Patient instruments
for serious money.
Eight financial calculators built for people who treat money as a craft — not a lottery ticket. No signup, no ads, no tracking. Just the math, rendered cleanly, with the formulas visible if you want to check the work.
Eight tools. Each one
does exactly one thing well.
No dashboards. No "AI insights." No upsell to a premium tier that does not exist. Pick the number you need to know, enter your inputs, read the result.
Mortgage Calculator
Monthly principal, interest, taxes, insurance, and PMI for any conventional mortgage — with a full amortization schedule.
Loan Calculator
Payment, total interest, and cost of borrowing for any installment loan — personal, student, or signature.
Compound Interest
The mathematical force behind every long-term fortune. Model principal, periodic contributions, and compounding frequency.
Retirement Calculator
Project your nest egg from current savings, monthly contributions, and expected return — then stress-test the withdrawal rate.
Savings Goal
Tell us the number and the deadline. We will tell you the monthly deposit that gets you there — or how close you will come.
Auto Loan
Monthly payment with trade-in, sales tax, registration, and fees — the true cost of driving off the lot.
ROI Calculator
Total return, annualized return, and cash-on-cash multiple for any investment with a holding period.
Break-Even Analysis
The number of units you must sell before a single dollar of profit appears — the line between red and black.
Finance software
should not shout.
Most financial calculators online are lead-generation funnels dressed up as tools. They want your email, your phone number, your mortgage balance — all to sell you a refinance you do not need.
Ledger is the opposite. The formulas are standard. The source is open. The results are exact for the inputs you give. If a number is wrong, it is wrong in a way you can trace, because every variable is visible.