Loan calculator

A loan calculator for the full cost before you commit.

Put principal, rate, term, fees, and extra payments on one editable page so different borrowing choices are easier to compare.

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Local-first calculations
iOS, Mac & Android

Auto Loan & Early Payoff Simulation

Adjust extra monthly principal and compare payoff time and total interest

Compare the borrowing choices
Extra monthly payment+$150.00
Scheduled monthly payment$543.07
Estimated payoff time46 months
Interest saved$997.61
Financed Loan Principal: $28,500.00Estimated Interest With Extra Payments: $3,086.51
Vehicle Purchase Price$38,000.00
Trade-in & Down Payment (25%)-$9,500.00
= $38,000.00 × 25%
Financed Loan Principal$28,500.00
= $38,000.00 - $9,500.00
Estimated Interest With Extra Payments+$3,086.51
= 60 months · 5.4% annual rate · +$150.00
Documentation & Registration Fee+$650.00
Total Cost With Selected Payoff$41,736.51
Why it fits

Monthly payment is only one part of the decision

A loan comparison is clearer when the payment, total interest, upfront costs, and payoff changes stay together.

01Include the full setup

Common calculator

A monthly quote can leave fees and purchase costs out of view.

FlexiCalc

Keep the loan inputs and upfront costs on the page.

02Compare the schedule

Common calculator

Two payments may look similar while their total interest differs.

FlexiCalc

Review payment, term, and interest as linked results.

03Test extra payments

Common calculator

It is hard to estimate the effect of paying more each month.

FlexiCalc

Change the extra amount and compare the new payoff path.

Dynamic Interest & Term Formulas

Model different loan terms (36, 48, 60, or 360 months) with flexible APR formulas.

Extra Payoff Impact Modeling

See the compound effect of paying extra principal each month or lump-sum bonuses.

Side-by-Side Lender Comparison

Compare Offer A (Lower Rate + Higher Fees) vs Offer B (Zero Fees + Higher APR).

How a loan calculator works

See the full cost before you commit

Put payment, interest, fees, and extra repayments on the same page to compare the borrowing choices.

  1. 01

    Enter the terms

    Add principal, rate, term, down payment, and upfront costs.

  2. 02

    Read the schedule

    Review the payment, total interest, and other purchase costs.

  3. 03

    Test a change

    Try a different term or extra payment and compare the outcome.

Designed for Real-World Tasks

Calculate with Context & Clarity

Mortgage & Home Financing

Mortgage

Model 15-year vs 30-year fixed mortgages, property tax, and PMI insurance.

Home Price - Down Payment -> Loan Amount + Interest + Escrow

Car Loans & Dealer Financing

Auto

Compare dealer 0.9% APR financing vs cash rebate incentives.

Vehicle Price - Trade-in Value -> Financed Amount

Credit Card & Debt Consolidation

Debt

Calculate how quickly you can pay off high-interest balances with fixed monthly snowball payments.

Debt Balance - Monthly Payoff -> Remaining Principal

Student Loan Repayment Strategies

Education

Test standard 10-year repayment versus accelerated payoff schedules.

Tuition Balance @ 4.8% APR + Extra $200 Monthly Payment
Guides & Tutorials

Explore Detailed Walkthroughs

View all docs

Loan Interest Calculator Guide

Understand how annual percentage rates (APR) and amortized interest work.

Read Guide

Extra Payments Loan Guide

Master dynamic modeling to shave years off your debt with extra monthly payments.

Read Guide

Debt Payoff Calculator Guide

Strategies for eliminating multiple credit card and personal loan balances.

Read Guide
Guides & Tutorials

Continue with a calculation page

Edit without rebuilding

Build a calculation page once, then change prices, rates, or quantities and follow the linked results without retyping the work.

Explore feature

A budget you can revise

Plan income, bills, flexible spending, and savings on an editable budget page that you can revise as the month changes.

Explore feature

A readable calculation path

See inputs, intermediate values, and linked results in readable rows so you can check how a calculation reaches its answer.

Explore feature
FAQ

Frequently Asked Questions

Everything you need to know about calculating with FlexiCalc

Can I simulate extra monthly payments to see how much interest I save?
Yes. You can add extra payment rows and see how they reduce the principal balance and total interest over time.
Can I compare two loan options side-by-side?
Yes. You can build Bank Option A (e.g. 5.2% APR) and Bank Option B (e.g. 5.8% APR with zero closing costs) on the same page for clear comparison.
Does it calculate upfront fees and closing costs?
Yes. You can add origination fees, appraisal costs, taxes, and registration fees directly to your calculation to see total out-of-pocket cash.
Is my financial data stored privately?
Yes. Loan calculations can be kept on your device for local-first work; review the app settings for any sync you choose to enable.
FlexiCalc

Make every calculation clear, editable, and reusable

Download FlexiCalc to model budgets, loans, quotes, and everyday decisions on pages that update with you.

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