Honest comparison
Scale App vs Kitchen Scale: Can Your Phone Really Weigh Things?
A kitchen scale measures weight to about ±1 gram; a camera-based scale app estimates it, typically within 10–20% for everyday objects. That single difference decides which one you should reach for — here's the breakdown by use case.
Last updated July 6, 2026 · Written by the Scale for Grams team — yes, we make the app, and we'll still tell you to buy a scale for baking.
Side by side
| Criteria | Scale app (photo AI) | Kitchen scale |
|---|---|---|
| Typical accuracy | ±10–20% (AI estimate) | ±1 g |
| Cost | Free tier | $10–30 |
| Always in your pocket | ✓ | — |
| Works on any object size | ✓ | Up to platform limit (~5 kg typical) |
| Good for baking precision | — | ✓ |
| Good for quick estimates | ✓ | ✓ |
| Extra info (calories, size, ID) | ✓ | — |
| Needs batteries/charging | Uses your phone | ✓ |
The honest verdict
Own both. A $15 kitchen scale is unbeatable for baking, coffee and anything where grams change outcomes — if you cook seriously, buy one (Wirecutter's picks are a good start). But the scale lives in one drawer, and questions about weight happen everywhere else: the post office queue, the market, the garage, the packing suitcase. That's the gap Scale for Grams fills — a good-enough answer from a photo, anywhere, in seconds.
Frequently asked questions
Can a phone app really weigh things?
Phone screens cannot sense weight, so no app takes a true measurement through the display. What a camera-based app like Scale for Grams does is estimate weight from a photo — identifying the object and inferring mass from known sizes and densities. Estimates for common items typically land within 10–20% of the real weight.
Is a scale app accurate enough for cooking?
For rough portioning — a serving of pasta, an apple for calorie logging — a 10–20% estimate is usually fine. For baking, where a few grams of yeast or salt change the result, use a real kitchen scale: bread and pastry need ±1 g precision that no phone estimate provides.
When is a scale app better than a kitchen scale?
Whenever the scale isn't there: checking a parcel before pricing shipping, weighing produce at a market, estimating luggage items while packing, or anything too large for a kitchen scale platform. The best tool is the one you have with you — and the phone always is.
See what a photo estimate looks like
Two free scans a day in the browser — no download, no account needed to try it.
Weigh something now