2024 CPI · HYSA 4.5% · S&P 500 10% avg · historical presets

inflation calculatorpurchasing power calculatorinflation impact moneyreal vs nominal valueinflation vs investingCPI calculator 2024

//// Financial · Inflation

What Inflation Is Doing to Your Money

Your $50k salary feels like $36k in 10 years if it doesn't grow. See purchasing power erosion, compare inflation vs HYSA vs S&P 500, and understand why idle cash loses value.

Where this fits

💸 Budgeting & Cash Flow Cash Flow Employees Households

This tool lives inside Cash Flow and is most useful for employees and households.

401(k) Limit 2024$23,000(+$7,500 catch-up 50+)

Roth IRA Limit$7,000(MAGI phase-out applies)

S&P 500 Avg Return~10%/yr(nominal, historical)

Inputs

Amount ($)

Annual inflation rate

Years to project: 10

140

Historical presets

Purchasing power in 10 years

Your $50,000 will feel like $35,379

at 3.4% annual inflation over 10 years

Purchasing Power Loss

$14,621

% Lost

29.2%

HYSA (4.5%)

$77,648

S&P 500 (10%)

$129,687

Year-by-year comparison

Year	Checking (0%)	Under Inflation	HYSA (4.5%)	S&P 500 (10%)
Year 0	$50,000	$50,000	$50,000	$50,000
Year 5	$50,000	$42,059	$62,309	$80,526
Year 10	$50,000	$35,379	$77,648	$129,687

Student tip

Your $1,000 in a checking account is losing approximately $34/year in purchasing power to inflation at 3.4%. A HYSA earning 4.5% would turn that $1,000 into $1,553 in 10 years.

Verdict

A HYSA at 4.5% beats 3.4% inflation by 1.1 percentage points — your real purchasing power grows.

Purchasing power after inflation

FV = PV × (1 − inflationRate)^years

FV = $50,000 × (1 − 3.4%)^10

= $35,379

Each year your dollar buys less — this compounds just like interest, but in reverse.

Total purchasing power loss

Loss = PV − FV

Loss = $50,000 − $35,379

= $14,621 (29.2% lost)

HYSA value (4.5% APY)

HYSA_FV = PV × (1 + 0.045)^years

HYSA_FV = $50,000 × (1.5530)

= $77,648

HYSA compounds annually — your balance grows while inflation erodes uninvested cash.

Current HYSA benchmark: 4.5% APY (2024)

S&P 500 value (10% avg annual return)

SP500_FV = PV × (1 + 0.10)^years

SP500_FV = $50,000 × (2.5937)

= $129,687

Historical S&P 500 average: ~10% nominal per year. Not guaranteed — actual returns vary.

S&P 500 historical avg: ~10%/yr nominal (1957–2024)

Real HYSA gain (nominal growth above starting amount)

realGain = HYSA_FV − PV

realGain = $77,648 − $50,000

= $27,648

Even after inflation, HYSA beats idle checking by this amount over the period.

Key insight

At 3.4% inflation, the rule of 72 says purchasing power halves in ~21 years. HYSA at 4.5% grows your money nominally — but inflation eats 3.4% of that gain each year.

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