💡 The jeonse-to-monthly-rent conversion formula is simpler than it sounds — and once you understand it, comparing housing costs in Korea becomes a lot less confusing.
Why the Conversion Rate Matters More Than You Think
When I first started looking at apartments in Seoul, I was genuinely baffled. One listing showed a 300 million KRW jeonse deposit. Another nearby unit wanted 600,000 KRW per month with a smaller deposit. How on earth do you compare those two?
This is the exact problem the jeonse-to-monthly-rent conversion rate was designed to solve. It’s a formula — simple in theory, occasionally confusing in practice — that lets you translate a jeonse deposit into an equivalent monthly rent (and vice versa). Once you get this, the whole Korean rental market starts making much more sense.
Here’s the thing: most first-time renters, especially those coming from outside Korea or moving out of a family home, skip this step entirely. Then they sign a contract without really knowing if they got a good deal. Don’t be that person.
💡 The conversion formula: Monthly Rent ≈ (Jeonse Deposit × Conversion Rate) ÷ 12 — the rate typically ranges from 4% to 6% annually depending on market conditions.
The Formula Itself — And How to Use It
The standard conversion formula looks like this:
Monthly Rent = (Jeonse Deposit × Annual Conversion Rate) ÷ 12
The conversion rate is essentially a proxy for the opportunity cost (or cost of borrowing) on the deposit amount. If the landlord could earn 5% per year by investing your deposit, then that 5% becomes the baseline for how much monthly rent they’d need to accept instead.
A Concrete Example
Let’s say a studio apartment in Mapo-gu, Seoul is listed at a jeonse deposit of 250 million KRW. You want to know what that equates to in monthly rent.
- Jeonse deposit: 250,000,000 KRW
- Conversion rate used: 5% (a commonly referenced benchmark)
- Annual equivalent rent: 250,000,000 × 0.05 = 12,500,000 KRW
- Monthly equivalent: 12,500,000 ÷ 12 = ~1,042,000 KRW/month
So if the landlord is offering a wolse (monthly rent) alternative at 900,000 KRW/month with a 50 million KRW deposit, you’d need to factor in that 50 million too — subtract the smaller deposit from the jeonse figure first, then apply the formula to the difference.
The rate you plug in matters — a lot. At 4% vs 6%, the same deposit produces very different monthly equivalents. Which brings us to the part most people gloss over.
flowchart TD
A[Start: Know the Jeonse Deposit Amount] --> B[Determine Applicable Conversion Rate\n4%–6% based on region and market]
B --> C[Apply Formula:\nDeposit × Rate ÷ 12]
C --> D{Comparing to a Wolse Listing?}
D -->|Yes| E[Adjust for Partial Deposit Difference\nDeposit Gap × Rate ÷ 12]
D -->|No| F[Use as Standalone Monthly Cost Estimate]
E --> G[Compare True Monthly Costs Side by Side]
F --> G
G --> H[Factor in Tax Deductions and Loan Costs]
H --> I[Final Decision: Jeonse or Monthly Rent?]
The Rate Varies — Here’s Why That’s Important
In Seoul’s high-demand neighborhoods — Gangnam, Mapo, Yongsan — landlords tend to use lower conversion rates because they have pricing power. They’d rather keep a large jeonse deposit working for them than accept a smaller monthly rent. In mid-tier or regional cities, the rates tend to run higher.
Earlier this year, I went through rental listings across three different platforms for a mid-size apartment in Suwon. The implied conversion rates embedded in the landlords’ asking prices ranged from 4.2% to 5.8%. That’s not a small variance — it directly affects whether jeonse or monthly rent saves you money.
Honestly, I’m still not 100% certain there’s a universally “correct” rate at any given time — it shifts with interest rates, housing policy, and local demand. But 5% is a reasonable middle-ground estimate when you’re doing quick back-of-envelope math.
💡 When the Bank of Korea base rate is high, jeonse becomes more expensive to finance with loans — which can push more tenants toward monthly rent and shift landlord pricing accordingly.
Can You Use This Formula in Reverse?
Yes — and this is actually useful for landlords and investors too. If you’re paying 800,000 KRW per month in rent, the implied deposit equivalent at 5% is:
(800,000 × 12) ÷ 0.05 = 192,000,000 KRW
That means if a landlord offered you a jeonse at 180 million KRW, you’d technically be getting a slightly better deal than the monthly rent option (at that rate). Whether you have that kind of capital sitting around is a different question entirely — but at least now you’re comparing apples to apples.
xychart
title "Monthly Rent Equivalent by Deposit Size and Rate"
x-axis ["100M", "150M", "200M", "250M", "300M", "400M"]
y-axis "Monthly Rent Equivalent (KRW 10k)" 0 --> 250
bar [42, 63, 83, 104, 125, 167]
line [50, 75, 100, 125, 150, 200]
A friend of mine in their early 30s spent almost two months going back and forth between a jeonse and a monthly rent option on the same street in Incheon. They were so focused on the nominal numbers — “this one feels cheaper” — that they never actually ran the conversion. When I helped them do it, it turned out the monthly rent option was the better deal by roughly 80,000 KRW per month after factoring in the opportunity cost of the deposit. Not massive, but over two years, that’s almost 2 million KRW.
Has anyone else found that just knowing the formula changed how they approached apartment hunting? It’s one of those things that feels obvious in retrospect — but until you see the math laid out, it’s easy to just go with gut feel and hope for the best.
Related Articles
- Jeonse vs Monthly Rent: How Income Level Affects Savings
- Jeonse Loan vs Monthly Rent: Financial Simulation
- Jeonse vs Monthly Rent: Asset Size Comparison
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