Bridge Fee Comparison Calculator
Compare cross-chain bridge costs including percentage fees, fixed fees, and gas on both chains. Calculate the true cost of moving assets between blockchains.
About this calculator
This calculator adds up the four cost components of moving an asset across a cross-chain bridge: a percentage fee (Bridge Fee, taken as a share of Transfer Amount), a flat Bridge Fixed Fee charged regardless of size, and gas costs on both the source and destination chains. Total Bridge Fee is simply the sum of all four, and Net Amount Received is Transfer Amount minus that total, floored at zero so the figure never goes negative even if fees somehow exceeded the transfer. Effective Fee Rate expresses Total Bridge Fee as a percentage of Transfer Amount, which is the number most useful for comparing bridges across different transfer sizes -- a bridge with a low percentage fee but a high fixed fee looks cheap on large transfers and expensive on small ones, and Effective Fee Rate captures that trade-off in one figure.
Because Bridge Fixed Fee and the two gas cost inputs don't scale with transfer size, Effective Fee Rate falls as Transfer Amount grows even with every other input held constant -- the fixed costs get diluted across a larger transfer. This is a straightforward fee-addition model, not a live bridge-routing quote: it does not account for bridge liquidity depth, price slippage on the receiving side, or how gas prices fluctuate with network congestion, all of which affect what a real bridge transaction actually costs at the moment you submit it.
Financial Disclaimer
This calculator is for educational purposes only and does not constitute financial advice. Results are estimates based on the inputs provided. Consult a qualified financial advisor before making investment or financial planning decisions.
Total Bridge Fee
$17.50
Net Amount Received
$9,982.50
Inputs
Comparison
Percentage Fee
$10.00
Fee based on transfer amount.
Fixed Fee
$2.00
Flat fee charged by the bridge.
Gas Costs (Both Chains)
$5.50
Combined gas fees on source and destination.
Effective Fee Rate
0.17%
Total fees as a percentage of transfer amount.
How to Use This Calculator
- Enter the Transfer Amount you want to bridge across chains.
- Input Source Chain Gas Fee and Destination Chain Gas Fee for the two networks involved.
- Set the Bridge Fee (percentage) and Bridge Fixed Fee charged by the bridge protocol.
- Review Total Bridge Fee and Effective Fee Rate to see the true cost as a percentage of your transfer.
- Compare Net Amount Received across different bridge fee structures to find the cheapest option for your transfer size.
How the result changes with Transfer Amount
| Transfer Amount | Total Bridge Fee | Net Amount Received |
|---|---|---|
| $5,000.00 | $12.50 | $4,987.50 |
| $7,500.00 | $15.00 | $7,485.00 |
| $15,000.00 | $22.50 | $14,977.50 |
| $25,000.00 | $32.50 | $24,967.50 |
What each input means
- Transfer Amount
- Amount you want to bridge across chains.
- Source Chain Gas Fee
- Gas cost on the originating blockchain.
- Destination Chain Gas Fee
- Gas cost on the receiving blockchain.
- Bridge Fee
- Percentage fee charged by the bridge protocol.
- Bridge Fixed Fee
- Fixed fee charged regardless of transfer amount.
What each result means
- Total Bridge Fee
- Total cost to bridge including all fees.
- Percentage Fee
- Fee based on transfer amount.
- Fixed Fee
- Flat fee charged by the bridge.
- Gas Costs (Both Chains)
- Combined gas fees on source and destination.
- Net Amount Received
- Amount you actually receive after all fees.
- Effective Fee Rate
- Total fees as a percentage of transfer amount.
How this is calculated
Worked example, using the default values
- Identify Input Parameters5 parametersTransfer Amount = 10000, Source Chain Gas Fee = 5, Destination Chain Gas Fee = 0.5, Bridge Fee = 0.1, Bridge Fixed Fee = 2 = 5 input(s) provided
- Calculate Total Bridge FeeTotal Bridge Fee17.5 = $17.5
- Calculate Net Amount ReceivedNet Amount Received9982.5 = $9,982.5
- Calculate Percentage FeePercentage Fee10 = $10
- Calculate Fixed FeeFixed Fee2 = $2
Engine last updated . Checked against 2 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Why does Effective Fee Rate drop for larger transfers even with the same fee settings?
Bridge Fixed Fee, Source Chain Gas Fee, and Destination Chain Gas Fee are all flat dollar amounts that don't scale with Transfer Amount, so they make up a smaller percentage of a large transfer than a small one. Bridge Fee (the percentage component) stays constant as a share of Transfer Amount regardless of size, so it's specifically the fixed-cost components getting diluted across a bigger transfer that pulls Effective Fee Rate down.
What's the difference between Bridge Fee and Bridge Fixed Fee?
Bridge Fee is a percentage of Transfer Amount -- it scales up with the size of what you're moving. Bridge Fixed Fee is a flat dollar charge that stays the same no matter how much you transfer. Many real bridges use one or the other, or a small amount of both; this calculator lets you combine them to model whichever fee structure your chosen bridge actually charges.
Does this calculator account for slippage or bridge liquidity?
No -- Total Bridge Fee only sums the percentage fee, fixed fee, and gas costs you enter. It does not model price slippage from thin bridge liquidity or gas price volatility from network congestion, both of which can add real, variable cost to an actual bridge transaction beyond what this fee-addition model captures.
Can Net Amount Received ever be negative?
No -- Net Amount Received is floored at $0, so even in a scenario where Total Bridge Fee exceeds Transfer Amount, this calculator reports $0 received rather than a negative figure. A near-zero or zero Net Amount Received signals that fees are consuming most or all of the value being transferred, which is a sign the transfer size may be too small for the fee structure you've entered.
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