Loan Calculators
Run the numbers before you sign
Four calculators that answer the four questions members actually ask: what will it cost per month, when will it be gone, is consolidating worth it, and how much can I comfortably carry.
Which calculator you need
Each one takes about a minute and none of them ask for personal information or touch your credit.
Payment calculator
Enter an amount, a rate, and a term to see the monthly payment and the total interest. Use it to compare terms side by side before you apply.
Payoff calculator
Start from a balance you already carry and find out how much sooner it disappears if you add a fixed amount to every payment.
Consolidation calculator
List up to six balances with their rates and minimums. It returns your blended rate and tells you whether one loan would beat it.
Affordability calculator
Work backward from your income and existing obligations to a payment that keeps your debt-to-income ratio in a range lenders are comfortable with.
Payment and payoff, worked through
Two examples using real Summit pricing so you can see what the tools return.
Payment calculator: a $20,000 personal loan, entered once and compared across every available term. The monthly figure falls as the term lengthens, but the total interest climbs by more than $2,000 between the shortest and longest option.
Payoff calculator: a $9,400 credit card balance at 22.99% APR, currently paid at the $235 minimum. The tool shows what happens when you add a fixed amount on top of it every month.
Consolidation and affordability, worked through
The two calculators members most often skip, and the two that change decisions most.
Consolidation calculator: four balances totaling $14,600 at a blended 23.4%, replaced by a single 36-month loan at 9.74% APR. The tool compares total interest under each path rather than just the monthly payment.
Affordability calculator: a household earning $6,400 a month gross, already paying $1,850 on a mortgage and $410 on an auto loan. The tool works backward from a target debt-to-income ratio to a payment you can carry.
Rates current as of July 2026 and subject to change. Membership eligibility required. This is a demonstration website; rates, products, and figures shown are illustrative only.
Getting a useful answer out of them
Start with the affordability tool
Decide what you can carry before you decide what you want to borrow. Doing it in the other order is how members end up stretched.
Use a real rate, not a hopeful one
Check your rate with a soft pull first, then bring that number into the calculator. Estimates built on an aspirational APR are not useful.
Compare total interest, not just payment
A longer term always looks better monthly. The payment calculator shows total interest alongside it so the tradeoff stays visible.
Test one extra payment a year
Run the payoff tool with a single additional payment each year. On most loans it removes several months from the schedule at almost no strain.
Common questions
Do the calculators affect my credit?
No. They run entirely in your browser, ask for no personal information, and never contact a credit bureau. Only the rate check involves an inquiry, and that one is a soft pull.
How accurate are the results?
The math is exact for the inputs you give. What varies is the rate, which depends on your credit profile, so a calculator result is an estimate until you check your actual rate.
What is a debt-to-income ratio?
Your total monthly debt payments divided by your gross monthly income. Most lenders, Summit included, prefer to stay at or below 43%, and members are generally more comfortable near 36%.
Does the payoff calculator handle several debts at once?
It handles one balance at a time. For multiple debts, use the consolidation calculator, which computes your blended rate and compares it against a single loan.
Are taxes and insurance included?
Not in these tools. They cover principal and interest only. For a mortgage estimate that includes taxes, insurance, and escrow, use the mortgage calculator on the home lending pages.
Can someone walk through the numbers with me?
Yes. Member advisors will sit down with your figures at any of our 42 branches or by phone, and there is no charge or obligation for the conversation.
Get a real rate to work with
Check your rate in about two minutes with no impact to your score, then bring that number back to the calculators.