Great calculator though but I must say, still lack of profit details. The profit details in the graph could lead to USD or BTC. Although it is stated BTC above it.
Profits are always in BTC. Expressing profits in local currencies like USD, EUR, Chinese Yuan, etc, makes no sense since you could always by and hold BTC at the moment of the purchase, in which case profits in fiat are wrong because they don't count for long-term BTC rise. There's no need for any other option, and if you look closely no profit calculator express it in local currencies.