Free · private · no account required
Household cost tools
Track renewals, bring a bill or compare a quote. Use practical browser tools with your own numbers.
What would you like to work out?
Free tools for household bills, subscriptions, and savings. Use your own prices; example inputs are illustrative.
Electricity Cost Calculator
Compare appliance examples or custom usage in watts, kWh, and money. Include quantities plus daily or weekly operating time.
Open calculator →Subscription Cost Calculator
Turn weekly, monthly, and annual subscriptions into one budget. Compare what you keep and cancel.
Open calculator →Solar Payback Calculator
Compare self-use and export credits, maintenance, and upfront costs before evaluating a solar quote.
Open calculator →Compound Interest Calculator
Explore how a starting balance and monthly savings could grow under your assumptions.
Open calculator →Sunk Cost Decision Tool
Compare future costs and benefits when deciding whether to continue or switch.
Open calculator →Private Subscription Tracker
Track recurring payments and renewal dates, then export your list or calendar. Saved only on this device.
Open tracker →No account needed. Calculator inputs reset when you reload; the subscription tracker can save a list locally on your device.
Start with the job you need to finish
Use the subscription tracker to keep renewal dates and recurring payments in one private list. For an electricity bill, compare appliance power and running time. For solar, separate electricity used at home from exported electricity. Then explore what regular savings could become.
How to use the results
Run a conservative case and a higher-cost case. The difference shows which assumptions deserve checking. Electricity rates, solar production, and investment returns are inputs you supply, not live prices or predictions from this website.
Each tool explains how it handles your information. Calculators keep entries in the current page session. The tracker saves only to local browser storage when available and can export a portable CSV or calendar file.