doublesTrack calories without a food scale.
You can lose fat without weighing food if you log every day, estimate portions with your hand or common objects, count cooking oil, sauces and drinks generously, scan labels for packaged food, and check your estimates against your weight trend after two or three weeks. If the trend isn't moving, eat a little less or tighten up the foods you guess most.
Last updated October 19, 2026. General information, not medical advice.
Why it works
What takes body fat off is a deficit kept up for weeks, not a perfect number on any one day. Estimates are close enough if they're consistent, and a log you keep beats a precise one you quit. Your weight trend is the real check: it tells you whether your estimates add up to a deficit.
People do tend to under-count. In one well-known study, people who said they couldn't lose weight on a low-calorie diet under-reported what they ate by 47% on average (Lichtman et al., 1992). So the trend, not the log, gets the final say.
Portion guides you always have with you
| Hand | About | Use it for |
|---|---|---|
| Palm (thickness too) | 3 to 4 oz cooked | Meat, fish, tofu |
| Fist | 1 cup | Rice, pasta, cereal, fruit |
| Cupped hand | About 1/2 cup | Nuts, granola, chips |
| Thumb | About 1 tablespoon | Oil, butter, peanut butter, dressing |
Hands vary, so treat these as starting points and adjust from your weight trend.
Where estimates go wrong, and the fix
- Cooking oil and butter. A tablespoon of oil is about 120 calories and disappears into food. Assume some was used.
- Sauces, dressings and drinks. Log them every time.
- Restaurant meals. Use the chain's published nutrition when it has it; otherwise estimate high.
- Packaged food. Scan the barcode or read the label instead of guessing.
- Meals you repeat. Get them right once, save them, and reuse them.
In DoublesDoubles is built for estimating: say it, snap it, scan the barcode or label, or tap a saved usual. Every number is an estimate you can fix by saying what's wrong, and when a chain restaurant publishes nutrition, Doubles uses those numbers and says so.
Sources
- Lichtman SW et al. "Discrepancy between self-reported and actual caloric intake and exercise in obese subjects." New England Journal of Medicine, 1992. Link
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