Calculator

UK Mortgage & Loan Calculator

Compare capital-repayment and interest-only mortgages or model a personal loan with overpayments, yearly summaries, and a bounded monthly schedule.

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Property, mortgage and loan values are calculated locally in your browser and are not uploaded, stored, or tracked by Tool Teaze.

Step 1

Choose a calculator

Calculator mode

Step 2

Mortgage inputs

Changing either deposit field updates the other.
Mortgage amount£240,000.0080.00% loan-to-value (LTV)
Editable nominal rate; not a live lender offer or APRC.
Advanced options: overpayments and comparison
Applied after the scheduled monthly payment.
Modelled with the first monthly payment.
Overpayment allowances differ. Your lender might limit penalty-free overpayments or charge an early repayment charge. Check the mortgage or loan agreement before paying extra.

Alternative mortgage scenario

Compare a second deposit, rate and term using the same repayment type and overpayments.

Repayment estimate

Estimated regular monthly outlay

£1,334.00

Scheduled payment £1,334.00.

Cost breakdown

Principal, interest and term

Principal borrowed
£240,000.00
Interest payable
£160,199.38
Paid during modelled term
£400,199.38
Capital outstanding at term end
£0.00
Total cost including capital due
£400,199.38
Projected payoff
25 years
  • Principal 60.0%
  • Interest 40.0%

Overpayment comparison

With versus without overpayments

Interest without£160,199.38
Interest with£160,199.38
Estimated interest saved£0.00
Estimated time saved0 months

Mortgage comparison

Alternative scenario difference

Alternative borrowing: £240,000.00 at 5.5% for 25 years.

Monthly outlay difference
+£139.81
Lifetime interest difference
+£41,943.61
Total cost difference
+£41,943.61
Term difference
No change

Differences exclude arrangement, valuation, legal, broker, exit and early repayment fees. This is not a lender recommendation or switching quote.

Annual summary

Repayment by year

YearOpeningInterestPrincipalOverpaymentPaidClosing
1£240,000.00£10,691.23£5,316.75£0.00£16,008.00£234,683.26
2£234,683.26£10,446.97£5,561.01£0.00£16,008.00£229,122.26
3£229,122.26£10,191.52£5,816.47£0.00£16,008.00£223,305.80
4£223,305.80£9,924.31£6,083.66£0.00£16,008.00£217,222.12
5£217,222.12£9,644.82£6,363.15£0.00£16,008.00£210,858.97
6£210,858.97£9,352.51£6,655.48£0.00£16,008.00£204,203.49
7£204,203.49£9,046.74£6,961.23£0.00£16,008.00£197,242.26
8£197,242.26£8,726.95£7,281.04£0.00£16,008.00£189,961.23
9£189,961.23£8,392.46£7,615.50£0.00£16,008.00£182,345.72
10£182,345.72£8,042.61£7,965.37£0.00£16,008.00£174,380.35
11£174,380.35£7,676.69£8,331.30£0.00£16,008.00£166,049.05
12£166,049.05£7,293.93£8,714.03£0.00£16,008.00£157,335.01
13£157,335.01£6,893.62£9,114.35£0.00£16,008.00£148,220.65
14£148,220.65£6,474.91£9,533.07£0.00£16,008.00£138,687.58
15£138,687.58£6,036.96£9,971.03£0.00£16,008.00£128,716.56
16£128,716.56£5,578.88£10,429.08£0.00£16,008.00£118,287.47
17£118,287.47£5,099.78£10,908.20£0.00£16,008.00£107,379.28
18£107,379.28£4,598.65£11,409.31£0.00£16,008.00£95,969.96
19£95,969.96£4,074.52£11,933.43£0.00£16,008.00£84,036.50
20£84,036.50£3,526.31£12,481.69£0.00£16,008.00£71,554.82
21£71,554.82£2,952.90£13,055.08£0.00£16,008.00£58,499.74
22£58,499.74£2,353.13£13,654.81£0.00£16,008.00£44,844.90
23£44,844.90£1,725.84£14,282.13£0.00£16,008.00£30,562.77
24£30,562.77£1,069.73£14,938.24£0.00£16,008.00£15,624.51
25£15,624.51£383.45£15,624.50£0.00£16,008.00£0.00

Payment schedule

Monthly amortisation

Showing the first 12 of 300 modelled payments.

PaymentOpeningInterestPrincipalOverpaymentTotalClosing
1£240,000.00£900.00£434.00£0.00£1,334.00£239,566.00
2£239,566.00£898.37£435.63£0.00£1,334.00£239,130.38
3£239,130.38£896.74£437.26£0.00£1,334.00£238,693.12
4£238,693.12£895.10£438.90£0.00£1,334.00£238,254.22
5£238,254.22£893.45£440.54£0.00£1,334.00£237,813.67
6£237,813.67£891.80£442.20£0.00£1,334.00£237,371.48
7£237,371.48£890.14£443.85£0.00£1,334.00£236,927.62
8£236,927.62£888.48£445.52£0.00£1,334.00£236,482.10
9£236,482.10£886.81£447.19£0.00£1,334.00£236,034.91
10£236,034.91£885.13£448.87£0.00£1,334.00£235,586.05
11£235,586.05£883.45£450.55£0.00£1,334.00£235,135.50
12£235,135.50£881.76£452.24£0.00£1,334.00£234,683.26

Assumptions and sources

How this estimate works

  • The entered nominal annual rate is held constant and divided into 12 monthly compounding periods.
  • Capital-repayment instalments use the standard amortisation formula; the final payment is corrected so the balance cannot become negative.
  • A one-off overpayment is modelled with payment one. Regular overpayments are applied after each scheduled payment.
  • Interest-only payments cover interest on the current balance; only explicit overpayments reduce capital.
  • Currency is displayed to the nearest penny. Calculations retain unrounded internal values before result formatting.
  • Fees, changing rates, payment holidays, insurance, taxes, affordability checks and early repayment charges are excluded.

This educational estimate is not regulated personalised financial advice. A lender's offer, APR/APRC disclosure, payment timing and rounding can produce different results.

Authoritative UK terminology sources

Privacy: property, mortgage and loan values are calculated in this browser. Tool Teaze does not upload, store or track the financial values you enter.

What this tool does

This UK mortgage and personal-loan calculator estimates monthly payments, lifetime interest, total cost, overpayment savings, remaining capital, annual totals, and a monthly amortisation schedule.

How to use it

  • Choose mortgage or personal loan and enter the borrowing amount, illustrative annual rate, and term.
  • For a mortgage, enter a property price and deposit, then choose capital repayment or interest-only.
  • Open advanced options to model overpayments or compare another deposit, rate, and term.
  • Review the monthly estimate, cost breakdown, annual summary, and payment schedule.

Example input and output

Input: £300,000 property, £60,000 deposit, 4.5% rate over 25 years

Output: An estimated monthly repayment with total interest, overpayment comparison, and amortisation schedule

Common use cases

  • Estimating a first mortgage or remortgage payment
  • Comparing deposits, terms, and illustrative interest rates
  • Checking how regular or one-off overpayments could change interest and payoff time
  • Estimating a personal loan using a constant nominal annual rate

FAQ

How are mortgage and loan payments calculated?

Capital repayments use the standard monthly amortisation formula with the entered nominal annual rate divided across 12 compounding periods. Zero-interest borrowing is divided evenly. The final instalment is corrected to avoid a negative balance.

What is the difference between repayment and interest-only mortgages?

A capital-repayment mortgage pays interest and reduces capital each month. An interest-only mortgage normally pays only interest, leaving the capital due at the end unless explicit overpayments reduce it. You need a separate credible repayment plan for any remaining capital.

What does loan-to-value mean?

Loan-to-value (LTV) is the mortgage amount divided by the property value, expressed as a percentage. A larger deposit generally produces a lower LTV, but this calculator does not recommend or price lender products.

Are APR, APRC, and fees included?

No. The calculator models the editable nominal annual rate as constant. APR and mortgage APRC can reflect charges and assumptions that this estimate does not model. Arrangement, valuation, legal, broker, exit, insurance, and early repayment fees are excluded.

Can I overpay without a charge?

Not necessarily. Lender limits and early repayment charges vary by contract. The calculator shows mathematical savings before charges; check your agreement or ask the lender before making an overpayment.

Is this personalised financial advice?

No. It is an educational estimate, not a lender quote, product recommendation, affordability assessment, or regulated personalised financial advice.

Are my property and borrowing details private?

Yes. Calculations run locally in your browser. Tool Teaze does not upload, store, or track the property, mortgage, or loan values you enter.