Loan comparison calculator — compare equal-payment vs equal-principal, multiple loans side by side, total interest breakdown.
- Runs locally
- Category Calculator
- Best for Getting a realistic range before a purchase, plan, workout, or schedule decision.
| Plan A | Plan BCheapest by total interest | |
|---|---|---|
| First-month payment | ¥4,774.15 | ¥6,111.11 |
| Total interest | ¥718,695 | ¥601,667 |
| Total repayment | ¥1,718,695 | ¥1,601,667 |
| Interest / Principal | 71.9% | 60.2% |
| First-month interest | ¥3,333.33 | ¥3,333.33 |
| Last-month interest | ¥15.86 | ¥9.26 |
What this tool does
Compare up to four loan plans side by side: pick equal-payment (本息) or equal-principal (本金) per plan, type principal, annual rate, and term in months or years, and see monthly payment, total interest, total repayment, interest-to-principal ratio, plus first-month and last-month interest for every plan at the same time. The cheapest plan by total interest is highlighted automatically. An overlaid monthly-payment curve (drawn as inline SVG, no chart library) shows how equal-principal starts high and tapers down while equal-payment stays flat; a stacked principal vs interest bar chart makes the lifetime cost gap obvious at a glance. Three one-click presets cover the most common Chinese scenarios: a ¥1,000,000 30-year mortgage, a ¥300,000 5-year car loan, and a ¥500,000 10-year business loan. Math runs entirely in your browser — your numbers never touch a server, no signup, no logs, no ads on the calculation. Useful when you are deciding between two banks, two repayment methods, or whether a shorter term is worth the higher monthly cash flow hit.
Tool details
- Input
- Numbers
- The page exposes text boxes, numeric controls, file pickers, or structured inputs depending on the tool.
- Output
- Live result + Preview
- The result area focuses on usable output, with copy, download, or preview actions when supported.
- Privacy
- Browser-side processing
- The main tool logic does not call an external API, so inputs normally stay in the current tab.
- Save / share
- No account required
- Open the page and use it; whether results survive refresh depends on the tool.
- Performance budget
- Initial JS <= 30 KB
- No WASM budget is declared, keeping the tool quick to open on mobile.
- Best fit
- Calculator · Marketer
- Category and role tags drive related tools, internal links, and quick fit checks.
How to use
-
1. Input
Paste or drop your content into the tool panel.
-
2. Process
Click the button. All processing is local in your browser.
-
3. Copy / Download
Copy the result or download to disk in one click.
How Loan Comparison Calculator fits into your work
Use it for fast estimates, comparisons, and planning numbers before you make the final call.
Calculation jobs
- Getting a realistic range before a purchase, plan, workout, or schedule decision.
- Comparing scenarios by changing one input at a time.
- Turning rough assumptions into a number you can discuss.
Calculation checks
- Double-check units, dates, rates, and rounding assumptions.
- Treat health, finance, tax, and legal outputs as planning aids, not professional advice.
- Save the inputs that produced an important result so you can reproduce it later.
Good next steps
These links move the current task into a more complete workflow.
- 1 Expense Tracker Expense tracker — log spend, categorize, see monthly totals, all in your browser. Open
- 2 Mortgage Calculator Mortgage calculator — monthly payment, total interest, amortization schedule, early payoff scenarios. Open
- 3 China Income Tax Calculator China personal income tax calculator — monthly, annual, with 5 insurance + 1 fund deductions. Open
Real-world use cases
Two banks quote you the same rate but different repayment methods
Bank A offers ¥1,000,000 over 30 years equal-payment at 4.0%; Bank B offers the same loan equal-principal. Load both as plans and the table shows equal-payment total interest near ¥718,000 versus roughly ¥602,000 for equal-principal, a ¥116,000 gap. Month 1 on B is about ¥1,200 higher, so you decide whether your cash flow can absorb the early years to save six figures over the life of the loan.
Deciding whether a 20-year term beats a 30-year one
On a ¥1,000,000 mortgage at 4.0% equal-payment, set plan A to 30 years and plan B to 20 years. The monthly payment jumps from about ¥4,774 to ¥6,060, but total interest falls from roughly ¥718,000 to ¥454,000. Seeing the ¥264,000 saving next to the ¥1,286 higher monthly payment turns a vague gut call into a number you can defend at the signing desk.
Comparing a bank loan against a family loan
A bank offers you 30-year equal-payment and a relative offers 10-year equal-principal on ¥500,000 at a lower rate. Set them as two plans and read the total interest gap directly instead of juggling two calculators. The short equal-principal plan front-loads payments, so you can check whether the first-year monthly outflow still leaves you room for the car loan you already carry.
Sanity-checking a car loan offer before you sign
The dealer pitches ¥300,000 over 5 years and quotes a monthly figure without naming the method. Drop in the principal, rate, and term, flip between equal-payment and equal-principal, and see which one their quoted monthly matches. If the number lands between the two, the rate they told you is probably not the rate they are charging, and you have the exact total interest to push back with.
Common pitfalls
Comparing monthly payment alone and picking equal-payment because it is lower. On a ¥1,000,000 / 30-year / 4.0% loan that flat payment hides roughly ¥116,000 more total interest than equal-principal, so always read the total interest column, not just the monthly.
Entering the annual rate where the tool expects it but forgetting some banks quote a discounted first-year rate. Use the real long-term rate you will actually pay, or the total interest you see will be too rosy by tens of thousands.
Mixing up term in months and years across plans. Plan A at 30 years and plan B at 360 are identical, but plan A at 30 and plan B at 30 months are wildly different, so double-check the unit before trusting the highlighted cheapest plan.
Privacy
Every calculation runs entirely in your browser. Your principal, annual rate, and term never leave the page and are never sent to a server or written to any log. Nothing about your loan goes into the URL by default, so a shared link does not leak your numbers; close the tab and the inputs are gone. This is also why the calculator keeps working after you go offline.
FAQ
Tool combos
Folks in your role tend to reach for these alongside this tool.
- Age Calculator Calculate your exact age — years, months, days, hours. Compare two dates or count to a future date.
- AI Model Comparison AI model comparison — 20+ models (GPT / Claude / Gemini / Llama / Qwen) across price, context, speed, capabilities (2026).
- Avatar Generator Generate avatars from initials, identicons, or random shapes. Download PNG/SVG.
- Barcode Generator Code 128 / EAN-13 / UPC-A / Code 39 — generate scannable 1D barcodes, export SVG or PNG, fully offline.