Uprate a legal sum — a debt, a court award or a guarantee — from one year to another using the ONS Consumer Prices Index (CPI).
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Enter the amount, the start year and the target year.
Uprating uses the ONS Consumer Prices Index (CPI): updated amount = amount × (CPI end / CPI start). Useful for updating a debt, court award or guarantee to today's money.
10,000 £ (2020) → 12,725.06 £ (2025)Indicative legal figures, not advice. Results are estimates — the final uprating depends on the official ONS indices and, in a dispute, on the court. Check the law in force. Instant in-browser calculation, no account.
Last updated: 11 July 2026 Source: ONS — Consumer Price Inflation
§ Results are for informational purposes and do not constitute legal advice. For specific situations, consult a lawyer or a notary.
The updated amount comes from the original amount and the ratio of the CPI in the target year to the CPI in the start year:
For a £10,000 award from 2015 uprated to 2024 (CPI 100 → 133): 10,000 × (133 ÷ 100) = £13,300, i.e. +33% cumulative inflation (£3,300 more).
It is recalculating a sum of money in line with the rise in prices so it keeps the same purchasing power. It uses the ONS Consumer Prices Index (CPI) between the start year and the target year.
Multiply the original amount by the ratio of the CPI in the target year to the CPI in the start year. For example, £10,000 with a CPI rising from 100 to 133 becomes 10,000 × (133 ÷ 100) = £13,300.
Typically when a contract, statute or court order provides for a sum to be uprated — a debt, damages or money to be repaid — so its value is not eroded by inflation between when it fell due and when it is paid. A court may also award interest on top.
CPI is the government's headline measure and is used for most uprating. RPI is an older index that tends to run higher and is still written into some contracts and index-linked instruments; check what the agreement or order specifies.
No. Inflation uprating restores the sum's purchasing power, whereas statutory interest is a charge for late payment. A court may, in some cases, award both the uprated sum and interest.