RSO Edible Ratio Guide: How Much Oil Per Batch

Here’s the thing about RSO edibles. Almost every story we hear at the counter about someone having a bad night with a homemade brownie comes down to the same mistake. They used a whole syringe because a video said to, and never did the math on what that meant per bite.

So let’s do the RSO edible ratio math. It takes two minutes and it changes everything.

The only number that matters

Every syringe we sell has a lab result on it. Find the total THC percentage. Say it reads 70%. A one gram syringe at 70% holds roughly 700 mg of THC. That’s the whole batch budget, and everything else flows from it.

If your syringe reads 62%, you’ve got about 620 mg. If it’s a 0.5 g syringe at 80%, you’ve got 400 mg. Same idea every time: grams times percentage times 1,000.

Write that number on a sticky note. Put it on the fridge. You’ll want it later.

Decide the serving before you decide the recipe

Most people go at this backward. They pick a recipe, dump the oil in, and only afterward wonder how strong each piece turned out. Flip it.

Start with what one serving should be. For someone new to edibles, 5 mg is a reasonable first serving and 10 mg is on the firmer side. Regular patients often sit anywhere from 10 to 25 mg. If you have no idea, go lower than you think. You can always eat two.

Now divide. 700 mg in the syringe, 10 mg per serving, that’s 70 servings. Nobody is cutting a brownie pan into 70 pieces, which is exactly the point. A whole gram is too much for one pan of anything.

The ratio table we hand out

Here’s the rough guide we keep by the register. It assumes a 70% syringe, so scale it if yours is different.

Serving you want	Pieces in the batch	RSO to use
5 mg	16	about 0.11 g (80 mg)
10 mg	16	about 0.23 g (160 mg)
10 mg	24	about 0.34 g (240 mg)
20 mg	16	about 0.46 g (320 mg)
25 mg	12	about 0.43 g (300 mg)

Our syringes have markings on the side, usually in tenths of a gram. Push out to the line and you’re close enough. Nobody needs a lab scale for this.

Getting it evenly through the batch

This is where most homemade batches go wrong, and it’s not the ratio. RSO is thick and sticky and it wants to sit in one corner of the bowl. If it does, one brownie ends up with the whole dose and the rest are decorative.

Warm the syringe first. Ten minutes in a cup of warm tap water is plenty. Then push the oil into whatever fat the recipe calls for, melted butter or coconut oil, and stir until you cannot see any dark streaks. Only then does that fat go into the batter. Mix the batter longer than you normally would.

Some folks add a splash of lecithin to help it bind. Not required, but it doesn’t hurt.

Keep the oven honest

RSO is already activated. The extraction process decarboxylates it, so there’s no step where you need to “turn it on.” Heat past that point only works against you.

Bake under 300°F when you can. If the recipe demands 350°F, it will still work, you’ll just lose some strength and the math gets fuzzier. No-bake recipes sidestep the whole issue, which is why so many patients end up making gummies, nut butter cups, or just stirring RSO into warm coffee with a pat of butter.

The test bite

Make the batch, cut it, then eat one piece and set a timer for two hours. Not one hour. Two. Edibles come on slowly and people who redose at the 60-minute mark are the ones who call us the next morning.

If the piece felt right, you’ve got your ratio. Write it on the sticky note next to the syringe number. Next time you can skip the guesswork.

If it felt like too much, halve the serving next batch or cut the pieces smaller. If it felt like nothing, wait a day and try one and a half. Small moves.

A word on storage

Whatever you make, label it and keep it away from anyone who shouldn’t have it. Kids, roommates, the dog. A container in the back of the freezer, clearly marked, is the easy answer. RSO edibles hold their strength for months frozen and a few weeks in the fridge.

If you want to talk through a specific recipe, bring it in. We’ve probably heard a version of it before and can tell you where it usually goes sideways.

This is general information from people who sell and use these products, not medical advice. If you take other medications or have a health condition, talk to your doctor before adding cannabis. Keep every product away from children and pets.