There is one question almost every South Indian filter coffee beginner eventually asks:

“How much coffee powder should I use?”

And then comes the second:

“How much water?”

And then, inevitably:

“Why is my coffee still not tasting right?”

The problem is that there isn't one magical ratio that produces the perfect cup for everyone.

The coffee blend, grind size, filter, amount of water, brewing method, decoction strength, milk and even your personal preference all affect the final cup.

That's why simply telling someone to use a particular ratio isn't particularly useful.

Instead, it's better to understand how the ratio changes your coffee, and how to adjust it when something goes wrong.

This guide gives you a practical starting framework for making South Indian filter coffee at home.

First: What Does “Coffee Ratio” Actually Mean?

When coffee drinkers talk about a ratio such as 1:6 or 1:8, they're generally talking about the relationship between:

Coffee powder : water used for brewing

For example:

30 g coffee + 180 g water = 1:6

But there's an important distinction.

The water you put into the upper chamber of your South Indian filter is not necessarily the amount of coffee you eventually drink. Some water remains in the coffee bed and some is retained during brewing.

What you collect is your decoction.

You then decide how much decoction to combine with milk and/or water to create your final cup.

That's why there are really three variables:

Coffee powder → water for decoction → decoction-to-milk ratio

Understanding all three makes it much easier to control your coffee.

A Practical Starting Ratio for South Indian Filter Coffee

Rather than treating one number as universally correct, use a range as your starting point.

Starting brewing guide

These are starting ranges, not rules. Your ideal ratio may be different depending on the coffee, grind, filter and the cup you're trying to make.

For example, recent Indian coffee discussions show home brewers experimenting around 1:5–1:8 and adjusting according to whether they want a concentrated decoction or a larger, lighter brew.

The important thing is to change one variable at a time.

Want Stronger Coffee? Don't Just Add More Sugar

This is where many people go wrong.

If your coffee tastes weak, adding more sugar won't make it stronger. You need to change the coffee concentration.

Start by trying one of these:

1. Option 1: Use more coffee
   If you're currently using 20 g, try 25 g.
2. Option 2: Use less brewing water
   For example, reduce your brewing water while keeping the coffee quantity constant.
3. Option 3: Use a stronger decoction-to-milk ratio
   You might already have a sufficiently concentrated decoction but be diluting it too much with milk.

This distinction is important.

Strong coffee and more coffee flavour are not always the same thing.

The Decoction-to-Milk Ratio Matters More Than You Think

Imagine you've made a concentrated decoction.

You now have two cups:

They're going to taste very different.

The second cup will obviously have a much stronger coffee presence.

This is why someone can use exactly the same coffee powder and brewing ratio as you do and still produce a much stronger cup. They may simply be using more decoction relative to milk.

One recent discussion described a brewer using roughly a 1:1 to 1:1.5 decoction-to-milk ratio specifically to achieve an extra-strong cup.

That's a useful illustration of the principle, but don't treat it as a universal recipe.

Your Coffee Is Weak. What Should You Change?

Don't immediately change everything. Use this sequence.

1. Step 1: Check your coffee quantity
   Are you using enough coffee for the amount of water? If you're using very little coffee and a lot of water, your decoction may naturally be weak.
2. Step 2: Check your brewing water
   Try reducing the amount of water.
3. Step 3: Check the grind
   MokkaFarms currently recommends fine grind when you want higher/stronger decoction, medium grind for moderate strength and coarse grind for lighter strength.
4. Step 4: Check the filter
   Your filter affects how quickly water passes through the coffee bed. A recent Indian coffee discussion about thin decoction illustrates how difficult it can be to diagnose the problem because coffee blend, ratio and filter behaviour can all interact.
5. Step 5: Adjust your milk
   If the decoction itself tastes good but the final drink is weak, you may simply be adding too much milk.

What If Your Coffee Is Bitter?

This is where “strong” and “bitter” get confused. They aren't the same thing.

You can have:

Strong + balanced

or

Strong + bitter

The goal isn't simply maximum intensity.

If your coffee tastes bitter or harsh, consider:

• Using slightly less coffee
• Increasing the water slightly
• Checking whether your grind is too fine
• Avoiding excessively long extraction
• Checking the coffee itself
• Adjusting the milk ratio

Don't respond to bitterness by automatically adding more milk. You might simply be masking the problem.

What If Your Decoction Is Too Thin?

This is one of the most common frustrations discussed by South Indian filter coffee beginners.

Recent discussions show people specifically asking why their decoction isn't thick or viscous enough, with suggestions ranging from changing the coffee/chicory ratio to adjusting water, grind and filter technique.

But here's an important point: A thick decoction isn't automatically a better decoction.

Texture and taste aren't the same thing.

Chicory can contribute body and texture, which is one reason traditional coffee-chicory blends can produce a noticeably different cup from 100% coffee.

MokkaFarms currently offers coffees across a wide range of compositions, including 100% Arabica, Arabica-Robusta blends and coffee-chicory blends, so consumers can experience how composition changes the cup.

If you're switching from a coffee-chicory blend to 100% coffee, don't assume your brewing parameters will produce exactly the same appearance. The coffee itself has changed.

Does More Chicory Mean Stronger Coffee?

Not necessarily. This is an important distinction.

Chicory can influence:

• Body
• Texture
• Roast character
• Bitterness
• Aroma
• Overall mouthfeel

But coffee strength isn't simply a measure of chicory percentage.

That's why two blends with different coffee/chicory compositions can produce very different cups even when brewed using similar quantities. And it's also why “more chicory = better filter coffee” is far too simplistic.

The right blend depends on what you actually enjoy.

How Much Coffee Should You Use for One Person?

For a beginner, don't start by obsessing over the perfect number. Start with a measurable recipe.

For example:

1. Beginner starting point
   • 15–20 g coffee
   • 90–150 ml brewing water
2. Then prepare the decoction and adjust your final milk/decoction ratio to taste.
3. If the result is too weak: increase coffee or reduce brewing water.
4. If it's too strong: dilute the final drink or reduce coffee.
5. If it's bitter: adjust extraction/grind/quantity rather than simply adding sugar.

The important thing is to measure your first few brews. Once you've found what works for you, you can stop measuring every morning.

The Mokka Filter Coffee Adjustment Framework

Instead of memorizing recipes, use this simple framework:

If your coffee is...

This is much more useful than saying: “The perfect ratio is X:Y.”

Because your perfect ratio is the one that produces the cup you actually enjoy.

Don't Change Five Things at Once

This is probably the most useful advice for anyone learning filter coffee.

Suppose today's coffee tastes weak.

Tomorrow you:

• Add more coffee
• Use less water
• Change the grind
• Change the milk
• Change the brewing time

Now it tastes better. But you have no idea why.

Instead, change one thing.

For example:

Day 1: 20 g coffee + 140 ml water

Day 2: 25 g coffee + 140 ml water

Day 3: 25 g coffee + 120 ml water

Taste each version.

You're effectively running a small experiment.

Within a few brews, you'll understand your coffee much better.

Your Filter Coffee Brewing Cheat Sheet

Save this for your next brew.

Start here

• Coffee: 15–20 g
• Brewing water: 90–150 ml
• Grind: Start with the grind appropriate for your filter and desired strength
• Milk: Adjust according to how strong you want the final cup
• Sugar: Optional

Then adjust:

• Too weak? More coffee / less water / more decoction
• Too strong? More milk or water
• Too bitter? Check extraction and grind
• Too thin? Check ratio, grind, filter and coffee composition
• Great decoction but weak cup? Change the decoction-to-milk ratio

There Isn't One “Perfect” Filter Coffee Ratio

This is perhaps the biggest misconception to get rid of.

Ask five experienced South Indian filter coffee drinkers for their recipe and you may get five different answers.

That's not necessarily because four of them are wrong.

They're probably optimizing for different things:

• One wants a strong, intense cup.
• Another wants smoothness.
• Someone else wants more body.
• Someone drinks mostly milk coffee.
• Someone else drinks their coffee almost black.
• And someone may be using a completely different coffee blend.

So don't chase a universal number. Start with a ratio. Taste. Adjust. Repeat.

That's how you find your filter coffee. And once you've found it, write it down. Because the best coffee recipe isn't the one that someone on the internet says is perfect.

It's the one that makes you look forward to your next cup.