Finance

Currency codes, account validators and finance calculators.

29 tools

Bitcoin Address Validator Validate the checksum of a Bitcoin address (Base58Check / Bech32 / Bech32m).
Bond Pricing / Yield Calculator Price a bond from yield, or approximate yield from price.
Cap Rate / Real Estate ROI Compute NOI, cap rate and cash-on-cash return for a rental property.
Capital Gains Tax Estimator Approximate US federal capital gains tax (long vs short term).
Credit Card Type Identifier Identify the payment brand from a card number's IIN and run the Luhn check.
Crypto Vanity Address Estimator Expected work for a vanity prefix on a Bitcoin (base58) or Ethereum (hex) address.
Dividend Reinvestment (DRIP) Project share count and value when reinvesting dividends.
Ethereum Address Checksum (EIP-55) Validate or apply the EIP-55 mixed-case checksum for any Ethereum address.
FIRE / Retirement Calculator Project years to financial independence at a given savings rate.
IBAN Validator Validate an IBAN's country length and ISO 13616 mod-97 checksum.
ISO 4217 Currency Code Reference Search the active ISO 4217 currency codes, numbers and minor units.
Lease vs Buy Calculator Compare leasing to financing a car (or similar) over the term.
Margin / Markup / Break-Even Calculator Solve margin, markup and break-even for any pricing or business model.
Mortgage Recast Calculator After a lump-sum prepayment, find the new monthly payment under a recast.
Mortgage Refinance Break-even Find the months-to-break-even after a refinance and total lifetime savings.
Pricing Tier Builder Design a 2-5 column SaaS pricing comparison and export as HTML, JSON or Markdown.
ROI / Payback Period Calculator Compute simple ROI, annualised ROI and payback period.
Rule of 72 Calculator Estimate how long it takes for an investment to double (72 / rate).
SaaS Metrics Calculator Compute MRR, ARR, NRR, GRR, LTV, CAC, Quick Ratio, Magic Number and Rule of 40.
Sales Tax / Markup / Margin Calculator Calculate sales tax, markup vs margin and retail pricing in one place.
Sharpe Ratio Calculator Compute the Sharpe ratio from a series of periodic returns.
Simple vs Compound Interest Comparator Side-by-side: simple, compounded and continuously-compounded growth.
Sortino Ratio Calculator Risk-adjusted return that penalises only downside volatility.
Stock Dollar-Cost Averaging Calculator Simulate periodic equal-dollar buys across a price series.
Stock Lot Cost Basis Calculator Compute cost basis on a sale using FIFO, LIFO or average-cost methods.
Stock Options Vesting Visualizer Project a monthly or quarterly stock-option vesting schedule with paper-gain math.
Stock Split Adjuster Back-adjust a price series for a forward or reverse stock split.
Tax Bracket Calculator Estimate US federal income tax on a single-filer 2025 bracket schedule.
US ABA Routing Number Validator Validate a US bank routing number's checksum and identify the Federal Reserve region.