Bitcoin validators, APY/APR, DCA, staking rewards, seed phrase & portfolio calculators — DeFi made simple.
Ethereum Address Validator
Validate ETH addresses with full EIP-55 checksum verification — 100% in your browser.
APY ↔ APR Converter
Convert Annual Percentage Rate to Annual Percentage Yield and back — DeFi-grade precision.
DCA Calculator
Simulate dollar-cost averaging into any asset — see total invested, units held, and average cost.
Satoshi ↔ BTC Converter
Convert satoshis to bitcoin and back with millisecond precision — the sats standard.
ETH Unit Converter
Convert between Wei, Gwei, Finney and Ether — gas, balances and DeFi in one place.
Bitcoin Address Validator
Validate BTC addresses — Legacy (P2PKH), SegWit (P2SH), and Bech32 (Native SegWit + Taproot).
Staking Rewards Calculator
Project staking yield over time — daily, weekly, monthly compounding with restake modeling.
Crypto Tax Calculator
Compute capital gains P&L on crypto trades — FIFO, LIFO and HIFO methods.
Portfolio Rebalancer
Compute exact buys and sells to reach your target asset allocation.
Crypto Payment QR Generator
Generate a payment QR for BTC, ETH, SOL, LTC — copy-paste into any wallet.
Crypto Denomination Reference
Lookup table for BTC, ETH, SOL units — sats, gwei, lamports and more.
BIP39 Seed Phrase Validator
Check recovery phrases word-by-word against the BIP39 wordlist and verify the checksum.
Stock Profit Calculator
Compute profit, ROI and break-even on any stock trade — including commissions.
Dividend Yield Calculator
Compute dividend yield, annual income and DRIP projections for any holding.
Investment Growth Calculator
Project future value with regular contributions, growth rate, and compounding.
Cap Table Calculator
Build a capitalization table with founders, investors and an option pool.
Startup Equity Calculator
Estimate the value of your employee stock options after dilution and exit.
Company Valuation Calculator
Estimate business value with revenue multiples, DCF and earnings multiples.