Share of Equity with 2 Partners

[Christopher Licciardi]

My 2nd wife and I purchased an expensive home together. She put up the entire down payment with her savings. All other costs are shared equally including taxes, maintenance, mortgage payments, etc. We both have children separately so a fair split of equity is important. We are looking for guidance on share of equity on sale. We have discussed an equity split based solely on total capital outlay for each of us. If over time she puts out $1,000,000 and I put out $500,000, her share of equity at sale would be double my share; 66.6% and 33.3% respectively. Would this be a standard way of calculation equity? Is there a standard that would apply?