What Is Single-Dose Grinding? Pros, Cons and How to Start

Single-dose grinding means weighing out the exact beans for one brew, say 18 g for an espresso or 20 g for a pour-over, pouring them into an empty grinder and grinding until nothing is left. There is no hopper full of beans sitting on top of the machine. Done well, it keeps your beans sealed until the moment you use them, makes switching between coffees easy and gives you the same dose in as you get out.

It is not magic, though. Whether single-dose grinding is worth it depends on how many coffees you drink, how many you rotate and how much your grinder holds back inside.

Key takeaways

• Single dosing = weigh one dose, grind it all, leave the hopper empty.
• The main benefits are fresher beans, easy coffee switching and less waste when dialing in.
• Retention (grounds left inside the grinder) is the key issue; low-retention grinders are built for it.
• A few drops of water on the beans and a gentle tap reduce static and stuck grounds.

In this article

1. What is single-dose grinding?
2. Hopper vs single dose compared
3. Retention explained
4. How to single-dose with any grinder
5. Is it worth it for you?
6. FAQ

What is single-dose grinding?

Traditional café grinders hold a large hopper of beans and grind on demand. That works when you go through a kilo a day. At home, beans in a hopper sit exposed to air and light for days, and every time you change coffees you have to empty the hopper and purge what is stuck inside.

Single dosing flips that routine. Beans stay in their sealed bag or an airtight container, and only one dose ever meets the grinder. Many recent home grinders are designed for this, with small dosing cups instead of hoppers, a straight path from burrs to exit, and often a bellows (a rubber blower) to push out the last grounds.

Hopper grinding vs single-dose grinding

What is popcorning?

When the last few beans bounce around on the burrs instead of being drawn in, they “popcorn.” This can slightly change the grind and slow down the finish. Pressing a light weight or lid on top of the beans, or using a grinder designed for single dosing, helps.

Retention: the real issue with single-dose grinding

Retention is the amount of ground coffee that stays inside the grinder, in the burr chamber, chute and exit. If your grinder holds 1 g and you single-dose 18 g, you may get 17 g out today and an extra stale gram mixed into tomorrow’s dose. That is why single dosing and low retention go together.

Check your grinder’s retention in two minutes

1. Grind a dose and clear the chute as well as you can.
2. Weigh exactly 18.0 g of beans.
3. Grind them all, with the grinder running for a few seconds after the sound changes.
4. Weigh the grounds that come out.
5. Subtract: 18.0 g in minus 17.6 g out = 0.4 g retained.

Repeat three times and average. Under about half a gram is easy to live with; if your number is much higher, purge a little coffee before each brew or tap and blow out the chute.

Static and clumping

Dry beans rubbing against metal and plastic build up static, so grounds cling to the chute and spray around the cup. A popular fix is the Ross droplet technique (RDT): add a drop or two of water to the beans, using a spray bottle or a wet spoon handle, and stir before grinding. Don’t overdo it, as too much water can cause clumping, and check your grinder manufacturer’s advice first.

How to single-dose with any burr grinder

1. Weigh your beans. Use a scale that reads to 0.1 g. Our coffee scale guide explains what to look for.
2. Optional RDT. Add one or two drops of water and stir.
3. Start the grinder first. On many grinders, pouring beans onto spinning burrs reduces popcorning. Check your manual.
4. Pour in the dose. If beans bounce, rest a lid or a light weight on top.
5. Run until empty. Wait until the sound changes and a second or two longer.
6. Clear the chute. Tap the grinder gently or use a bellows if fitted.
7. Weigh the output. Know your retention and adjust your dose if needed.
8. Store beans properly. Keep the bag sealed between doses; see how to store coffee beans.

A bonus tip: pre-weigh a week of doses into small airtight tubes. Mornings become just pour and grind.

Is single-dose grinding worth it for you?

Use this quick checklist. If you tick three or more, single dosing will probably improve your routine.

• You make espresso and dial in carefully.
• You rotate between two or more coffees, or drink decaf in the evening.
• You go through less than a bag of beans a week.
• You already own a scale.
• Your grinder has a small hopper or a dosing cup, or low retention.

If you drink one coffee all week and a whole household shares the grinder, a hopper with an airtight lid is simpler. Neither approach is wrong. If you’re still choosing a grinder, compare burr vs blade grinders first.

Coffees to rotate

Single dosing is made for exploring. The Best Sellers Sample Pack gives you six 2 oz bags (6 Bean, Cowboy, Breakfast, Peru, Mexico and Bali Blue) to compare side by side. Keep Decaf Espresso next to your daily beans for evening shots without emptying a hopper, or add Max Caf Blend for the mornings that need extra kick. Order whole bean to get the full benefit.

Single-dose grinding FAQ

Can I single-dose with a hopper grinder?

Yes. Weigh your dose, grind it all and expect a bit more retention and popcorning. Pressing gently on the beans with the hopper lid helps.

Does single dosing make coffee taste better?

It mainly keeps beans fresher and doses more accurate. The taste benefit is biggest if beans would otherwise sit in a hopper for days.

Is RDT safe for my grinder?

A drop or two of water is common practice, but follow your manufacturer’s guidance and never wet beans heavily.

How much coffee should I single-dose?

Typical doses are 18 g for a double espresso and about 15–20 g for a 250–330 ml pour-over. See our coffee to water ratio guide.

Sources

1. Rave Coffee. What is the Ross Droplet Technique? ravecoffee.co.uk.

Facts checked in October 2026.

Keep reading: Manual vs electric grinder · How to clean a coffee grinder · Best Selling