About BTCETFCalc

What This Site Does

BTCETFCalc.com provides free, independent tools and educational content for Bitcoin ETF investors. Everything on the site is free to use with no account required.

The core tool is a calculator that converts ETF option strikes and premiums to Bitcoin price equivalents using live BTC-per-share ratios. If you hold IBIT calls at a $60 strike, the calculator tells you exactly what Bitcoin price that implies — instantly, using the current BlackRock ratio.

Beyond the calculator, the site provides historical price data with interactive charts, side-by-side ETF comparisons, per-ETF fact sheets, a performance calculator, a covered call calculator, and in-depth educational articles covering everything from tax treatment to custodial mechanics.

What Makes It Different

The site's unique feature is showing BTC-equivalent values alongside USD prices — something no other Bitcoin ETF resource currently offers.

When you look at an IBIT option strike price, the calculator instantly shows you what Bitcoin price that implies. When you compare ETF fees, the site shows you the cost in Bitcoin terms, not just percentages. When you check price history, you see both the ETF share price and the implied BTC value over time.

This BTC-denominated perspective cuts through the abstraction layer that ETF shares create between investors and the underlying asset. ETF shares are just fractional claims on Bitcoin — understanding the conversion ratio is the key to making informed decisions.

The calculator supports multiple ETFs including IBIT, FBTC, GBTC, ARKB, BITB, and BTC (Grayscale Mini) with live ratio data calibrated from official fund sources.

Data Sources & Methodology

  • Bitcoin price data: CoinGecko API (primary), Binance API (fallback)
  • ETF price data: Finnhub API
  • IBIT BTC-per-share ratio: derived from BlackRock iShares official holdings data
  • ARKB BTC-per-share ratio: parsed from ARK Invest's daily holdings CSV
  • Other ETF ratios: NAV-derived ratios calibrated daily from closing prices

All data is updated in real time during market hours. Each ETF displays its own ratio timestamp so users can verify data freshness.

BTCETFCalc is not affiliated with, sponsored by, or endorsed by BlackRock, Fidelity, Grayscale, ARK Invest, Bitwise, or any ETF issuer.

Editorial Approach

Educational content on the site is written to be balanced and factual, not promotional. Articles present tradeoffs honestly — including the limitations and costs of products discussed.

The site does not receive compensation from any ETF issuer, broker, or financial services company. No advertising is displayed on the site.

Content is regularly updated when fund data, fee structures, or market conditions change.

Technical Infrastructure

Built with Next.js and hosted on Cloudflare Pages for fast global delivery. Calculator computations happen client-side with live market data — no stale cached results.

The site is open to the public with no paywalls, registration walls, or content gating.

Contact

Feedback, corrections, and suggestions can be sent via the Send Feedback link in the site footer. Data errors are taken seriously and corrected promptly.