Future Expense Calculator

What a recurring monthly expense will cost in the future after inflation.

Budgets that assume today’s prices will still hold in five or ten years get quietly broken by inflation. This calculator shows what a current monthly expense becomes in the future.

At a glance

What you enter: Current monthly expense, Years into the future, Assumed annual inflation rate
What you get: Estimated future monthly cost, Estimated future annual cost
Formula shown: Yes — every step, right below your results.
Cost and privacy: Free, no account needed, and nothing you type is stored.

See worked examples ↓ Read the FAQ ↓ Share this calculator ↓

Results are estimates for general information only — always verify with a professional or official source before acting on them.

How to use the Future Expense Calculator

1 Enter Current monthly expense
2 Enter Years into the future
3 Enter Assumed annual inflation rate
4 Press Calculate. You get Estimated future monthly cost, Estimated future annual cost, and every intermediate step stays visible under “How is this calculated?”
5 Change one number at a time to see what moves the result — that is usually the most useful thing a calculator can tell you.

Worked examples

Real numbers run through this calculator. Open any example to load it into the form above and change it.

$800 a month for 10 years at 3%

A mid-range recurring expense over a decade, at a modest assumed rate.

You enter

Current monthly expense: $800.00
Years into the future: 10
Assumed annual inflation rate: 3%

You get

Estimated future monthly cost: $1,075.13
Estimated future annual cost: $12,901.60

At 3% for ten years, $800 a month becomes about $1,075 — roughly $12,902 a year, and $275 more per month than the same expense costs today.

Open this example in the calculator →

$1,200 a month for 25 years at 5%

A longer horizon and a higher assumed rate.

You enter

Current monthly expense: $1,200.00
Years into the future: 25
Assumed annual inflation rate: 5%

You get

Estimated future monthly cost: $4,063.63
Estimated future annual cost: $48,763.51

A longer horizon at a higher rate changes the order of magnitude: $1,200 a month reaches about $4,064, which is $2,864 more — well over double today's cost — and close to $48,764 a year.

Open this example in the calculator →

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Frequently asked questions

Which of my expenses belong in this calculator?

Use a recurring monthly expense you expect to keep paying: insurance premiums, childcare, a phone or internet contract, commuting costs, subscriptions. If you want a total for several expenses, add up what they cost today and enter that sum as one figure — the calculator compounds a single monthly amount. Leave out one-off purchases and anything you plan to cancel.

Why is the future cost higher than inflation × years?

Because inflation compounds: each year's rise is calculated on the previous year's price, not on today's. At 3% a year the total rise over 15 years is about 56%, not the 45% that multiplying 3% by 15 suggests. The longer the horizon, the wider that gap becomes.

What if this expense rises faster than general inflation?

Then enter a higher rate for it. Some categories — health insurance, childcare, tuition — have historically moved differently from the overall average, so a general rate can understate them. The honest caveat is that this tool applies one constant rate every year; real inflation varies, so treat the result as a scenario rather than a prediction.

Does this tell me how much to save to cover the expense?

No — it projects the cost, not the funding plan. Take the future monthly figure into the Savings Goal Calculator to see what to set aside, and check that contribution against your monthly budget. Keeping the projection and the saving plan separate stops you confusing a higher price with a higher contribution.