Polkadot Staking Calculator

Polkadot pays staking rewards from new issuance on a daily cycle called an era. Inflation is not a flat number: the protocol targets an ideal fraction of total supply being staked, and the reward rate is highest when actual staked supply sits at that target. If less DOT is bonded than the target, per-DOT rewards rise to attract more stake; if more is bonded, the excess issuance is redirected to the treasury instead of to nominators, so yields fall. This is why headline rates near 14 percent APR coexist with far lower real returns once the staking ratio and validator commission are accounted for. A nominator effective rate is the gross era rate multiplied by one minus the validator commission, compounded at whatever frequency the rewards are actually claimed and re-bonded. Three operational constraints shape the result. Unbonding takes 28 days during which the DOT earns nothing and cannot move, so the effective yield on capital that may be needed sooner is lower than the quoted figure. Era payouts expire after 84 eras if never claimed, returning to the treasury. And nomination is competitive: only a bounded active validator set receives rewards each era, and within a validator only the highest-backing nominators are paid, which is why direct nomination has historically required hundreds of DOT while nomination pools accept far less. Slashing is graded, from fractions of a percent for isolated unresponsiveness up to total loss for coordinated equivocation, so spreading nominations across independent operators is the standard mitigation.

Polkadot was described in a 2016 whitepaper by Gavin Wood, who had previously written the Ethereum Yellow Paper, and was built by Parity Technologies with research funded through the Web3 Foundation. Its consensus is Nominated Proof of Stake, a design in which token holders do not vote directly for blocks but nominate a slate of validators, and an election algorithm then picks an active set and distributes backing stake as evenly as possible across it. That election problem is solved with a sequential variant of a proportional method first described by the Swedish mathematician Edvard Phragmen in the 1890s for parliamentary seat allocation, adapted to stake weights by Web3 Foundation researchers. The relay chain launched on 26 May 2020 in a limited proof-of-authority mode, with validator elections and nominator rewards switched on the following month and the chain handed to on-chain governance shortly after. In August 2020 DOT was redenominated by a factor of one hundred, so historical reward figures published before that date are not directly comparable with current ones. The nomination minimum drifted upward as the network grew, pricing out smaller holders, and nomination pools were introduced in late 2022 to restore access by aggregating small balances into a single nominating entity. Inflation and the ideal staking rate have since been revisited through governance, making the reward rate a parameter of political process rather than a fixed constant.