Calculators that show their working
Each calculator runs in your browser, explains its formula, and includes a worked example you can check by hand.
DCA calculator
Dollar-cost averaging means buying the same dollar amount on a schedule. This calculator shows what that does to your average cost, using prices you enter.
Position size calculator
Decide how much you are willing to lose first, then let the arithmetic tell you how big the position can be. This calculator shows the formula and its limits.
Crypto profit calculator
Several buys at different prices make it hard to know where you stand. Enter each purchase and the current price to see your average cost, gain or loss, and break-even price with fees included.
Satoshi converter
A satoshi is the smallest unit of bitcoin recorded on the blockchain. Convert any amount between BTC, satoshis and dollars, with the arithmetic shown.
Drawdown recovery calculator
A 50% fall needs a 100% gain to recover. This calculator shows the uncomfortable arithmetic for any drawdown, with the formula and a worked example.
How these calculators work
Each calculator runs entirely in your browser: nothing you type is sent to us or stored. The formulas are written out on each page, followed by a worked example computed in code so you can check the calculator by hand.
These are arithmetic tools. They do not know about taxes, slippage beyond the fee you enter, or the future, and none of their outputs is a recommendation.