* Location: Salaries are generally higher in areas with a higher cost of living. London and the South East of England, for example, will pay more than rural areas in the UK. This applies internationally as well.
* Experience: More experienced Headmasters command higher salaries.
* Size of school: Larger schools often offer higher salaries.
* Type of school: Independent (private) schools typically pay significantly more than state schools. Grammar schools may also pay more than other state schools.
* Country: Salary levels vary greatly from country to country.
Therefore, it's impossible to give a single figure. To get a more accurate estimate, you would need to specify the location, type of school, and experience level of the Headmaster.
To find salary information, you could try searching online job boards for Headmaster positions in a specific area, or looking at government salary scales (if applicable to state schools in your region). Union websites for educators might also provide salary data.