Arbitrage Percentage Calculator
The same asset trades at two different prices, and the only question that matters first is: how big is the gap, in percent? This arbitrage percentage calculator takes the lower market price and the higher market price and returns the gross arbitrage spread: (higher minus lower) divided by lower, times 100. It is deliberately a gross figure, before fees, slippage or transfer costs, because its job is screening. If the gross spread cannot survive your costs, no further math is worth doing.
A quick example of the scale: Bitcoin at $27,500 on one exchange and $28,050 on another is a 2.00% gross spread. That sounds comfortable until you remember that two 0.5% trading fees consume half of it. This page shows you how to read the percentage against real cost levels, and if you arrived here looking for the sports-betting meaning of arbitrage percentage, that formula is worked in full further down as well.
Gross spread only: trading fees, transfer costs, slippage and price movement between the two legs are not included. Run the net-profit check before treating any spread as money.
Quick Answer
Key takeaways
- Arbitrage percentage here means gross price spread: (higher minus lower) divided by lower, times 100. Fees are not in this number.
- Read the result against your round-trip costs. Under 0.5% rarely survives normal fees; 2% or more is worth a full net-profit check.
- A negative result means there is no spread in that direction. The venues are the wrong way round, or the gap has already closed.
- Sports bettors use the same phrase for a different formula based on implied probability. That version is worked in full below.
- Quick Answer
- What this percentage is, and what it is not
- The arbitrage percentage formula
- Worked example: Bitcoin quoted $550 apart on two exchanges
- Reading the result: the spread has to beat your round-trip costs
- Here for sports betting arbitrage instead?
- The honest limitations: why a real spread is rarely risk-free
- What this calculator covers, and why each part matters
- Frequently asked questions
- Add This Calculator to Your Website
- References
What this percentage is, and what it is not
The arbitrage percentage on this page is a screening number. It tells you the size of a price gap as a proportion of the money you would put down, before a single cost is deducted. It is not a profit figure, a return guarantee, or a signal to trade. Its whole value is speed: two quotes become one comparable number, and spreads too small to survive your costs can be discarded in seconds.
The same percentage idea applies well beyond crypto: a stock quoted differently on two exchanges, a forex pair priced apart by two brokers, or a resale item listed at two prices. In each case the formula is the markup from the cheap venue to the expensive one, which is the same arithmetic as a percentage profit calculator applied to a buy and a sell that happen in two places instead of two moments.
The arbitrage percentage formula
Divide the price difference by the lower price, not the higher one. The denominator matters: the lower price is the capital you actually commit per unit, so the percentage is a return on money in, not a share of the selling price.
Worked example: Bitcoin quoted $550 apart on two exchanges
The calculator is pre-filled with this case, and the figures below are exactly what it returns.
| Figure | Value |
|---|---|
| Lower market price (buy here) | $27,500 |
| Higher market price (sell here) | $28,050 |
| Price difference per unit | $550.00 |
| Gross arbitrage percentage | 2.00% |
| Gross gain on $10,000 bought at the lower price | $200.00 |
| Verdict | Strong gross spread: worth a full cost check |
A smaller check on the same math: $95 to $100 is a $5 gap on a $95 base, which is 5.26%. Notice how a modest dollar gap becomes a large percentage when the base price is small. That is why percentages, not dollars, are the right screening unit: $5 of spread on a $95 asset and $550 on a $27,500 asset are completely different opportunities, and only the percentage shows it at a glance. If you screen many pairs, comparing percentages across trades is also where an average of percentages calculator helps you summarize a session honestly instead of cherry-picking the best print.
Reading the result: the spread has to beat your round-trip costs
A gross spread is only useful next to the costs it must survive. Trading fees are charged on both legs, and the table below shows approximately what is left of four gross spreads after round-trip fee totals of 0.2%, 0.5% and 1.0%, before slippage, spreads inside the order book, and transfer or withdrawal costs take their share.
| Gross spread | After 0.2% round-trip fees | After 0.5% round-trip fees | After 1.0% round-trip fees |
|---|---|---|---|
| 0.50% | 0.30% | 0.00% | -0.50% |
| 1.00% | 0.80% | 0.50% | 0.00% |
| 2.00% | 1.80% | 1.50% | 1.00% |
| 5.00% | 4.80% | 4.50% | 4.00% |
The pattern explains the verdict bands in the calculator. Below 0.5%, ordinary fees finish the trade before it starts. Between 1% and 2%, the answer depends entirely on your fee tier and how fast you can move the asset. At 2% and above, a spread is worth pricing properly. Pricing it properly means the full cost model: per-side fees, flat transfer costs, slippage and a timing-risk allowance, ending in a net dollar figure and a break-even sell price. That is exactly what the companion arbitrage profit calculator does, and it is the required next step before any spread on this page is treated as money.
Here for sports betting arbitrage instead?
Same phrase, different formula, and it is worth being direct about it: most pages ranking for "arbitrage percentage" mean the betting version. There, each set of decimal odds implies a probability: implied probability = 1 divided by the odds. Add the implied probabilities of the best odds for every outcome, taken from different bookmakers. If the total is under 100%, an arbitrage exists, and stakes split in proportion to each implied probability return the same amount whichever outcome wins.
Two-way worked example, tennis moneyline: Player A at 2.10 with one bookmaker (implied 47.62%) and Player B at 1.95 with another (implied 51.28%). The total is 98.90%, under 100, so this is an arbitrage on paper. On a $1,000 total stake, the split is stake = total times implied probability divided by total implied probability: $481.48 on Player A and $518.52 on Player B. Either result pays about $1,011.11, a profit of about $11.11, or 1.11% of the stake. For a three-way market, add the third outcome the same way: home 2.80 (35.71%), draw 3.80 (26.32%), away 3.10 (32.26%) totals 94.29%, also an arbitrage on paper, with the stake split three ways by the same rule.
This page's calculator does not run the odds version: it runs the trading version this URL has always run, the price-spread test. The stake split rule above is the bridge between the two: in trading, the equivalent of splitting stakes correctly is sizing both legs equally and pricing every cost, which is the profit calculator's job. One caution applies to both versions and every guide in this space repeats it: the betting version's 1.11% is a paper figure until both bets are actually placed at those odds.
The honest limitations: why a real spread is rarely risk-free
Arbitrage is usually described as risk-free, and in live markets that description does not survive contact with execution. Prices move between the moment you see a spread and the moment the second leg fills, and the gap can close or reverse in seconds on volatile assets. Transfers between venues take time, during which you hold an unhedged position. Venues protect themselves: exchanges can widen spreads or halt withdrawals, and bookmakers routinely limit or close accounts that only place arbitrage bets, sometimes after one side of a two-sided position has already been placed, leaving the other side exposed. Fees change, minimums and maximums bite at size, and a spread that looks wide on a screen may only exist for a quantity too small to matter. Treat the percentage on this page as the first filter in a cautious process, never as a promise, and never stake money you cannot afford to lose on the assumption that a paper spread will still be there when you arrive.
What this calculator covers, and why each part matters
This calculator tests a price spread between two venues and reads the result against the costs that spread has to survive, and it also works the sports-betting meaning of the same phrase in prose, clearly labeled, so both kinds of searcher leave with the right formula.
A verdict tied to real cost levels. The result is banded against what round-trip fees actually consume, so a 0.40% spread is called very thin on the spot instead of being left for the reader to misread as profit. The percentage itself is the gross spread, (sell minus buy) divided by buy, before fees, slippage, and transfer costs.
The handoff is built in. The percentage is step one of a two-step check. This page screens; the linked profit calculator prices the trade in dollars with fees, slippage, timing risk and a break-even level.
Both meanings, clearly labeled. This page keeps the trading calculator it has always run and works the sports formula in prose, with its own two-way and three-way examples, so both kinds of searcher leave with the right formula and a clear label on which is which.
Frequently asked questions
For two market prices it is (higher price minus lower price) divided by the lower price, times 100. Prices of $27,500 and $28,050 give (550 divided by 27,500) times 100, which is 2.00%. The result is the gross spread before fees, slippage and transfer costs.
It depends entirely on your costs. Under 0.5% is erased by normal trading fees on both legs. Between 1% and 2% can work for low-fee venues with fast transfers. At 2% or more a spread is worth a full net-profit calculation. There is no universally good number, only a number that beats your own round-trip costs with room to spare.
No. It returns the gross spread on purpose, as a screen. To see what remains after per-side fees, flat transfer costs, slippage and a timing-risk allowance, run the same prices through the arbitrage profit calculator, which works in net dollars and shows a break-even sell price.
Because the second price you entered is lower than the first, so there is no spread in that direction. Either the venues should be swapped (buy where it is cheap, sell where it is dear) or the gap has already closed. A negative result is the calculator telling you there is nothing to take.
It uses implied probability instead of prices. For each outcome, implied probability is 1 divided by the decimal odds. If the best odds for all outcomes, taken across bookmakers, sum to less than 100%, an arbitrage exists. Two-way example: 2.10 and 1.95 imply 47.62% and 51.28%, totaling 98.90%, which is an arbitrage on paper.
Triangular arbitrage cycles through three related prices, typically three currency pairs on one venue, to exploit an inconsistency in the cross rates. This calculator tests a single pair of prices for the same asset. The screening idea is the same, but a triangular check needs its own three-price calculation.
In theory, holding offsetting positions removes price risk. In practice, no: prices move between legs, transfers take time, venues limit accounts and widen spreads, and fees are certain while spreads are not. The limitations section on this page lists the main failure modes. Treat any calculated spread as an estimate until both legs have actually filled.
Usually fast. Other traders and bots watch the same gaps, and the act of trading against a spread closes it. Spreads on liquid crypto and stock pairs may last seconds; slower markets can keep a gap open longer, but those are often the markets where transfer and execution risk are highest.
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References
- Investopedia, "Arbitrage: What It Is and How It Works in Investing" - the definition of arbitrage, how price differences arise, and why they tend to be small and short-lived. Investopedia: Arbitrage. Accessed October 2026.
- Investopedia, "Bid-Ask Spread" - how the spread inside a single market quote works, and why quoted prices are not always executable prices. Investopedia: Bid-Ask Spread. Accessed October 2026.
- Investopedia, "Slippage" - the difference between an expected price and the price an order actually fills at, one of the main costs a gross spread must survive. Investopedia: Slippage. Accessed October 2026.
- US Securities and Exchange Commission, Investor.gov, "Understanding Fees" - how transaction fees and costs reduce investment returns. Investor.gov: Understanding Fees. Accessed October 2026.
- US Securities and Exchange Commission, Investor.gov, "The Fuss About Fees" - why small percentage fees matter more than they appear to. Investor.gov: The Fuss About Fees. Accessed October 2026.
- Tips.gg, "Arbitrage Betting Explained" - the sports-betting version of arbitrage percentage using implied probabilities, worked in the section above. Tips.gg: Arbitrage Betting Explained. Accessed October 2026.
- TopEndSports, "Arbitrage Betting: The Complete Guide" - the implied probability formula and stake split formulas for two-outcome betting markets. TopEndSports: Arbitrage Betting Guide. Accessed October 2026.
- MyBookie, "What is Arbitrage Betting and How it Works" - a worked betting example in which implied probabilities totaling 91.711% produce the stake split and profit figures. MyBookie: Arbitrage Betting Strategy Explained. Accessed October 2026.