Mortgage overpayment calculator

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I'm trying to plan for a mortgage overpayment but the amount I can plan to repay will vary every year as my other commitments change e.g other loans etc.

I know there are lots of mortgage overpayment calculators on line but does anyone know if one that you can vary the amount of the over payment over the life of the mortgage?

Thanks

You can download this spreadsheet (link below). It is not online calculator per se, but it is much more useful than those online calculators. I used this spreadsheet to plan my mortgage overpayment and compare mortgage offers: www.locostfireblade.co.uk/spreadsheet/Index.html