NFT Royalty Calculator

A creator royalty is a percentage of every secondary-market sale price that flows back to the original minter of an NFT rather than to the seller. The arithmetic is deliberately simple: royalty per sale equals sale price multiplied by the royalty rate, so a 2.5 ETH sale at 5 percent yields 0.125 ETH. Aggregate income is then a volume problem, not a price problem - monthly royalties equal collection size multiplied by the monthly secondary turnover rate multiplied by the royalty per sale. Turnover is the variable most people misjudge. A 10,000-piece collection with a 5 percent monthly sale rate produces roughly 500 trades per month; blue-chip collections in quiet markets often turn over 1 to 3 percent, while a collection during a hype cycle can exceed 20 percent for a few weeks before collapsing. Royalty rates cluster between 2.5 and 10 percent, with 5 percent the most common default and 2.5 percent typical of high-volume collections such as Bored Ape Yacht Club. The marketplace fee, historically 2.5 percent on OpenSea, is a separate deduction that comes out of the seller proceeds, not the creator share, so the seller of a 2.5 ETH item at 5 percent royalty and 2.5 percent platform fee nets about 2.3125 ETH. The large caveat is that royalties are a social and marketplace convention rather than a protocol guarantee. EIP-2981 only exposes a read-only royaltyInfo function telling a marketplace what to pay; nothing in the ERC-721 transfer path enforces it. Wallet-to-wallet transfers, OTC deals, and royalty-optional venues bypass payment entirely, so projected income should be treated as an upper bound.

Resale royalties predate blockchains by nearly a century. France introduced the droit de suite in 1920, giving visual artists a share of subsequent sales of their work, and the concept spread through European copyright law and the 2001 EU Resale Right Directive. NFTs revived the idea in an automated form: when Larva Labs, Dapper Labs, and the early Ethereum art platforms built marketplaces between 2017 and 2019, contracts such as those behind CryptoKitties and the SuperRare and Foundation platforms began paying creators a fixed cut of each resale directly in the settlement transaction, something the analogue art market had never managed to collect reliably. Standardisation came with EIP-2981, proposed by Zach Burks and collaborators in September 2020 and finalised as an Ethereum standard, which defined a common royaltyInfo interface so any marketplace could query the intended recipient and amount. Enforcement, however, was never part of the standard, and the gap became a public dispute in 2022. OpenSea launched its Operator Filter Registry in November 2022 to block trading venues that ignored royalties, while Sudoswap and then Blur competed for volume by making royalties optional or minimal. Blur later required a 0.5 percent minimum. Limit Break responded in 2022 and 2023 with ERC-721C, which adds transfer-level programmable enforcement. By 2023 OpenSea itself moved to optional creator earnings on most collections, leaving royalty income dependent on marketplace policy rather than code.