Last updated: April 25, 2026
Loan-to-value ratio is the single most important number on any crypto loan. It controls how much you can borrow, what rate you get, and when your collateral gets liquidated. Yet most borrowers nod through it on signup without really doing the math. This guide walks through the LTV calculation in plain English with worked examples for BTC, ETH, and USDC collateral, explains the three LTV thresholds every borrower needs to track, and gives you the simple formula to monitor your own loan.
The basic LTV formula
LTV in one sentence: your loan balance divided by the current value of your collateral, expressed as a percentage.
LTV = (Loan principal + accrued interest) / (Collateral quantity × current price) × 100
Two things to notice. First, the loan side includes accrued interest, not just original principal. Second, the collateral side uses current price — so as crypto price moves, your LTV moves with it, even if you are paying down nothing.
Worked example: BTC collateral
You hold 1 BTC. The current price is $100,000. You take out a $50,000 loan against it.
- Collateral value: 1 BTC × $100,000 = $100,000
- Loan balance: $50,000
- LTV: $50,000 / $100,000 = 50%
Now BTC drops 30% to $70,000. Your loan balance is still ~$50,000 (interest may have accrued slightly, but ignore that for a moment).
- New collateral value: 1 BTC × $70,000 = $70,000
- Loan balance: $50,000
- New LTV: $50,000 / $70,000 = 71.4%
Your LTV jumped from 50% to 71.4% on a 30% price drop. Most lenders would now be sending you margin call notifications. Welcome to the volatility-of-LTV problem.
Worked example: ETH collateral with staking yield
The math is identical, but ETH has a wrinkle if you use a liquid staking token like stETH. We covered this in Ethereum-Backed Loans vs Bitcoin Loans. Briefly: if your stETH earns 3.5% staking yield, your collateral value grows over time, slowly improving your LTV even with no other action. Useful when prices are flat.
One catch — if stETH trades at a small discount to ETH (depeg), your effective LTV is computed against the discounted stETH price, not the ETH spot price. Plan a small buffer for that.
Worked example: USDC collateral
Stablecoins remove the volatility variable. If you pledge $100,000 of USDC and borrow $70,000:
- Collateral value: $100,000 (effectively constant)
- Loan balance: $70,000
- LTV: 70%
Most lenders will let you go to 80-90% LTV on stablecoin collateral because there is essentially no price-drop scenario. The trade-off is that the use case is narrower — you are usually using USDC collateral to borrow ETH or BTC for a different purpose, not to extract dollar liquidity.
The three LTV thresholds you must track
Every lender has three numbers, often disclosed in a single table on the loan documentation:
Initial LTV. The LTV at which you can open the loan. You choose this, within the lender’s limit. Most lenders cap initial LTV at 50% for BTC/ETH; some go to 65-70%. Lower initial LTV typically gets you a better rate.
Margin Call LTV. The threshold that triggers a “you have 24 hours to add collateral or repay” notification. Typical: 65-75% for BTC, lower for more volatile collateral. We unpack the mechanics in Margin Call vs Liquidation: The 24-Hour Window Explained.
Liquidation LTV. The threshold that triggers automatic forced liquidation, no warning, no opportunity to act. Typical: 80-85%. Above this LTV, the lender programmatically sells just enough collateral to bring you back to a safe LTV.
How much price drop you can absorb
Useful framework: at any LTV, calculate the maximum price drop before margin call.
If your initial LTV is X% and the margin call LTV is Y%, the max safe price drop is approximately:
Max drop = 1 – (X / Y)
So if you start at 50% LTV and margin call is at 70%:
Max drop = 1 – (50/70) = 28.6%
BTC can absolutely drop 28% in a week. Plan accordingly. We covered conservative LTV strategy in detail in Low LTV Crypto Loans: Safe Borrowing Guide and 20% LTV Crypto Loans: Safe Perpetual Credit Line.
A simple monitoring routine
Three habits that prevent surprise margin calls:
- Set a price alert. Calculate the BTC/ETH price at which you would hit margin call LTV, then set an alert at 5% above that. Most exchange apps and price-tracking tools support this.
- Check LTV weekly. Even without price alerts, a weekly five-minute LTV check catches creep from accrued interest and small price moves.
- Pre-stage backup collateral. Keep a small amount of additional BTC or stablecoins ready to add as collateral if needed. Speed matters more than the amount during a margin call window.
Frequently asked questions
What is a “safe” LTV for a crypto loan?
It depends on the volatility of the collateral. For BTC or ETH, most experienced borrowers keep LTV below 40 percent to leave a comfortable buffer for price drops. For stablecoin collateral (USDC, USDT), 70-80 percent is typically safe because there is minimal price movement.
Does the LTV calculation include accrued interest?
Yes. Outstanding loan balance for LTV purposes is the principal plus any accrued unpaid interest. As interest accrues, your LTV slowly creeps up even if the collateral price stays flat.
Can my LTV go above 100 percent?
Theoretically yes, if collateral drops faster than the lender can liquidate. In practice, lenders trigger forced liquidation well before that point, typically at 80-85 percent LTV.
Why do different lenders show different LTV for the same loan?
Some lenders use mid-market price; others use a specific exchange feed. Some include accrued interest in the calculation; others only show principal. Always check what price source and components your lender is using.
What is the difference between Initial LTV, Margin Call LTV, and Liquidation LTV?
Initial LTV is the LTV when you take the loan. Margin Call LTV is the threshold that triggers a notification requiring you to add collateral or repay. Liquidation LTV is the higher threshold that triggers automatic forced liquidation.
