Purchasing Power Parity Calculator

Work out purchasing power parity instantly with clear inputs, formula shown and shareable results.

About Purchasing Power Parity Calculator

The PPP exchange rate is the rate at which an identical basket costs the same in both countries. Comparing it with the market rate measures how far a currency deviates from purchasing power parity — the logic behind the Big Mac index — and the average price per basket item is a useful check that the two baskets really are comparable.

Formulas

PPP rate

PPP rate = Basket cost in A / Basket cost in B

Misalignment

Deviation % = (PPP rate / Market rate - 1) x 100

Average item price

Average = Basket cost / Number of items in the basket

Worked example

With the default values below, Purchasing Power Parity Calculator returns PPP exchange rate of 72.414. Change any input above and every figure here is recalculated in your browser.

Inputs used

Cost of the basket in country A: 4,200
Cost of the same basket in country B: 58
Market exchange rate (A per unit of B): 83
Number of items in the basket: 25

Results

PPP exchange rate: 72.414
Deviation from PPP: -12.75%
Average price per basket item in country A: 168.000
Verdict: Currency A appears overvalued against B

Step by step

1Values used
2PPP rate
3Misalignment
4Average item price
5PPP exchange rate= 72.414
6Deviation from PPP= -12.75
7Average price per basket item in country A= 168.000
8Verdict= Currency A appears overvalued against B

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax or compounding frequency into account.
Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Indicative estimate only. Fees, entitlements, limits and formulas vary by jurisdiction, statute, policy wording and the facts of the case. This is not legal, tax, insurance or financial advice — confirm with a qualified professional or the relevant authority.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Indicative estimate only. Fees, entitlements, limits and formulas vary by jurisdiction, statute, policy wording and the facts of the case. This is not legal, tax, insurance or financial advice — confirm with a qualified professional or the relevant authority.

Frequently Asked Questions

Why do market rates deviate from PPP for so long?

Because capital flows, interest differentials and non-traded goods dominate short-run exchange rates. PPP is a long-run anchor, not a trading signal.

Does the basket composition matter?

Enormously. A basket weighted towards traded goods shows much smaller deviations than one weighted towards local services.