Anyone applying a personal-finance rule of thumb who wants to see the actual numbers behind it, not just the round fraction.
Come funziona
- Name this check, e.g. "My numbers".
- For the Rule of 72, enter your expected annual interest rate.
- For the 28/36 rule, enter gross monthly income, monthly housing cost, and other monthly debt payments.
- See both rules applied with the real numbers, not just the rounded rule.
Cosa ottieni
- Rule of 72 next to the real formula (ln(2)/ln(1+rate)) - the rule is close near 8% but drifts in OPPOSITE directions above and below it, and this shows exactly how many years off it is at your own rate
- The 28/36 mortgage affordability rule checked as TWO separate conditions, not one - a housing cost that clears 28% on its own can still fail the 36% total-debt limit once other payments are added
- Each rule states plainly whether it passes or fails, with the number that decided it
- Checks saved by name: recalculating updates the same check, not a duplicate
Schermata

Dettagli tecnici
Come configurare e usare
- Acquista la licenza — la chiave (lic_...) appare nella pagina dell'ordine e via email.
- Accedi su app.synoriaai.com con la tua chiave di licenza.
- Nessuna installazione — il prodotto gira nel browser, sulla tua istanza isolata.
- Open the calculator and give your check a name.
- Enter your rate and your monthly gross income, housing cost, and other debt payments.
- Press Calculate to run the rules against your numbers.
- Read each rule's pass or fail result along with the number that decided it.
- Recalculate the same saved check whenever your numbers change.
Domande frequenti
What does this calculator actually do?
It applies a few common personal finance rules of thumb to the numbers you enter and shows whether each one passes or fails, along with the figure that decided it.
Does it store my financial numbers?
Checks are saved by name so recalculating updates the same check instead of creating a duplicate. The numbers you enter are used to run the rules and are kept with that saved check.
Is this financial advice?
No. It only applies rules of thumb and shows the arithmetic behind each result. It does not recommend products or tell you what to do.
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