losses much later. Use this calculator to test spending pressure, not to replace a proper investment plan.
How many years should lottery winnings need to last?
Age matters because a lottery win can need to support several decades of life
The latest published ONS national life tables put UK period life expectancy at birth at 79.1 years for males and 83.0 years for females, and at age 65 the averages are a further 18.7 years for males and 21.2 years for females. Those are averages, not expiry dates.
Win at 30
Planning to age 90 means the money may need to support 60 years — much longer than most retirement-income periods.
Win at 50
A 40-year plan can still include children, property moves, parents, grandchildren, health costs and several economic cycles.
Win at 70
The personal horizon is shorter, but estate planning, gifting and family support can become a much larger part of the financial picture.
The target-age field is there to make the calculator answer a human question: “Does this version of my life get me where I need to go?” rather than merely returning a number of years.
Why large lottery wins can still run out
The dangerous spending is often the spending that becomes permanent
A Ferrari is visible. A permanently inflated annual lifestyle can be more expensive because it repeats and rises with inflation.
The expensive house keeps charging you
Insurance, heating, maintenance, grounds, security, staff and refurbishments continue long after the purchase completes.
Family support can become a second household budget
A one-off gift is easy to model. Paying several mortgages, school fees or monthly allowances indefinitely can quietly become part of your own permanent cost base.
Luxury resets what “normal” feels like
Better flights, more cars, larger holidays and greater convenience can each look small next to the jackpot while collectively creating a very large annual draw.
See Biggest Mistakes Lottery Winners Make for the wider behavioural and financial risks around a sudden fortune.
Lottery win lifespan questions
How long will lottery winnings last? FAQs
How long will my lottery win last?
It depends on the amount won, what you spend immediately, your recurring lifestyle, inflation, taxes, fees and the return earned on money that remains. The calculator turns those assumptions into an estimated runway and compares it with the age you want the money to reach.
Can £1 million lottery winnings last for life?
They can for some people but not everyone. If a large part goes on property and you stop working young, the remaining capital may need to support several decades of spending. Try the £1m challenge above rather than assuming the answer.
Can £5 million lottery winnings last for life?
A £5m win can have a very long runway when early purchases and recurring spending remain controlled. The challenge section deliberately shows how a careful £5m lifestyle can outlast a much more expensive £10m lifestyle.
Can £10 million lottery winnings run out?
Yes. A £10m prize is huge, but a multimillion-pound home, large family gifts, £25,000-plus monthly spending, annual extras and inflation can consume it much faster than the headline number suggests.
Why does the calculator ask my age?
Because “30 years” means something very different to a 30-year-old and a 70-year-old. The calculator compares the estimated runway with the age you want the money to reach.
Why does the calculator include inflation?
Inflation raises the future cost of maintaining the same lifestyle. The Bank of England targets 2% inflation over the medium term, but the actual rate moves above and below that level, so several assumptions should be tested.
What investment return should I enter?
There is no guaranteed number. Start with 0% to see the spending pressure without growth, then test several net return assumptions. Higher potential returns usually involve more risk, so do not make a spending plan work by typing in an optimistic return.
Does the calculator include tax and investment fees?
It does not calculate tax or fees separately. Instead, the growth field is labelled as net growth after fees and tax. If you expect those costs to reduce returns, use a lower growth assumption.
Why is first-year spending rate shown?
It shows how large the first year of spending is compared with the capital left after the big purchases. It is not labelled a safe withdrawal rate because there is no guaranteed percentage that works for every investment mix, time horizon and market sequence.
What does 100+ years mean?
It means the model still had money remaining at its 100-year limit. It is not a guarantee that the same investment returns, inflation or lifestyle would continue unchanged for a century.
Why can £5 million last longer than £10 million?
Because the jackpot size is only one variable. If the £5m winner keeps more capital invested and lives on much less each year, while the £10m winner spends several million at the start and creates a much more expensive permanent lifestyle, the smaller prize can have the longer runway.
Can lottery winners run out of money?
Yes. The usual pressure is not one purchase in isolation but the combination of large early spending, high recurring costs, family commitments, inflation, weak investment outcomes, taxes and fees.
Inflation, investment risk and longevity sources
Sources used for the calculator assumptions
The calculator itself is an illustration. The surrounding guidance was checked against current UK official and consumer-protection material on inflation, investment risk, taxation and life expectancy.