Free household money calculators
Practical household calculators for real money decisions
Smart Money Machine AI is a growing collection of free, browser-based calculators for everyday household decisions: electricity bills, German net salary, Elterngeld, heating costs, solar payback, commuting costs, and country-specific electricity estimates.
The calculators are designed to be useful before you create an account, buy anything, or share personal data. Each tool starts with practical defaults, shows the assumptions behind the result, and links to related calculators when a nearby decision matters more than the first estimate.
Estimate household kWh, tariff cost, and appliance impact. German salary net pay
Compare gross salary, tax class, and monthly take-home pay. Elterngeld planning
Model Basiselterngeld, ElterngeldPlus, and family cash-flow months. Electricity by country
Choose US, UK, Singapore, India, Hong Kong, France, or Netherlands.
How these calculators are different
- No login required: tools work directly in the browser.
- Country-specific defaults: pages avoid pretending that one tariff or tax model fits every market.
- Transparent estimates: results are practical planning aids, not financial advice.
- Privacy-conscious: calculator inputs are meant for quick estimates, not account profiling.
Start with the calculator closest to your decision, then adjust the assumptions that actually change your household result.