The best food scales with a nutritional calculator: on the scale, or on your phone

Two kinds of calculator

"Nutritional calculator" is sold two ways, and they suit different kitchens.

On the scale. Greater Goods programs about 2,000 ingredients into the unit and shows calories, protein, carbs and fat on its own backlit LCD. You type a food code, put the food on, read the numbers. No Bluetooth, no account, no app update, nothing to charge — and no way to get the numbers off the scale except by reading them.

In an app. Etekcity, COSORI and RENPHO put a Bluetooth radio in the scale and the calculator on your phone, backed by a commercial food database. That buys you roughly a million foods instead of two thousand, barcode search, a running daily total and, in some cases, an export. It costs you a phone on the counter and an account.

Which is right is a workflow question, not a spec question. If you already log every meal in an app, the scale's own calculator is a feature you will never open. If you do not log and do not want to, an on-scale calculator is the only one you will actually use. The broader smart-scale field, judged on hardware rather than databases, is on best smart food scales, and the two models that define each approach are set against each other on Etekcity vs Greater Goods.

Database size and nutrient count

Every figure quoted from the maker's own product page, or from the live retailer listing where that is the document the maker now publishes to; both are linked in Sources.

Two honest observations about that table. RENPHO returns the most nutrients and is the only one that reads them out on the scale as well as in an app, but its 800,000-food database is the smaller of the two that publish a number. And 2,000 ingredients sounds tiny next to a million — until you notice that a week of meal prep uses about fifteen ingredients, and that 99 custom slots hold the packaged items a database would get wrong anyway.

Where the numbers go afterwards

This is the spec that decides whether a nutrition scale saves time or adds a step. Etekcity's ESN00 page states that VeSync "connects to Apple Health and Fitbit" — so a weigh-in can end up in the app you already use. COSORI's page states day, week and month totals inside VeSync, which is a report rather than an export. RENPHO's Calibra+ listing states Apple Health sync and daily, weekly and monthly reports, and the Luminary's page does not repeat the ESN00's Apple Health claim.

If you live in MyFitnessPal, none of these scales promises to write to it, and you will be typing the number in either way. In that case the calculator is a convenience and not a workflow, and a plain accurate scale does the job — the argument is made in full on how to use a food scale for macros.

What a nutrition scale cannot do

Every one of these calculators is doing the same thing: multiplying your weight reading by a per-100 g figure from a database. That means three limits worth knowing before you buy.

It cannot see the food. Pick "chicken breast" and it will use a generic entry, which may be raw or cooked, skin-on or skinless. Whether you weigh before or after cooking changes the answer by 20 to 30%, and no scale resolves that for you — the rule is on whether to weigh food cooked or raw.

It cannot add a mixed dish. A calculator that handles one ingredient at a time is fine for portioning chicken and rice and useless for a chili you cooked in a pot. That is a recipe-level job, and an app does it.

It cannot read below its graduation. Every scale here reads in 1 g steps, and COSORI states a 3 g minimum. A 5 g dose of creatine is on the edge of what any of them can resolve.