What is the main difference between the two methods?

Equal total payment keeps the monthly total broadly level at a fixed rate, with more interest early on. Equal principal starts higher, falls each month and usually produces less total interest.

Why can the result differ from a lender schedule by a few yuan?

Lenders may round each period, use actual day counts, vary the first period or reset rates. This tool uses a fixed monthly rate at full precision and rounds only displayed amounts to cents.

Can it calculate a zero-interest loan?

Yes. Both methods divide principal evenly across all payments, total interest is zero and the payment difference is zero.

Does it model prepayment or variable rates?

Not in this version. Prepayment date, penalties, reset frequency and new rates all change the result and cannot be represented by one fixed-rate model.

Should I enter property price or loan principal?

Enter the amount actually borrowed. If you only know the property price, subtract the down payment and non-financed costs, then use the principal confirmed by the lender.

Does total interest include taxes, insurance or fees?

No. Total interest comes only from principal, fixed annual rate and term. Budget taxes, insurance, guarantee charges and service fees separately.

Mortgage calculator

Compare monthly payments, total interest and schedules for two repayment methods

Computed in your browser

Enter principal, whole-year term and contract annual rate. Results compare both repayment methods; the example rate is not a current quote.

Loan principal (CNY)

Loan term (1–40 years)

Contract annual rate (%)

3.5% is an example, not a current quote. Enter the annual rate from your offer or contract.

Repayment comparison

Equal total payment

Monthly payment: –
Total interest: –
Total repaid: –

Equal principal

First payment: –
Monthly decrease: –
Final payment: –
Total interest: –
Total repaid: –

–less interest with equal principal –higher first payment with equal principal

Monthly repayment schedule

Period	Payment	Principal	Interest	Balance

Example

Input

Principal: CNY 1,000,000 · Term: 30 years · Annual rate: 3.5%

Example result

Equal total payment: CNY 4,490.45/month and CNY 616,560.88 interest; equal principal: CNY 5,694.44 first payment and CNY 526,458.33 interest

The example assumes a fixed rate for 360 payments. The 3.5% input is illustrative, not a current market quote or recommendation.

Technical details & limits

Equal total payment uses P×r×(1+r)^n÷((1+r)^n−1). Equal principal repays P÷n principal each month and charges interest on the outstanding balance. The annual rate is divided by 12, with one payment per month and a fixed rate throughout. Taxes, insurance, fees, prepayment, penalties and rate resets are excluded. Calculations keep full precision while displayed amounts round to cents, so bank schedules that round each period can differ slightly.

About this tool

Enter principal, term and contract annual rate to compare equal-total-payment and equal-principal plans, including monthly payments, total interest, total repaid and a month-by-month breakdown. All calculations run locally in your browser.

Use cases

Compare early cash flow and lifetime interest for two common repayment methods before signing.
Sense-check a lender quote and spot differences in principal, term or rate assumptions.
Inspect how much principal and interest make up a payment and the balance after it.

How to use

Enter the actual loan principal in CNY, not the property price or a down-payment percentage.
Enter a whole-number term from 1 to 40 years and the annual rate from the offer or contract.
Compare payment, total interest and first-month burden, then switch schedule methods for monthly detail.

Input & output

Input: Principal above 0 and up to CNY 1 billion, a whole term of 1–40 years, and an annual rate of 0–100%.
Output: Summary figures for both methods and up to 480 rows of payment, principal, interest and balance.
Limits: Standard monthly payments at a fixed nominal annual rate only; rate changes, prepayment and extra costs are excluded.

Notes

Results are for comparison and checking, not approval, a quote or financial advice. Actual debits follow the lender contract, day-count rules and period-by-period rounding.

FAQ

What is the main difference between the two methods?: Equal total payment keeps the monthly total broadly level at a fixed rate, with more interest early on. Equal principal starts higher, falls each month and usually produces less total interest.
Why can the result differ from a lender schedule by a few yuan?: Lenders may round each period, use actual day counts, vary the first period or reset rates. This tool uses a fixed monthly rate at full precision and rounds only displayed amounts to cents.
Can it calculate a zero-interest loan?: Yes. Both methods divide principal evenly across all payments, total interest is zero and the payment difference is zero.
Does it model prepayment or variable rates?: Not in this version. Prepayment date, penalties, reset frequency and new rates all change the result and cannot be represented by one fixed-rate model.
Should I enter property price or loan principal?: Enter the amount actually borrowed. If you only know the property price, subtract the down payment and non-financed costs, then use the principal confirmed by the lender.
Does total interest include taxes, insurance or fees?: No. Total interest comes only from principal, fixed annual rate and term. Budget taxes, insurance, guarantee charges and service fees separately.

Related tools

Mortgage calculator · Compare monthly payments, total interest and schedules for two repayment methods — Mortgage calculator — Tool illustration · dayeku.com