The easiest way to build a smoothie recipe in grams is to set your blender jar on a kitchen scale, press tare, and add each ingredient until the display hits its number. A good starting blend is 1 medium banana (about 126 g), 1 cup of frozen blueberries (140 to 170 g) and 1 cup of milk (about 227 g). Write those numbers down once and every smoothie after that tastes the same.
| Ingredient | Usual amount | About this many grams |
|---|---|---|
| Banana | 1 medium | 126 g |
| Blueberries, fresh or frozen | 1 cup | 140 to 170 g |
| Strawberries, fresh, sliced | 1 cup | 167 g |
| Milk | 1 cup | 227 g |
| Yogurt | 1/2 cup | 113.5 g |
| Rolled oats | 1/4 cup | 22.3 g |
| Peanut butter | 2 tbsp | 33.8 g |
| Chia seeds | 1 tbsp | 9.3 g |
| Flax meal | 1 tbsp | 6.3 g |
| Honey | 1 tbsp | 21 g |
Why cups and smoothies don't get along
Frozen fruit is the main culprit. Chunky berries and mango cubes leave big air gaps in a measuring cup, so one cup can hold a lot of fruit or not much at all. King Arthur Baking lists a cup of blueberries at 140 to 170 g. That's a 30 g swing before you've added anything else.
Bananas vary too. The U.S. Food and Drug Administration uses 126 g for a medium banana, but the one on your counter might be a lot smaller or bigger. Weighing it tells you exactly what went in. Sticky things like peanut butter and honey are the other problem. Some of it stays stuck to the measuring spoon, so the amount in the blender ends up less than the recipe says.
How to write your smoothie recipe in grams
- Put the empty blender jar on the scale and press tare so it reads zero.
- Pour in the liquid first. Milk, juice or water at the bottom helps the blades spin.
- Press tare again, then add the yogurt or banana.
- Tare again and add the frozen fruit on top.
- Add the small extras, like oats, seeds or nut butter.
- Write every number on a sticky note or in your phone. Next time, just repeat it.
Pressing tare between ingredients means you never have to do math. Each ingredient starts from zero, so you're only watching for one number at a time. Once a smoothie tastes right, those numbers become your house recipe.
Weighing the small extras
The little stuff is where smoothies drift the most. A tablespoon of chia seeds is about 9.3 g and a tablespoon of flax meal is about 6.3 g, based on the King Arthur Baking chart. Amounts that small can be hard to read on a big kitchen scale, especially with a heavy blender jar already sitting on it.
Nut butter is the classic example. Two tablespoons of peanut butter come to about 33.8 g. If you spoon it straight into the jar on the scale, you get exactly that, and the bit stuck to your spoon doesn't count against you, because the scale only reads what lands in the jar. Honey works the same way at about 21 g per tablespoon.
If you add protein powder or another supplement, use the gram serving printed on your own product label, not a guess based on the scoop. Our guide on measuring protein powder walks through that step by step.
Common mistakes
- Weighing fruit before you trim it. Peel, pit and stem first, then weigh what actually goes in.
- Forgetting to tare. If the display still includes the jar, every number after that is off.
- Overloading a small scale. Glass blender jars are heavy. Check your scale's maximum before you pile ingredients on top.
- Changing two things at once. If a smoothie comes out too thick, adjust only the liquid next time so you know what fixed it.
A practical tip: weigh the big ingredients in the jar on a kitchen scale, and handle the small extras with a MeasureMate digital measuring spoon. It scoops and weighs in one step, reads in 0.1 g steps, and the tare button zeroes the reading so you can add chia and then flax without dumping anything out. It weighs up to 500 g, which covers seeds, oats and nut butter easily.
Quick questions
How many grams is a cup of frozen fruit?
It depends on the fruit and the size of the pieces. King Arthur Baking puts a cup of blueberries at 140 to 170 g, so weighing is the only way to know for sure.
Should I weigh fruit frozen or thawed?
Weigh it the way you'll blend it. If it goes in frozen, weigh it frozen and you'll get the same result every time.
Can I weigh ingredients right in the blender jar?
Yes, as long as the jar plus ingredients stays under your scale's maximum. Press tare with the empty jar on top and build from there.
Weights based on the King Arthur Baking ingredient weight chart and the FDA raw fruits nutrition poster.