Quick answer
The PPP exchange rate = price of a basket in currency A ÷ price in currency B. A basket costing 4.5 in A and 3.0 in B gives a PPP rate of 1.5, so 100 in A is worth 66.67 in B.
Enter the basket prices in two currencies and an amount in currency A. The calculator returns the PPP rate and the equivalent amount in B. Use this purchasing power parity (ppp) calculator to check your own figures.
Related tools: Price Elasticity of Demand Calculator: Price elasticity of demand by the midpoint (arc) method. GDP Calculator: Gross domestic product by the expenditure approach. Marginal Cost Calculator: Extra cost of producing additional units.
How to use the Purchasing Power Parity (PPP) Calculator
- Enter basket price in currency A (above 0).
- Enter basket price in currency B (above 0).
- Optionally, enter amount in currency A (above 0).
- Press Calculate to see the result, and use Reset to start again.
| Input | What to enter | Allowed values |
|---|---|---|
| Basket price in currency A | A number | > 0 |
| Basket price in currency B | A number | > 0 |
| Amount in currency A (optional) | A number | > 0 |
Formula and method
Formula
PPP rate = price in A ÷ price in B; equivalent in B = amount ÷ PPP rate
IEEE-754 double precision; shown to at most 6 decimal places.
Absolute PPP using one basket; it is a comparison tool, not a market exchange rate.
Worked examples
These examples are verified: each one is an automated test case that the live calculator must reproduce exactly.
Example 1
Inputs: Basket price in currency A = 4.5; Basket price in currency B = 3.0; Amount in currency A = 100.
| Result | Value |
|---|---|
| PPP exchange rate (A per B) | 1.5 |
| Equivalent amount in currency B | 66.6667 |
Example 2
Inputs: Basket price in currency A = 250; Basket price in currency B = 12000; Amount in currency A = 1000.
| Result | Value |
|---|---|
| PPP exchange rate (A per B) | 0.0208 |
| Equivalent amount in currency B | 48,000 |
Example 3
Inputs: Basket price in currency A = 7; Basket price in currency B = 7; Amount in currency A = 50.
| Result | Value |
|---|---|
| PPP exchange rate (A per B) | 1 |
| Equivalent amount in currency B | 50 |
The first line is the headline result (pPP exchange rate (A per B)). Below it the purchasing Power Parity (PPP) Calculator lists equivalent amount in currency B, which describe the same case from other angles. IEEE-754 double precision; shown to at most 6 decimal places.
What PPP says
Purchasing power parity says that, in the long run, exchange rates should equalise the price of the same basket. If the market rate differs, a currency may be over- or under-valued relative to PPP. The Economist's Big Mac index is a well-known example.
The basket matters
The result depends on the chosen basket: a basket of traded goods behaves differently from services. Real exchange rates also depend on trade barriers, taxes and capital flows.
How the result changes with basket price in currency A
Holding every other input at the first worked example, this table changes only basket price in currency A. It shows how sensitive the answer is to that one value; each row was produced by running this calculator.
| Basket price in currency A | PPP exchange rate (A per B) | Equivalent amount in currency B |
|---|---|---|
| 2.25 | 0.75 | 133.3333 |
| 4.5 | 1.5 | 66.6667 |
| 9 | 3 | 33.3333 |
| 18 | 6 | 16.6667 |
What happens with invalid input
These messages are produced by the calculator itself, so you know what to fix.
- Basket price in currency A: entering "0" shows "Basket price in currency A must be greater than 0." beside that field and no result.
- Basket price in currency B: entering "0" shows "Basket price in currency B must be greater than 0." beside that field and no result.
Choosing between the Purchasing Power Parity (PPP) Calculator and similar calculators
Each row shows what a related calculator on this site asks for and what it returns, so you can pick the one that matches your question.
| Calculator | You enter | It returns |
|---|---|---|
| [Price Elasticity of Demand Calculator](/business/price-elasticity-demand/) | price before, price after and quantity before | Price Elasticity of Demand |
| [GDP Calculator](/business/gdp-calculator/) | consumption, investment and government spending | GDP |
| [Marginal Cost Calculator](/business/marginal-cost/) | total cost before, total cost after and quantity before | Marginal cost |
| [Marginal Revenue Calculator](/business/marginal-revenue/) | total revenue before, total revenue after and quantity before | Marginal revenue |
| [Opportunity Cost Calculator](/business/opportunity-cost/) | return of the option you gave up and return of the option you chose | Opportunity cost |
Background: personal finance estimates
Financial calculators project from the numbers you give them. Long-range tools depend on guesses about returns and tax rates that are unlikely to hold exactly, payoff tools assume a fixed payment and rate, and tax or salary results depend on the tax year, filing status and country. Official calculators say their output is for reference only.
For decisions that matter, use conservative inputs and check the figures against your lender, plan documents or a qualified adviser.
Assumptions and limitations
- Depends on the chosen basket
Results are estimates for planning, not financial advice. Lender terms, fees, taxes and rounding rules can change real figures, so confirm important numbers with your lender or a licensed adviser.
If a required value is empty, not a number, or outside its allowed range, the form marks that field with a message and shows no result instead of a misleading number. The automated checks deliberately try invalid entries for basket price in currency A and basket price in currency B to confirm this.
Frequently asked questions
Is PPP the same as the exchange rate?
No, the market rate often differs.
What is the Big Mac index?
A light-hearted PPP measure using burger prices.
Why use PPP for GDP?
It compares real living standards.
What does the Purchasing Power Parity (PPP) Calculator calculate?
PPP exchange rate from the price of the same basket in two currencies. It returns PPP exchange rate (A per B) and Equivalent amount in currency B.
What formula does the Purchasing Power Parity (PPP) Calculator use?
PPP rate = price in A ÷ price in B; equivalent in B = amount ÷ PPP rate. Absolute PPP using one basket; it is a comparison tool, not a market exchange rate.
What do I need to enter in the purchasing Power Parity (PPP) Calculator?
You enter Basket price in currency A and Basket price in currency B. Optional: Amount in currency A.
How is the result rounded or limited?
IEEE-754 double precision; shown to at most 6 decimal places. Depends on the chosen basket.
What is an example of a purchasing Power Parity (PPP) result?
With basket price in currency A 4.5, basket price in currency B 3.0 and amount in currency A 100, the pPP exchange rate (A per B) is 1.5.
Where does the method come from?
The method follows: Absolute purchasing power parity (e.g. OECD PPP methodology).
Can I rely on this calculator for a decision?
Results are estimates for planning, not financial advice. Lender terms, fees, taxes and rounding rules can change real figures, so confirm important numbers with your lender or a licensed adviser. For this calculator in particular: Depends on the chosen basket.
Related calculators
- Price Elasticity of Demand Calculator — Price elasticity of demand by the midpoint (arc) method.
- GDP Calculator — Gross domestic product by the expenditure approach.
- Marginal Cost Calculator — Extra cost of producing additional units.
- Marginal Revenue Calculator — Extra revenue from selling additional units.
- Opportunity Cost Calculator — Value given up by choosing one option over another.
- Income Elasticity of Demand Calculator — Income elasticity of demand by the midpoint (arc) method.
Sources
- Absolute purchasing power parity (e.g. OECD PPP methodology)
Content last reviewed 2026-11-04. Formulas and worked examples are checked by automated tests against independently computed values.