# What does waiting a week cost a house you haven't bought yet?

On a $320,000 loan the monthly payment is $2,153 at today's average rate and $2,186 at DataSnack's number for seven days from now, $33 more a month.

At the national average rate for a 30-year fixed loan, principal and interest only.

- Now: $2,153
- In seven days: $2,186

## The working

The monthly principal and interest on a 30-year fixed loan at today's average 30-year rate, and at DataSnack's number for that rate seven days from now.

| Step | Expression | Now | In seven days |
| - | - | - | - |
| Monthly principal and interest | `pmt(rate / 1200, 360, loan)` | $2,153 | $2,186 |
| Paid over 30 years | `payment * 360` | $774,958 | $787,053 |

Each name in an expression is an input below or an earlier step.

## What this runs on

### DataSnack's models

- `rate`: [30-year mortgage rate](https://datasnack.ai/m/ch:0790d5aab537), 7.11% now (2026-11-12), 7.27% in seven days

### Your assumptions

- `loan`: Loan amount, $320,000 (change it on the page)

Every model here is graded in public. Download the workbook and rebuild it.

## What this cannot tell you

It does not include taxes, insurance or fees, and it says nothing about the rate a given lender would offer.

## The record

The first answer is graded seven days after it is made.

Data: [CSV](https://datasnack.ai/feed/q/house-waiting-cost.csv) · [JSON](https://datasnack.ai/feed/q/house-waiting-cost.json) · [Workbook (Excel)](https://datasnack.ai/feed/q/house-waiting-cost.xlsx)

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Canonical: https://datasnack.ai/q/house-waiting-cost · Updated 13 Nov 2026 12:00 UTC · DataSnack forecasts are analysis, not investment advice.