Ratio Four Drip Coffee Machine
- 5 to 20 oz per brew, one or two cups or a travel mug
- 195 to 203°F (91 to 95°C) brew water temperature
- 11.5 in tall, 7.5 in wide on the counter
- Removable water tank fills at the sink or on a scale
- Reusable filter, ground coffee only
- Carafe included, not dishwasher safe
- 5.22 kg, metal build, matte black
Last refreshed Jun 15, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A tidy countertop brewer for one or two people who want steady brew temperature and small batches. It will not fill a pot for a crowd, and only ground coffee goes in.
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ASIN: B0DKGCL1MRCategory: Coffee Machines
Overview
Brewing one or two cups at a time, the Ratio Four heats water in a compact metal body and drips it over ground coffee in a reusable filter into a carafe. The water tank lifts off for refills, so you can carry it to the sink or set it on a scale.
Temperature control leads: the heating element holds water within the range the Specialty Coffee Association sets for brewing. Batch size tops out at a large mug or a pair of cups, and nothing in the listing mentions a grinder, timer or hot plate.
Who it's for
Small kitchens and single coffee drinkers who brew a mug or two each morning get a compact machine with measured water. Those who entertain or need a programmable start should look elsewhere.
Pros and cons
- Brew temperature held to SCA range
- Removable tank refills at the sink
- Tank can be weighed for exact water
- Compact footprint on the counter
- Small brew volume for groups
- Not dishwasher safe
- Wattage not listed
- Ground coffee only, no grinder
Performance notes
Cup quality comes down to water temperature at the grounds and the coffee to water ratio. The heating element holds a narrow range that the Specialty Coffee Association endorses, and the removable tank lets you weigh water rather than eyeball a line. Grind size and dose remain on you, since the machine takes pre-ground coffee.
Specifications
| Brand | Ratio |
|---|---|
| Dimensions & fit | |
| Item weight | 11.51 pounds |
| Capacity & performance | |
| Brew volume | 0.31 pounds |
| Brew temperature | 195 °F |
| Power & efficiency | |
| Power Source | Corded Electric |
| Construction & materials | |
| Material | Metal |
| Color | Matte Black |
| Compatibility & installation | |
| Smart Home Compatibility | Not Smart Home Compatible |
| Included components | |
| Included Components | Carafe |
| Other details | |
| Coffee Maker Type | Drip Coffee Machine |
| Coffee Input Type | Ground Coffee |
| Operation Mode | Fully Automatic |
| Filter Type | Reusable |
| Is the item dishwasher safe | No |
| Water tank | Removable |
Frequently asked questions
Will a travel mug fit under the Ratio Four instead of the carafe?
The listing says the 5 to 20 ounce range covers a big travel mug, but no clearance height is given, so check a tall mug before relying on it.
Can the Ratio Four brew whole coffee beans?
No. Coffee input is listed as ground coffee and no grinder is mentioned, so beans must be ground first.
Does the Ratio Four need paper filters?
The filter type is listed as reusable, so paper filters are not required.
Does the Ratio Four connect to an app or smart home system?
No. It is listed as not smart home compatible.