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In spite of its cultural pervasiveness as a primary unit of measuring liquor, there is no common measurement for how much a shot definitely contains. Because of this, measuring a shot of whiskey is dependent on the whim of the person pouring the drink. Despite that there is no set standard for pouring a shot of whiskey, you can still get an exact measurement on how much whiskey your own personal shot glasses will hold.
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Pour the whiskey into a standard shot glass.
Measure the amount of liquid by pouring the whiskey out of the shot glass into a measuring cup. Most shot glasses contain approximately 1 1/2 oz.
Repeat this process with any other shot glasses you may have, including double shot glasses.