Precise financial & developer calculators.

Monthly payment, amortization, extra-payment scenarios. Supports US, China, Russia, Indonesia.

Project retirement date with inflation, real returns, and Monte Carlo success rate.

Yield to maturity, clean/dirty price, Macaulay & modified duration, convexity.

Savings growth with contributions, variable compounding, inflation, and tax.

Personal, auto, student, or business loan. Refinance scenario comparison.

Interactive cash-flow builder for Internal Rate of Return and Modified Internal Rate of Return (MIRR), plus NPV, payback, and NPV profile chart.

Arithmetic mean, geometric mean (CAGR), time-weighted return, volatility, and Sharpe ratio — with per-period bar chart and growth curve.

Convert flat (add-on) interest to effective APR/EAR. Back-solve the real rate from your car loan, motorcycle, KTA, or credit instalment. Amortization chart.

What's Rp 1 million from 1990 worth today? Or $100 from 2000? Indonesia & US CPI data, 1990 → present.

Compare returns (1D–1Y) and rolling volatility for any stock, ETF, crypto, FX, commodity, or index. 21,000+ symbols.

Pick up to 5 tickers + a custom date range. All series rebased to 100% on the start date — end returns labeled on chart.

Backtest 10 classic strategies (SMA, EMA, RSI, MACD, Bollinger, Donchian, ATR) with parameter optimizer.

Faithful emulator of the legendary RPN financial calculator — TVM, NPV/IRR, AMORT, statistics. For users who know Reverse Polish Notation.

Algebraic or RPN entry, menu-driven TVM, cash-flow NPV/IRR, and bond price/YTM — the friendlier sibling of the HP 12C.

European & American option pricing for stocks, ETFs & indices. Full Greeks (Delta, Gamma, Vega, Theta, Rho, Vanna, Charm, Vomma) plus implied volatility.

Currency option pricing via Garman-Kohlhagen. Domestic + foreign rates, forward-rate parity, premium in pips and notional. 10 major pairs preset.

Cash-or-Nothing, Asset-or-Nothing, and Gap options — European digital payoffs with Greeks and live payoff diagram.

All 8 standard barrier types: knock-in and knock-out calls & puts with rebate, vanilla comparison, and barrier profile diagram.

Format, validate, and minify JSON with clear error positions. Offline & private.

Encode and decode Base64 text. UTF-8 safe, standard & URL-safe variants.

Convert between text and hexadecimal bytes. UTF-8 safe, multiple formats.

Percent-encode query strings, paths, and form data. Component / URI / form modes.

Generate UUID v4 or v7 in bulk. Cryptographically secure, time-ordered option.

Convert Unix epoch to human-readable dates. UTC, local, ISO 8601, relative.

Inspect JSON Web Token header and payload. Claim validation, client-side only.

Live match highlighting, capture groups, replace preview, common-pattern library.

Pretty-print or compress SQL across MySQL, PostgreSQL, T-SQL, SQLite, BigQuery, Oracle.

Translate cron into plain English and preview the next 10 fire times in your timezone.

Convert curl commands to JavaScript Fetch, Axios, or Node http snippets instantly.

Color picker with WCAG AA / AAA contrast ratios and APCA Lc score for accessible design.