Tools
Free household finance tools.
Small, focused calculators built for the SharedNest community. No sign-up, nothing stored — everything runs in your browser.
For couples & shared households
Six tools for fair splits, who pays what, food budgets and moving in together.
Couples' fair-share calculator
Split rent, bills and groceries in proportion to what each of you earns, and see what each person keeps.
Open tool“Who pays what?” monthly planner
Assign each bill to one person and get the single monthly transfer that keeps the month fair.
Open toolShared grocery budget estimator
A realistic food budget for your household size, shopping style and local prices.
Open toolLiving together vs. living alone
Two solo budgets next to one shared one, with the monthly and yearly difference.
Open toolBill split calculator
Compare an income-based split with 50/50 and see what share of each income the shared bills really take.
Open toolRent split calculator
Split rent fairly between partners or roommates with an income-weighted share, next to the 50/50 version.
Open toolFinancial freedom calculator
Your savings rate, your freedom number and how many years until your investments cover your spending.
Open toolEmergency fund calculator
How many months of essentials your household should hold, and how long the gap takes to close.
Open toolMoney conversation starter
A question deck for couples and co-parents, sorted by relationship stage and topic.
Open tool