Live basket-left shrink meter and wage-raise gap - so face-value dollars never pretend to be constant purchasing power.
Educational constant-rate sketch. Nominal ≠ real. Not a CPI forecast, COLA contract, or investment advice.
By Ahmet C. Toplutaş·Site owner & editor · Finance tools
Last updated May 21, 2026 · Reviewed May 21, 2026 · Planning estimates only - not tax, medical, or investment advice
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A paycheck, rent check, or savings balance is a nominal number - digits on a statement. Real purchasing power is what those digits still buy after prices drift. When inflation runs and the face amount stands still, the lifestyle capacity quietly shrinks.
This page’s framing is Nominal ≠ real. The panel compounds a constant annual inflation assumption, then shows how much of today’s basket remains, how many nominal dollars you would need later to defend that basket, and whether a headline raise actually beats inflation.
That is different from compound interest (growing a balance when you earn a return) and different from retirement withdrawal rules. Here the literacy skill is reading face value against purchasing power - not picking a fund.
Official CPI baskets differ by country and month. Use bureau data to choose a planning rate; this tool’s job is to make that rate’s damage (or defense target) impossible to ignore on a cash pile or wage path.
Decision framing: “How much basket is left?” - not “Is the account balance still the same number?”
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Erode holds today’s nominal amount fixed and asks what it is worth in today’s purchasing-power units after N years: amount / (1+r)ⁿ. Defend asks the inverse - how many nominal dollars you need later to buy the same basket: amount × (1+r)ⁿ.
Both use a constant annual rate. Reality zigzags; planning often still needs a single assumption so you can stress a paycheck, rent budget, or cash emergency fund. Swap the rate, not the formula, when you want a hotter or cooler scenario.
Cumulative inflation is the percent the price level rose under that path - (1+r)ⁿ − 1. It is not the same number as “basket left,” which is the reciprocal share of purchasing power remaining.
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The unique affordance is the shrink meter: a bar for how much of today’s consumption basket a fixed nominal pile still covers after your horizon. Beside it, nominal↔real twin cards keep face value and purchasing power from collapsing into one number.
That meter is not a pregnancy term rail, not a DTI stretch ladder, and not a calorie pace dial. It is purchasing-power literacy for a single cash or wage reference amount - one visual for Nominal ≠ real.
When the green/amber slice thins under ~70%, lifestyle fit is already under pressure even if the bank app still shows the old balance. Defend mode then prints the larger nominal target that would restore today’s basket.
Try the Hot stretch preset: 6% for five years - watch basket left fall fast without any “loss” on the statement.
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A 4% raise during 5% inflation can feel like progress on the offer letter and still be a real cut. The panel’s raise gap uses the compound identity: real raise ≈ (1 + raise) / (1 + inflation) − 1, and also shows the simple percentage-point gap for intuition.
Set raise to 0 when you are modeling idle cash or a frozen stipend. Set it to your expected COLA or promotion path when the question is “does my paycheck keep up?” Salary tax withholding still sits outside this sketch - pair with the salary calculator for take-home stories.
Raises are not guaranteed every year at a constant rate any more than inflation is. Treat both fields as scenario knobs. If the real raise stays negative across mild and hot inflation presets, the compensation story is the problem - not the calculator.
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Horizon chips hold amount and inflation fixed while swapping common spans (5, 10, 20, 30 years). Each chip prints basket-left percent and the defend target (need later). Long horizons make mild rates look less mild - the quiet math behind retirement and tuition sticker shock.
Custom year counts still compute; chips are anchors so you can jump without retyping. For growth of invested balances, hand off to the compound interest calculator and compare nominal yield to this page’s inflation assumption for a rough real return.
Display currency uses a dollar format for site consistency. Enter amounts in whatever unit you plan in; ratios and basket-left percent carry the Nominal ≠ real lesson.
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Example A · Mild decade. Preset: $50k at 2.5% for 10 years with a 3% raise. Note basket left under erode, then flip to defend for the need-later number.
Example B · Hot stretch. Preset: 6% for five years. Shrink meter tightens quickly - useful for stress-testing emergency cash that earns less than inflation.
Example C · Defend nest egg. Preset forces defend story on a larger pile over 20 years - the nominal target that keeps today’s basket.
Example D · Raise trap. Preset: 4% raise against 5% inflation. Real raise goes negative even though the offer letter shows a raise - Nominal ≠ real in wage clothing.
After presets, paste your own cash reference or salary and the inflation rate you believe for planning. Share only when story + inputs match the scenario you intend to send.
If two people argue about “whether inflation matters,” put the same amount on Mild decade and Hot stretch. Disagreement about the rate is fine; disagreement about whether face value equals lifestyle is not.
For multi-decade retirement spending in today’s dollars, also use the retirement calculator - this page stays the inflation literacy layer.
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Most inflation surprises are face-value worship and rate denial - not broken exponents.
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Share links snapshot amount, rate, years, raise, and story. Live typing never rewrites the address bar.
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Stop here for Nominal ≠ real literacy: basket shrink, defend targets, and wage-raise gaps. Hand off for compounding growth, retirement paths, or paycheck withholding.
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Nominal dollars are the face amount on a paycheck, price tag, or savings balance. Real purchasing power is what that face amount still buys after inflation. This page’s framing is Nominal ≠ real so a constant $50,000 salary or cash pile is not mistaken for constant lifestyle capacity.
It shows what share of today’s consumption basket a fixed nominal amount can still afford after N years at your assumed inflation rate. That shrink meter is the unique affordance - different from due-date term rails, house-affordability DTI ladders, or EMI flat/reducing mirrors.
Enter a nominal annual raise beside inflation. Real raise ≈ (1 + raise) / (1 + inflation) − 1. If inflation outruns the raise, purchasing power falls even when the paycheck number goes up - another Nominal ≠ real trap.
Erode asks how much buying power a fixed nominal pile keeps. Defend asks how many nominal dollars you need later to match today’s purchasing power. Same inflation math; two decision questions.
No. You enter a constant annual inflation assumption for planning. Official CPI series vary by country, basket, and month. Use bureau data to pick a rate; this tool compounds that assumption.
Compound interest grows a balance when you earn a return. Inflation shrinks what each dollar buys. Pair them to think in real returns: nominal yield minus inflation (approximately), or (1+yield)/(1+inf)−1 more precisely.
No. Values hydrate from the URL on load; the address bar updates only when you use Share or Copy.
LIVE INFLATION · NOMINAL ≠ REAL
Nominal ≠ real ↓Scenario presets
Real purchasing power left
$39,060
Basket left 78.1% · cumulative inflation 28.0% over 10y
BASKET-LEFT SHRINK · TODAY’S NOMINAL PILE
78.1% of today’s basket still affordable
21.9% eroded
Green/amber = real capacity left if the face amount never changes. Grey = inflation’s take under your constant-rate assumption.
NOMINAL
Face-value dollars
$50,000
Unchanged number on the statement
REAL
Purchasing power
$39,060
What $50,000 still buys after 10y
WAGE-RAISE GAP · NOMINAL RAISE VS INFLATION
+0.5%real raise / yr
Nominal raise +3.0% minus inflation +2.5% ≈ gap +0.5% (simple). Compound real raise uses (1+raise)/(1+inf)−1.
Raise outruns inflation on this sketch - real purchasing power can still grow.
Horizon chips · basket left at your rate
Nominal ≠ real
The statement balance can stay flat while the basket shrinks. A raise can look generous in percent terms and still lose to inflation on real purchasing power.
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