Convert ounces to grams in 2 seconds flat.
1 oz x 28.3495 = 28.3495 g
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Ever tried baking cookies using a British recipe only to realize it lists flour in grams instead of ounces? Or maybe you’ve stood in the post office wondering if your 12-ounce package crosses into the next price tier when converted to grams. We’ve all been there – that momentary panic when two measurement systems collide. But here’s the good news: once you understand the ounces-to-grams relationship, you’ll navigate kitchens, labs, and shipping centers like a pro.
Unit definitions
What is an ounce (oz)?
The ounce – specifically the international avoirdupois ounce – is the heavyweight champion of US customary units.
- Symbol: oz
- Common uses: Food packaging, postal weights, body weight (in some contexts)
- Definition: 1/16 of a pound or approximately 28.3495 grams
Fun fact: There’s also the troy ounce (31.1035 grams) used for precious metals, but that’s a different story altogether.
What is a gram (g)?
The gram is the metric system’s featherweight contender, perfect for precision measurements.
- Symbol: g
- Common uses: Scientific experiments, nutritional labels, international recipes
- Definition: 1/1000 of a kilogram, equivalent to the mass of one cubic centimeter of water
Conversion formula
The golden rule for ounce-to-gram conversions:
Grams = Ounces × 28.3495
Why 28.3495? Back in 1959, international agreements standardized the avoirdupois ounce to exactly 28.349523125 grams. Most people round this to 28.35 for simplicity, though our calculator uses the full precision.
Example calculations
- Converting 8 oz to grams:
8 × 28.3495 = 226.796 grams
(That’s about the weight of a medium apple) - Converting 12 oz to grams:
12 × 28.3495 = 340.194 grams
(Equivalent to a standard soda can’s weight)
Conversion tables
Ounces to grams
| Ounces | Grams |
|---|---|
| 1 | 28.35 |
| 2 | 56.70 |
| 3 | 85.05 |
| 4 | 113.40 |
| 5 | 141.75 |
| 6 | 170.10 |
| 7 | 198.45 |
| 8 | 226.80 |
| 9 | 255.15 |
| 10 | 283.50 |
Grams to ounces
| Grams | Ounces |
|---|---|
| 50 | 1.7637 |
| 100 | 3.5274 |
| 150 | 5.2911 |
| 200 | 7.0548 |
| 250 | 8.8185 |
| 300 | 10.5822 |
| 350 | 12.3459 |
| 400 | 14.1096 |
| 450 | 15.8733 |
| 500 | 17.6370 |
Historical background
The ounce traces its roots to teh Roman “uncia” – meaning “one-twelfth” (of a pound). Over centuries, various European countries developed their own ounce measurements until the avoirdupois system became dominant in English-speaking countries. The gram’s story begins during the French Revolution when scientists developed the metric system to standardize measurements. Initially defined using water’s properties, today’s gram is tied to the precise mass of the International Prototype Kilogram.
Interesting facts
- Your average coffee mug holds about 12 fluid ounces, but that’s volume – its weight in grams depends on the material!
- Olympic gold medals contain 6 grams of gold plating over silver – about 0.2116 troy ounces.
- A standard Hershey’s milk chocolate bar weighs 43 grams (1.52 oz) – perfect for dual-system snacking.
- USPS First-Class Mail charges jump at the 3.5 oz (99.22 g) threshold – grams help avoid costly overages.
- Many digital scales let you switch between oz and g with a button press – no math required!
FAQ
Grams are the standard unit for scientific measurements and international recipes, while ounces are commonly used in US packaging. Converting between them ensures accuracy in cooking, mailing, and lab work.
Nope! Fluid ounces measure volume (like liquids), while weight ounces measure mass. They’re about as similar as apples and… well, apple juice.
For rough estimates, multiply ounces by 28.35. If you’re eyeballing ingredients, 1 oz ≈ 28 g works for most everyday needs.
Most countries use grams (metric system), but the US, Liberia, and Myanmar still use ounces/pounds officially. Even there, grams appear in nutritional labels and scientific contexts.
Blame history! The international avoirdupois ounce was redefined in 1959 to align with metric standards, creating that oddly specific conversion factor.