A quiet, offline reference for households planning a large purchase or a long stretch of saving. Three instruments (a mortgage schedule, a compound growth illustration and a net-worth statement) are set in the manner of an annual report and run entirely in your browser.
This certifies that the bearer is entitled to one honest calculation, to be repeated as often as wished, without charge, without registration, and without a single figure leaving the page.
Instruments
Three
Accounts required
None
Figures sent anywhere
None
The contents of the folio
The three instruments
Each instrument is a single page with a single purpose. Every figure you see is computed from numbers you typed; the starting values are labelled examples that you are expected to overwrite.
I
Mortgage Amortization Schedule
Enter a loan amount, a yearly rate, a term and an optional extra monthly payment. Read off the regular payment, the full month-by-month schedule, the balance curve, and the interest an extra payment would spare you.
Begin with a sum, add a fixed amount each month, choose a yearly rate and a horizon. Contributions and growth are drawn apart, with a band two points either side, labelled for what it is: an illustration, not a forecast.
Itemise what you own and what you owe, in lines you name yourself. Totals, the debt-to-asset ratio and your net position update as you type, and the statement is kept in this browser only, for you alone.
Use whole dollars and the yearly percentage rate as a lender would state it. Leave out symbols if you like; the instruments forgive commas, dollar signs and stray spaces.
2
Read the whole schedule
A single payment figure hides the shape of a loan. The schedule shows how much of each payment is interest at the start and how little remains at the end.
3
Test the assumptions
Change one number at a time. A point on the rate, a few years on the term, or a modest extra payment each month can move the totals by more than intuition suggests.
From your own ledger
Your statement at a glance
No statement has been saved in this browser yet. When you prepare one on the net-worth page, a summary will appear here, drawn from this device alone.