Month-on-month rate
The change in the price index from the previous month, usually seasonally adjusted.
2 min read · Reviewed September 2026
In plain words
The month-on-month (MoM) rate shows how much prices moved in the last 30 days. It's noisier than the 12-month rate and is usually seasonally adjusted to strip out predictable patterns like higher food prices in winter.
Frequently asked questions
What is the month-on-month CPI rate?
The MoM rate measures the change in prices from one month to the next. Because it is very sensitive to short-term noise, it is usually seasonally adjusted and quoted alongside the 12-month rate for context.
Further reading