The Bitcoin block mining reward halves every 210,000 blocks. When it halves the mining reward will go from 12.5 BTC to 6.25 BTC per block. This is a simple count down timer that calculates the targeted halvening block height minus the current block height multiplied by the Bitcoin 10 minute block time interval (X - Y) * 10 * 60. This is an estimate and won't be 100% accurate since not all Bitcoin blocks are found exactly in 10 minute intervals due to the time in between difficulty adjustments as explained here Want to know more about Bitcoin? Read the Bitcoin FAQ to learn more.

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