Best ways to estimate refund with planned marriage

My fiancé and I will be getting married in about a month. We have both been paying taxes if we were single filers. I have a substantially larger amount of income compared to my partner (I will make 5x their income be years end). 
With myself paying 5/6 of our joint income and paying as if I’m a single filer all year, and my partner doing the same for the other fraction, what is the best way to calculate the tax implications of being wed? There are other factors at play but I’d like to know what tools are recommended. 

I’ve tried using the tax estimator through Intuit but it doesn’t take into account the taxes we’d been paying as an input to the tax refund estimator. 

Additionally, if other tax incentivized activities (like insulating a house, purchasing an electric car, etc) were purchased there is not a convenient way to calculate the tax implications. Again, what tool is recommended for use?