fund investment calculator?

[kenmoremmm]

is there a calculator out there that would allow you to enter a date, amount, and pick a fund (VTSAX, for example), and see what your returns would have been?

[MDM]

If you are willing to accept a starting month instead of a starting day, see Portfolio Visualizer.

[Radagast]

Morningstar lets you compare many funds and exact dates, but only for 10k lump sum, and not a portfolio of many funds.
http://quotes.morningstar.com/chart/fund/chart.action?t=VWAHX&region=usa&culture=en-US&dataParams=%7B%22zoomKey%22%3A9%2C%22version%22%3A%22US%22%2C%22showNav%22%3Atrue%2C%22defaultShowName%22%3A%22name%22%2C%22mainSettingId%22%3A%22main%22%2C%22navSettingId%22%3A%22nav%22%2C%22benchmarkSettingId%22%3A%22benchmark%22%2C%22sliderBgSettingId%22%3A%22sliderBg%22%2C%22volumeSettingId%22%3A%22volume%22%2C%22defaultBenchmark%22%3Afalse%2C%22id%22%3A%22FOUSA00FSS%7CFOUSA00L83%22%2C%22type%22%3A%22FO%7CFO%22%2C%22region%22%3A%22USA%22%2C%22name%22%3A%22XNAS%3AVWAHX%7CXNAS%3AVTSAX%22%2C%22baseCurrency%22%3A%22USD%22%2C%22defaultBenchmarks%22%3A%5B%22%24FOCA%24ML%24%24%7CMuni%20National%20Long%7CCA%5DFO%22%2C%22XIUSA000MO%7CBBgBarc%20Municipal%20TR%20USD%7CXI%22%5D%2C%22chartType%22%3A%22growth%22%2C%22startDay%22%3A%2205%2F04%2F2008%22%2C%22endDay%22%3A%2205%2F03%2F2018%22%2C%22chartWidth%22%3A955%7D