Universal Masterblend Fertilizer Calculator

Masterblend Hydroponic Calculator

Ever tried mixing up a batch of hydroponic plant food and ended up with a powdery mess, only to realize you messed up your fertilizer ratios? Yeah, it happens. With the RecipeResize Masterblend Fertilizer Calculator, you can skip the guesswork and get your ratios right every time—no more chemistry disasters. It’s simple, it’s fast, and you don’t need a lab coat. Curious how you can whip up the perfect mix for your tomatoes or peppers? Well, you’re in for a treat...

How To Use This Calculator

If you’ve ever found yourself staring at a bag of fertilizer, a recipe, or really anything you need to adjust for size, you’ll love how easy RecipeResize.com makes things. First, just load up the website—no downloads, no headaches. Type in your list of ingredients, don’t worry about being fancy, just keep it clear. Next press the Lock button. Now, here’s the fun part: if you need to change the amount of, say, calcium nitrate because you’re almost out, just adjust that number. Boom, the rest of your ingredients update instantly, all keeping the same ratio. It’s like having a math whiz in your pocket, minus the pocket protector. And if you’re switching between metric and imperial, that’s a breeze too. No calculators needed! Pick any ingredient, adjust it, the rest update automatically. Go ahead and try it out for yourself with this calculator widget.

Is your hydroponic recipe different than the example? Head over to the main page and build your own recipe and save it as a personal preset. You can use it for more than just hydroponics.

Masterblend Tomato Classic Recipe 

Now that you've got the hang of the basic controls, let's talk about what actually goes into your Masterblend mix. The standard recipe calls for three key ingredients, not including water. First up is Masterblend 4-18-38, your main nutrient powerhouse. Next comes calcium nitrate, which provides essential calcium and nitrogen your plants crave. Finally, there's magnesium sulfate (good old Epsom salt from the pharmacy aisle).

The classic ratio is 2:2:1 respectively. That means if you're using 2 grams of Masterblend, you'll add 2 grams of calcium nitrate and 1 gram of magnesium sulfate. Simple math, right? This tried-and-true formula works wonders for tomatoes, peppers, and many more hydroponic crops. It's like the Swiss army knife of nutrient solutions! Our recipe uses 2:2:1.25 and is what Masterblend now lists on their website. This recipe scales all the way to 100+ gallons. If you prefer the 2:2:1 ratio, you can easily create your own recipe.

Hydroponic Fertilizer Tips

While mixing your Masterblend solution might seem straightforward, there are some sneaky little tricks that'll save you headaches down the road.

Always dissolve your nutrients in the right order. Mix calcium nitrate first, then add your Masterblend, and finally the magnesium sulfate. Why? Because calcium and sulfate really don't play nice together and will throw a precipitation party you definitely weren't invited to.

Water temperature matters more than you'd think. Room temp water dissolves everything smoothly, while cold water acts stubborn. Hot water? That's just asking for nutrient breakdown.

Keep your pH meter calibrated! Nothing ruins a grow faster than wonky readings. And here's a pro tip: always mix slightly more solution than you need – you'll thank yourself later when topping off reservoirs.