Tools to decide whether to pay down debt

The problem, in plain words: “I have a 30-year mortgage and some extra money each month, and I want to figure out whether to pay down the mortgage or invest the money elsewhere.”

No tool in the catalog fully fits this yet.

You want a decision framework to compare extra monthly mortgage payments versus investing elsewhere.

Updated September 2026.

Partly fits

Prepayment Calculatorpartial · 52

It helps you quantify the payoff side by showing interest savings and loan-term impact from early repayment, which is one half of the mortgage-vs-invest comparison.

Won’t cover: It focuses on early mortgage repayment, not on projecting what investing would produce under conservative and optimistic return scenarios.

Compound Interest Calculatorpartial · 48

It supports the investing side by projecting investment growth over time from your assumptions, helping you run return-scenario comparisons.

Won’t cover: It projects investment growth, not the trade-off against mortgage interest saved from paying down a 30-year mortgage.

Nothing fully fits this yet

A tool that directly compares mortgage payoff value to investment scenarios using your inputs.

Questions

Is there a tool that fully solves this?

Not fully, yet. A tool that directly compares mortgage payoff value to investment scenarios using your inputs.

What won't these tools cover?

It focuses on early mortgage repayment, not on projecting what investing would produce under conservative and optimistic return scenarios. · It projects investment growth, not the trade-off against mortgage interest saved from paying down a 30-year mortgage.

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