Two of these work on the process, and two work on the money. Which pair you need depends on where you are. If the process is still running, or has just finished and you are weighing what to do about it, start with the first two. If a decision has been made and the question has become what it is worth, start with the calculators. All four are free, none asks for an email address, and every one of them runs entirely in your browser, so nothing you enter is sent to us or stored anywhere.
While the process is running
Once it is about the figure
A tribunal award and a settlement are two different figures, reached in two different ways, and most people asking about compensation are really asking about one or the other without realising it. A tribunal award is what a judge could give you if your claim succeeded: a formula applied to your salary, age and length of service, then reduced for the realities a contested hearing brings, such as the chance you would have been dismissed anyway and the statutory cap that currently applies. A settlement is a different question entirely: what your employer might pay to avoid that hearing, a commercial decision shaped by their size, their appetite for risk, and how strong your case looks on paper. Start with the tribunal figure if nothing has been offered yet. Start with the settlement tool if an offer is already on the table, or you expect one soon.