Have you tried edibles before ? The high is very different than that of smoking as it takes a long time to take effect and then it builds and builds. If you dose too high then it can be a horrible feeling that lasts for hours and can be very intense.
The best way to do this would be make a batch of either butter or milk and remember how many 'bowls' you used - then dose by the bowl full to gauge its effect. After that it's just a case of increasing your initial dose to get you where you want to be. (if you use say 10 bowls full into half stick of butter, that butter has 10 bowls so divide it up accordingly - half contains 5, half that contains 2.5 etc)
Remember that it can take several hours before it starts to work so don't be tempted to dose again. If your initial attempt fails double up next time.
Just found this which may be helpful -
First, identify the percentage of THC in the strain you’re cooking with. Catalano says on average, most strains have about 10 percent THC. Strains that have 15-20 percent THC are above average, and those with 21 percent THC or higher are exceptionally strong. If you can’t find online plant breeding information or cannabinoid lab tests for the strain, estimate at 10 percent THC.
You are starting out with a quarter ounce of marijuana, that’s 7 grams. An eighth would be 3.5 grams.
Every 1 gram of cannabis bud has 1,000mg of dry weight. If a strain has about 10% THC, ten percent of 1,000mg would be 100mg. So for cooking or baking at home, it is safe to assume that a gram of cannabis contains at least 100mg THC.
Using Catalano’s dosing measurement formula, you do the math accordingly to find out how much THC per serving. Take the amount of ground marijuana, convert it to milligrams and divide it by the recipe yield to determine a per-serving dose of THC. A starting dosage for beginners is 5 milligrams per serving (the Colorado-mandated serving size for marijuana-infused edibles is 10mg THC). Three grams of ground marijuana equals 300mg THC. 300mg divided by the recipe yield, (a classic cookie recipe makes 60 cookies) equals 5mg per cookie. If you want to be even more cautious with your at-home cannabutter cooking, 1.5 grams (150mg) marijuana divided into a 60-cookie recipe will yield 2.5mg a serving.