Bishop said the tool would help show people how the decisions they made today would impact their future retirement.
The tool allows people to adjust their contribution rate from 3 to 4 or 8 per cent and then sends them an email which can be forwarded to a member's workplace to request a change be made through their employer.
If a member decides they need to change their investment fund it also allows them to do that online with the switchover occurring at the next valuation point for the fund.
The tool doesn't incorporate New Zealand Superannuation into its calculations at the moment but Bishop said it planned to add that ability in the future as well as the ability to incorporate other investments like shares or rental property which would give people a fuller picture of what income they could have in retirement.
Bishop said converting the KiwiSaver lump sum into an annual amount could show people the gap between what they currently earn and what they would get in retirement.
The tool is available to it members who are between the ages of 18 and 65.
Bishop said too many New Zealanders had not thought much about their KiwiSaver scheme since they initially enrolled, with many still in their default fund.
"KiwiSaver is a long-term investment, not a simple, set-and-forget savings account. It makes sense to focus on helping people visualise their retirement income."