Tools
Small utilities that answer one question well.
21 million, shared out
If every bitcoin were split equally between everyone on Earth, how many sats would each person get? Try it with the cap, the coins issued so far, and lost coins removed.
Address checker
Paste an address before you send. See its type and network, catch typos with its checksum, and check every character against the original. Reads every bitcoin address format, payment links and Lightning invoices.
@bh: At Block Height
Tell time the Bitcoin way. Turn any date into a block height and any block height into a date, in your own time zone. A tool by @anikmalcolm, shown here live.
Download checker
Before you install a wallet or node, check the file against the SHA-256 hash its developers published. Runs in your browser; the file is never uploaded.
Halving countdown
A live countdown to the next halving, ticking every second from the latest block and the recent block time, with the full subsidy schedule. When the halving block is mined, the site celebrates.
Home mining calculator
What a home miner earns in a pool, what its power costs, the break-even electricity price, and the real odds of finding a block alone.
Inheritance letter template
Shape a plain letter template that tells your family what bitcoin exists, where things are kept and who can help, using placeholders only. Download it, fill in the real details offline, then print.
Multisig planner
Pick m-of-n and see how many keys you can lose, how many a thief needs, and what each setup costs to spend.
On this day in Bitcoin history
Pick any day of the year and see what happened in Bitcoin's history on it, from BTCalendar's timeline.
Price in hours of work
What does it cost in hours of your life? See any price in hours of work at the average US wage, from 1900 to now, and what an hour of work buys in sats.
Proof of work, by hand
Mine a toy block on your own phone or computer, then see how your device compares with the whole Bitcoin network right now.
Sats, BTC and dollar converter
Convert between satoshis, bitcoin and US dollars at the latest price, or at any price you type.
Stuck transaction rescuer
A payment sitting unconfirmed? Work out the fee to replace it (RBF) or to pull it through with a child transaction (CPFP), at today's rates.
Transaction fee calculator
Work out a transaction's size in vbytes and its fee, from the address types you spend and send to, at the latest fee rates.
Who holds your bitcoin?
Split what you hold into coins you control with your own keys and promises from someone else, and see what each one depends on.
Withdrawal size planner
Small coins cost the same to spend as big ones. See what each withdrawal will cost to move later, and the smallest size worth sending to cold storage.
DCA calculator
See what regular buys of any size would have done over any period in bitcoin's history.
Drawdown recovery calculator
How big a gain it takes to get back to even after a fall, and how long past recoveries took.
Future value projector
Enter your own growth assumption and see what a stack could be worth. A what-if, not a forecast.
Lump sum vs. DCA
Compare investing everything on day one with spreading the same money over time, across every historical start date.