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useful tools

Run the numbers before you read the article.

Three small calculators we built our selves — for the questions our readers ask most. No accounts, no tracking, just math.

Compound interest

What does saving today turn into tomorrow? Project a portfolio with regular contributions over decades.

Principal
$10,000
Monthly add · 7%/yr · 20 yr
$500
Future value
$300,400
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Annualized return

Cumulative profit, expressed as a clean yearly rate. The honest number for comparing investments.

Start → End
$25K → $48.7K
Held for
6 years
CAGR
11.78%
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Mortgage payment

A monthly principal-and-interest figure before tax and insurance. Compare terms in seconds.

Home price
$450,000
20% down · 6.4% · 30 yr
$360K loan
Monthly P&I
$2,251
Open calculator