Crypto & Blockchain Tools

Crypto calculators and blockchain utilities: DCA, staking, liquidation price, mining profitability, BIP39 and HD wallet generators, address validation, Keccak selectors, Merkle trees and transaction decoding.

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Bitcoin DCA Calculator

Enter your purchases as amount, price to see total spent, BTC accumulated, and average buy price. The tool runs locally in your browser.

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Crypto Staking Rewards Calculator

Crypto staking calculator: enter amount, APR, period, and compounding to see total rewards and effective APY. Results are estimates.

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Impermanent Loss Calculator

This impermanent loss calculator shows how a token price change affects pool value vs HODL. Check impermanent loss and the dollar difference.

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Liquidation Price Calculator

Liquidation price calculator estimates liquidation levels for long and short positions: entry price, leverage, maintenance margin, distance, initial margin.

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Position Size Calculator (Risk Management)

Free position size calculator: enter capital, risk, entry price and stop-loss to get position size, position value and required leverage.

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Mining Profitability Calculator

Check if BTC mining pays off. Enter hashrate, power draw, and electricity price to see daily revenue, electricity cost, and profit in seconds.

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Hashrate Converter (H/s, TH/s)

Hashrate converter for H/s, kH/s, MH/s, GH/s, TH/s, PH/s and EH/s. Enter a value, choose a unit, and see the result in every other unit instantly.

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Gwei to ETH and Wei Converter

Use this Gwei to ETH converter to calculate transaction cost in ETH and dollars plus the value in wei. Runs locally in your browser.

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Satoshi to BTC and USD Converter

Convert Satoshis to USD and BTC: enter the number of Satoshis and a BTC price in USD to see the BTC and dollar value instantly, no account needed.

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Ethereum Function Selector (EVM)

Enter an Ethereum function signature with parameter names to quickly get its canonical form, full Keccak-256 hash, and 4-byte selector.

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ENS Namehash Calculator

ENS namehash calculator following EIP-137. Enter an ENS name to get the namehash and first-label labelhash. Computed locally in your browser.

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EIP-712 Hash Calculator

Enter the name, version, Chain ID, and contract address, and the calculator computes the EIP712Domain type hash and domain separator locally in your browser.

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Bitcoin and Ethereum Address Validator

Validate Bitcoin and Ethereum addresses in your browser. Check Base58Check, Bech32, Bech32m, and EIP-55 checksums instantly. No address is sent anywhere.

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Merkle Tree Calculator

Merkle tree calculator in your browser: enter leaves, choose SHA-256 or double SHA-256, and see the Merkle root plus hashes for every level.

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Shamir Secret Sharing

Split a password or text into n shares with threshold k using Shamir's Secret Sharing. Recover the secret from any k shares. All math runs locally.

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ECDSA Message Signer

Sign an ECDSA P-256 message and verify the signature with a public key. All calculations run locally in your browser; no data is sent.

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EVM Bytecode Disassembler

EVM bytecode disassembler online turns contract hex into a readable instruction list. See opcodes, PUSH arguments, PC positions, and unknown bytes.

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Ethereum Transaction Decoder

Ethereum Transaction Decoder shows type, Chain ID, nonce, gas price, gas limit, recipient, amount, data, and signature v, r, s. Paste hex and read the fields.

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Elliptic Curve Visualizer

Elliptic curve visualizer: set a, b, and prime p up to 199, click Draw, see all points on the plot, and check point addition P + Q.

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BIP39 Seed Phrase Generator

Free BIP39 seed phrase generator: choose 12, 15, 18, 21, or 24 words, check the checksum, and reveal the 512-bit seed. Educational tool.

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HD Wallet Address Generator (BIP32/44/49/84)

Generate HD wallet addresses and keys from a BIP39 phrase for Bitcoin or Ethereum. Choose BIP44, BIP49, BIP84, or EVM, set account and address count.

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Ethereum Vanity Address Generator

Ethereum vanity address generator: create an address and private key locally in your browser. Set a prefix or suffix and check attempts.

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Crypto FIFO Profit Calculator

Free crypto FIFO calculator: enter buys and sells to compute profit or loss per sale, FIFO cost basis, total result, and your remaining portfolio.

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