Inflation Calculator for United Kingdom
United Kingdom · GBP. Compare future costs with purchasing power today.
Smarter
Decisions.
Bigger Dreams.
Calculator Parameters
All amounts in GBP.
£10,000.00 Minimum £0.00; maximum £10,000,000.00.
3% Minimum 0%; maximum 30%.
20 Minimum 1; maximum 50.
Your estimate
Future cost of the same purchase
£18,061.11
Purchasing power of today’s amount in future
£5,536.76
Cumulative price increase
80.61%
Based on the assumptions shown. This result is an illustration, not a quotation or guaranteed benefit.
Growth Projection
Method and scope
Future cost = current cost × (1 + annual inflation)^years. Purchasing power = current amount / (1 + annual inflation)^years. Inflation is a user assumption held constant; no live national inflation rate is fetched.
Using this calculator in United Kingdom
The inflation rate is entered by you and stays constant. No current United Kingdom CPI series is loaded. Both results use GBP: future cost describes a future price, while purchasing power describes what today's amount could buy after the entered period.
Try the starting example
Amount today: £10,000; Assumed annual inflation: 3%; Years: 20.
Future cost of the same purchase: £18,061.11.
Compare one assumption at a time
Compare future cost and remaining purchasing power together. A higher inflation assumption raises the future cost of the same basket and reduces the purchasing power of a fixed amount. This is a scenario comparison, not a current national CPI reading. These fictional scenarios use the starting inputs printed above, not your current entries in the interactive calculator.
| Assumed annual inflation | Future cost of the same purchase | Interpretation |
|---|---|---|
| 1% | £12,201.90 | One changed input |
| 3% | £18,061.11 | Starting example |
| 5% | £26,532.98 | One changed input |
Are you comparing money available now with money set aside for retirement?
A cash savings goal and a SIPP balance answer different questions. The SIPP model includes basic-rate relief under its stated assumptions, while the savings tool excludes tax and account restrictions. Keep accessible savings separate from a retirement balance when comparing the results.
To reproduce the table, reset the calculator, change only the named input and compare the result and any warning. Record the assumptions with your result. See worked planning examples and our calculation and correction process.
Sources and review date
Rules and method reviewed 2026-11-01. Future changes are not automatically applied. Report a correction.