Caring can change work, travel, household costs and energy in ways that are hard to predict.
Start with what may change soon: paid hours, transport, home help, equipment, food, respite or support from others. Use low, likely and high estimates where the need is uncertain.
Protect the carer in the scenario
Do not assume every gap will be filled by unpaid time and effort. Include breathing room if you can, and name the support the scenario quietly depends on.
Check official benefit, leave and care information for your location. The calculator does not know what assistance you may be entitled to.