How does the grams scale app work?

Scale for Grams uses advanced computer vision to analyze photos and estimate weight. Take a photo of any object — the app identifies it, cross-references known object densities and dimensions, then returns an estimated weight in grams, kilograms, pounds, and ounces within seconds.

Is Scale for Grams free to use?

Yes — Scale for Grams offers 2 free scans per day on the web with no account required. For unlimited scans, weight history, and offline mode, download the iOS app from the App Store.

What can I weigh with this grams scale app?

You can weigh food items, jewelry, coins, packages, fruits, vegetables, electronics, and most everyday objects. The app works best with common items that have well-documented weight ranges. For optimal accuracy, include a reference object like a coin for scale.

How accurate is the weight estimation?

Accuracy varies by object type. For common items like fruits, canned goods, and electronics, estimates typically fall within 10-20% of actual weight. The app performs best with objects that have standardized sizes.

What units does the digital scale support?

Scale for Grams displays weight in 4 units simultaneously: grams (g), kilograms (kg), pounds (lbs), and ounces (oz). All conversions are calculated automatically. The app supports 10 languages.

Reference chart

How Much Do Coins Weigh?

A US penny weighs 2.5 g, a nickel 5 g, a dime 2.268 g and a quarter 5.67 g. US coin weights are minted to tight tolerances, which makes them reliable reference weights for checking or calibrating a scale.

US coin weight chart

Coin	Weight (g)	Weight (oz)	Composition
Penny (1¢)	2.5 g	0.088 oz	Copper-plated zinc (since 1982)
Nickel (5¢)	5 g	0.176 oz	Cupronickel (since 1866)
Dime (10¢)	2.268 g	0.08 oz	Cupronickel clad (since 1965)
Quarter (25¢)	5.67 g	0.2 oz	Cupronickel clad (since 1965)
Half dollar (50¢)	11.34 g	0.4 oz	Cupronickel clad (since 1971)
Dollar coin ($1)	8.1 g	0.286 oz	Manganese brass (since 2000)

Weights per the United States Mint coin specifications. Pre-1965 silver coins and pre-1982 copper pennies weigh more.

Using coins to check a scale

20 nickels= 100 g

40 nickels= 200 g

10 quarters= 56.7 g

4 quarters + 1 nickel= 27.68 g (≈ 1 oz)

Frequently asked questions

How much does a quarter weigh?

A US quarter weighs exactly 5.67 grams (0.2 ounces). Quarters minted since 1965 are cupronickel-clad and all share this standard weight, which makes a quarter a handy reference object for checking a kitchen scale.

How much does a penny weigh?

A US penny minted since 1982 weighs 2.5 grams (0.088 ounces). Older copper pennies (1962–1982) weigh 3.11 grams, so check the year before using a penny as a calibration weight.

How much does a nickel weigh?

A US nickel weighs exactly 5.0 grams (0.176 ounces) — the roundest number of any US coin, which is why nickels are the most popular household calibration weight. Twenty nickels make exactly 100 grams.

Can I use coins to calibrate my scale?

Yes. Because US coin weights are minted to tight tolerances, stacking known coins gives a reliable reference: 20 nickels = 100 g, 40 nickels = 200 g. Place them on the scale and compare the readout to the expected total.

How can I weigh a coin without a scale?

Scale for Grams can estimate coin weight from a photo, and its Currency mode identifies the coin itself — denomination, country and year — using computer vision. It works free in the browser at scaleforgrams.com.

Scale for Grams · Currency mode

Found an unknown coin?

Photograph it — Scale for Grams identifies the coin, its country, denomination and year, and estimates its weight. Free in your browser.

Identify a coin from a photo