It could be your gateway to a pay rise - or it could give your boss an excuse to cut your salary.

A new online tool called ValueMyCV claims to be able to automatically analyse your resume and calculate how much you are worth to employers.

It was designed to take some of the guesswork out of negotiating a pay packet by providing a realistic estimate of what job seekers can expect to be paid for their experience and education.

Job search engine site Adzuna claims to be able to estimate how much you should be paid using the information in your CV. It uses text mining software to extract information about your skills and experience

Job search engine Adzuna built the tool and said it uses text mining software to scan the CV for information it needs to work out a person's employment history, skills and qualifications.

Text mining is commonly used to obtain useful information from the types of words used in a document, for example.

It then searches through data on thousands of job listings to give an estimate of what the going rate is for someone of their ability.

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The tool even features an ‘email my boss’ feature to allow users to send their result to their current employer.

While the tool could help those who feel they are under-rewarded, it could also have the opposite effect.

Tests by MailOnline showed the tool tended to search in the wrong employment sector for jobs, leading to inaccurate salary predictions.

Adzuna claims people’s CVs can often also let them down - a survey of 3,000 CVs found that at least a third contained spelling errors, for example.

They found the most commonly misspelt words were ‘responsibility’, ‘liaise’, ‘university’, ‘communication’, experience and management.

The research also found that 30 per cent of CVs also contained a gap in employment history.

Many resumes also failed to include a personal summary or a postal address.

ValueMyCV could help you negotiate a pay rise showing what you are really worth (image posed by models)

The tool allows users to import their CV as a Word document, PDF or several other formats for analysis

A spokesman for Adzuna said: ‘These mistakes may seem insignificant, but they can be the difference between being on the shortlist or in the bin.’

Fortunately, Adzuna’s ValueMyCV tool also offers tips on how to boost a CV to help people sell themselves and their skills better.

It even offers an option to help you pick a new career.

For any frustrated journalists out there, apparently a career swap to a martial arts instructor is an option worth considering based on Adzuna's Career Explorer feature.

Users can email their boss with their estimated worth (as shown in the image above) with a click of a button