Fixed vs Variable Mortgage Calculator — MakeMyCred
FIXED VS VARIABLE MORTGAGE CALCULATOR

Fixed or variable rate — which actually costs less?

Compare a fixed-rate mortgage against a variable one. See what happens to your payment if rates rise, fall, or stay flat — and which option wins in the end.

Side-by-side comparison
Rate-change scenarios
Global currencies & rules

Rate type comparison

The principal you're borrowing. Both rate types finance the same amount.
≈ 360 monthly payments for both options
Fixed for the entire term — your payment never changes.
How long the fixed rate stays locked. In the US, this is the whole term. In the UK and Canada, it may be 2, 5, or 10 years.
Variable rates usually start lower than fixed rates.
Assumes the variable rate stays flat for the entire term.
Applied each year to the variable rate — up or down.
Some loans cap how high the variable rate can go.
Application, arrangement, or rate-lock fees for the fixed option.
Application, arrangement, or valuation fees for the variable option.
Too close to call
Under this scenario, the two options cost nearly the same.
Difference in total cost
$0
Total cost difference across the full term
Rate trajectory (per year)
Fixed
6.50%
Variable (start)
5.50%
Variable (end)
5.50%
Fixed rate
Monthly payment$0
Total interest$0
Upfront fees$0
Total cost$0
Variable rate
Monthly payment (start)$0
Monthly payment (end)$0
Total interest$0
Total cost$0
Fixed total interest $0
Variable total interest $0
Variable ending rate
Savings vs Fixed
YEAR-BY-YEAR COMPARISON

How the two options compare over time

Side-by-side year-by-year view of balance, interest, and cumulative cost for both rate types.

Year Fixed: Payment Fixed: Interest Fixed: Balance Variable: Rate Variable: Payment Variable: Balance

Figures are rounded to the nearest unit. The variable rate is assumed to change once per year based on the selected scenario. Actual variable rates move with market conditions.

HOW IT WORKS

Fixed vs variable — the real trade-off

Certainty versus flexibility. Both have merits — it depends on your situation.

1. What "fixed" and "variable" mean

A fixed-rate mortgage locks in your interest rate for a set period — often the entire term (US) or 2–10 years (UK, Canada, Australia). Your monthly payment never changes during the fixed period.

A variable-rate mortgage (also called floating or adjustable) moves with market rates. Your payment — or your remaining term, depending on the market — changes when the rate changes. It often starts lower than a fixed rate.

2. The trade-off in plain terms

  • Fixed: certainty. You know exactly what you'll pay. No surprises.
  • Variable: potentially cheaper. But you carry rate risk — payments can rise.

💡 The real question: is the initial saving on a variable rate worth the risk of future increases? This calculator models it directly.

3. Why variable rates usually start lower

Lenders price fixed rates with a "certainty premium" — they charge more to lock in a rate because they're taking on the risk of rates rising. Variable rates don't have that premium, so they start lower.

Typical difference: 0.5%–1.5% lower for variable. On a $320,000 loan, that's $100–$300/month lower initially — but it comes with risk.

4. Rate-change scenarios

A variable-rate mortgage's cost depends on where rates go:

Scenario What happens Who wins
Rates fallVariable payment drops furtherVariable rate — by a lot
Rates stay flatVariable stays lower than fixedVariable rate — modestly
Rates rise slowlyVariable creeps up toward fixedCould go either way
Rates rise sharplyVariable exceeds fixedFixed rate — clearly

5. How lenders handle rate changes

Different markets handle variable-rate changes differently:

  • US ARMs: the rate is fixed for an initial period (e.g., 5 years), then adjusts annually.
  • UK tracker / variable: the rate moves immediately with the Bank of England base rate.
  • Canada variable: the rate moves with prime — your payment or term adjusts.
  • Australia variable: the rate moves with the RBA cash rate — payment changes.
  • India: floating rates are linked to an external benchmark (like the repo rate).

6. When fixed makes more sense

  • Rates are expected to rise. Locking in before increases is the classic move.
  • Your budget is tight. Certainty matters more when there's less wiggle room.
  • You're risk-averse. Peace of mind has real value.
  • You plan to stay long-term. Fixed protects against decades of volatility.

7. When variable makes more sense

  • Rates are expected to fall. You'll benefit from declines.
  • You can handle payment swings. A 2%–3% increase wouldn't strain your budget.
  • You'll sell or refinance soon. Rate risk matters less over short periods.
  • You want lower initial payments. For cash flow or investment reasons.
  • Overpayments are a priority. Variable loans in many markets allow unlimited overpayment without penalty.

8. Common mistakes

  • Choosing variable for the lower initial payment only. If you can't afford it if rates rise, it's not the right choice.
  • Choosing fixed without comparing. Sometimes the fixed-rate premium is tiny — worth it. Sometimes it's huge.
  • Ignoring break fees. Fixed loans often have early repayment charges; variable loans usually don't.
  • Not stress-testing. Ask: "Can I afford my payment if the rate goes up 3%?" If no, variable is risky.
  • Forgetting that "fixed" isn't forever in some markets. A 5-year fixed in the UK resets to variable after 5 years — often at a much higher rate.

9. How to use this calculator

  1. Enter the loan amount and term.
  2. Enter the fixed rate offered by your lender.
  3. Enter the variable rate and choose a rate-change scenario.
  4. Set the rate change amount per year (or leave at 0 for "stays flat").
  5. Add any upfront fees for each option.
  6. Compare the total cost over the full term.

10. Final thoughts

There's no universally correct answer. Fixed and variable each win in different situations. What matters is matching the choice to your risk tolerance, your expected timeline, and your view on where rates are heading.

If rates rise, fixed looks brilliant. If they fall, variable does. The safest approach for most people: choose fixed if you can't absorb payment increases, and variable if you can — and if the initial savings are substantial.

WHAT MATTERS

Three factors that decide fixed vs variable

Focus on these to make the right choice for your situation.

Rate direction

If you expect rates to rise, fixed wins. If you expect them to fall, variable wins. If uncertain, fixed provides certainty.

Time horizon

Short horizon favors variable (less rate risk). Long horizon favors fixed (protection against decades of volatility).

Risk tolerance

If a 2%–3% payment increase would strain your budget, fixed is the safer choice regardless of rate outlook.

GLOBAL SUPPORT

How fixed and variable work around the world

Rates, terms, and rules vary widely. Here's the picture by market.

🇺🇸

United States

30-year fixed dominant

Fixed rates locked for the full term — a US specialty. ARMs (adjustable) also common. Variable typically resets after 3, 5, 7, or 10 years.

🇬🇧

United Kingdom

2–5 year fixes typical

Fixed rates usually last 2, 5, or 10 years — then revert to a higher standard variable rate. Tracker mortgages follow the BoE base rate.

🇨🇦

Canada

5-year fixed common

Mortgages typically renew every 1–5 years. Most borrowers choose a 5-year fixed. Variable rates track the prime rate.

🇦🇺

Australia

Variable common

Variable rates are popular; fixed rates usually 1–5 years. Variable rates move with the RBA cash rate.

🇮🇳

India

Floating dominant

Floating-rate home loans linked to repo rate or other benchmarks. Fixed-rate options exist but are less common.

🇩🇪

Germany

5–15 year fixes common

Long fixed periods standard. Variable rates exist but are used less for owner-occupied homes.

QUESTIONS

Frequently asked questions

Over 35 common fixed vs variable questions, answered for a global audience.

A fixed rate stays the same for a set period — your payment never changes. A variable rate moves with market rates — it can go up or down. Fixed usually starts higher; variable usually starts lower.

It depends. Fixed wins if rates rise or if you value certainty. Variable wins if rates fall and you can absorb payment increases. There's no universal answer — match it to your situation.

Lenders price in a "certainty premium" for fixed rates — they charge more to lock in a rate because they're taking on the risk of rates rising. Variable rates don't have that premium, so they start lower.

Usually 0.5%–1.5% lower than fixed rates in the same market at the same time. The exact gap varies with market conditions — sometimes it's wide, sometimes it's narrow.

Depends on the market. In the US, ARMs typically adjust annually after an initial fixed period. In the UK, tracker mortgages move immediately with the BoE base rate. In Australia and India, variable rates change whenever the benchmark changes.

Adjustable-Rate Mortgage — a US term for a variable rate with an initial fixed period (often 3, 5, 7, or 10 years), then a variable rate that adjusts periodically. Lower starting rate, but risk after the fixed period ends.

Your monthly payment increases — or, in some markets, your remaining term extends. Either way, you pay more. How much depends on the size of the rate change and your loan balance.

Yes — that's the whole point. It moves whenever the underlying benchmark moves. Some loans have rate caps (a maximum), and some have "teaser" rates that expire after a set period.

A limit on how high the variable rate can go. Common in US ARMs: "2/2/5" means the rate can rise 2% at each adjustment, 2% per year maximum, and 5% over the life of the loan. Caps provide protection but may come with a slightly higher starting rate.

A UK term for a variable-rate mortgage that follows a specific benchmark — usually the Bank of England base rate — plus a fixed margin. Moves immediately when the base rate moves.

In the UK, the default variable rate a mortgage reverts to after a fixed or tracker period ends. Usually much higher than the original fixed rate — so it's worth remortgaging before the fixed period expires.

Depends on your view of rates over the next 5 years. A 5-year fixed locks in certainty for a medium term — good if you expect rates to rise. A variable rate is cheaper if rates stay low or fall — but riskier if they rise sharply.

Depends on the rate cap and how high rates go. On a $320,000 loan, a 2% rate increase adds roughly $400/month. A 4% increase adds roughly $800/month. Stress-test this before choosing variable.

Usually yes — either by refinancing or by converting within the same lender. In some markets (like the UK), you can lock in a new fixed rate while still in a variable period. Fees may apply.

Yes, but if you're in a fixed period, you'll likely pay an early repayment charge — often 1%–5% of the outstanding balance. Variable loans typically have no such penalty.

Certainty. You know exactly what you'll pay every month for the fixed period. That makes budgeting easier and protects against rate rises. Especially valuable for first-time buyers with tight budgets.

Lower initial payments, greater flexibility (overpayments without penalty), and potential savings if rates fall. Popular with borrowers who can handle payment volatility and expect rates to stay low.

Yes. Larger loans magnify both the benefit and the risk. On a small loan, the difference between fixed and variable may be a few thousand over the term. On a large loan, it can be tens of thousands.

Yes — called a "split-rate mortgage." You fix part of the loan and leave the rest variable. Common in some markets as a way to hedge. It's like diversifying your rate risk.

Usually, but not always. Some variable rates are tied to the central bank's rate (trackers). Others are set by the lender (standard variable rate) and can move independently. Read your loan agreement to know which type you have.

Yes. When you refinance, you take out a new loan — and you can choose whether it's fixed or variable. Refinancing is a chance to switch rate types.

The period at the start of a variable-rate loan when the rate is fixed at a "teaser" level. After the initial period ends, the rate adjusts. Common in US ARMs and Australian fixed-then-variable products.

Absolutely. Before choosing variable, ask: "Can I afford my payment if rates rise 2%–3%?" If the answer is no, variable is risky. If yes, you have flexibility and can benefit from lower rates.

Charges for ending a fixed-rate loan early — common in the UK, Australia, and Canada. They cover the lender's loss if rates have fallen since you fixed. Variable loans usually don't have break fees, which is a flexibility advantage.

In many markets (UK, Canada, Australia), the loan automatically reverts to the lender's standard variable rate — usually much higher. You should remortgage or refinance before the fixed period ends to avoid this cliff.

In the US, yes — 30-year fixed means fixed for 30 years. In the UK, Canada, and Australia, "fixed" usually means fixed for 2, 3, 5, or 10 years, then reverts to variable. Always confirm the fixed period.

In some markets, yes. If rates rise and you keep the same payment, the term extends. In others, the payment rises instead to keep the term constant. Depends on the market and loan type.

Usually yes, without penalty. Variable-rate loans typically allow unlimited overpayments, which is a major flexibility advantage. Fixed loans often limit overpayments to 10% per year before charging a penalty.

No, but a larger deposit gets you a lower rate regardless of type. Fixed and variable are available at similar LTV bands, though the exact rate depends on your LTV, credit, and market conditions.

Yes, completely free. And everything runs in your browser — no data is uploaded or stored.

Currently US, UK, Canada, Australia, India, UAE, Singapore, and Germany. We plan to add New Zealand, Ireland, South Africa, and the Netherlands next.

No. All calculations happen in your browser. Nothing is uploaded, tracked, or stored.

This fixed vs variable mortgage calculator provides estimates for general guidance only. Actual rates, rate changes, fees, and terms depend on your lender's specific policies, your credit profile, and market conditions in your country. Rate-change scenarios are illustrative — actual rates will differ. This is not financial advice.

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