Mortgage Calculators

Combination Mortgage Calculator

A piggyback structure (like 80-10-10) uses a second mortgage to avoid PMI with less than 20% down. Compare it against one loan with PMI.

Inputs

Home price

Down payment

First mortgage rate

Second mortgage rate

Loan term (years)

PMI rate (single-loan option)

Estimates only. Change any value to recalculate instantly.

Lower monthly payment Piggyback (80-10-10) saves $155.26/mo

Piggyback payment $2,330.18

Single loan + PMI $2,485.44

First / second loans $320,000 / $40,000

PMI avoided $210.00 /mo

Monthly payment compared

Piggyback $2.3k
Single + PMI $2.5k

Loan balance Piggyback (1st + 2nd)Single loan

A piggyback splits financing into an 80% first mortgage and a smaller second to avoid PMI with under 20% down. It works when the second loan's cost is less than the PMI it replaces — here, the piggyback wins.

Balance by yearView table

Year	Piggyback balance	Single-loan balance
1	$356,121	$355,976
2	$351,976	$351,683
3	$347,545	$347,102
4	$342,811	$342,214
5	$337,751	$337,000
6	$332,343	$331,435
7	$326,564	$325,498
8	$320,386	$319,164
9	$313,783	$312,405
10	$306,725	$305,194
11	$299,180	$297,500
12	$291,115	$289,290
13	$282,493	$280,531
14	$273,276	$271,185
15	$263,422	$261,213
16	$252,888	$250,573
17	$241,624	$239,221
18	$229,581	$227,108
19	$216,704	$214,184
20	$202,935	$200,395
21	$188,212	$185,682
22	$172,467	$169,984
23	$155,630	$153,234
24	$137,623	$135,363
25	$118,364	$116,295
26	$97,767	$95,950
27	$75,736	$74,242
28	$52,171	$51,081
29	$26,964	$26,368
30	$0	$0

How this calculator works

This calculator runs entirely in your browser — nothing you enter is sent anywhere, and there is no sign-up. Change any input and the result, breakdown, and schedule update instantly.

Rate and cost fields are pre-filled with current benchmarks (Federal Reserve / Freddie Mac via FRED (St. Louis Fed)), so your first result is already realistic — replace them with your own quote to see your numbers. To weigh one option against another, use the loan comparison calculator.

30-year fixed mortgage rate, 2019–2026

Source: Freddie Mac PMMS via FRED. Annual averages; latest weekly reading shown.

Common questions

Is this calculator free, and do I need to sign up?

Yes and no — it is completely free and asks for no account or personal details. Every calculation happens in your browser, so nothing you type is stored or sent to us.

How accurate are the results?

The math is exact for the inputs you give it, but the defaults are national benchmarks — your real rate, fees, taxes, and insurance will differ. Treat the result as a close estimate to refine with a real quote.