Updated · Built and checked by the PlinzoTools team, formulas tested against published sources
Convert Ounces to Grams instantly with an exact, accurate formula -- no sign-up, no ads blocking the result.
Converting Ounces to Grams means multiplying by an exact, fixed constant (28.34952313) rather than an approximation -- the same factor this calculator uses internally. Weight (more precisely, mass) conversions come up constantly across cooking, shipping, fitness, and international trade, since the US customary system (ounces, pounds, stones) and the metric system (grams, kilograms) are both widely used, often for the exact same real-world item described two different ways. The gram is one-thousandth of a kilogram, the SI base unit of mass. One ounce equals exactly 1/16 of a pound, or about 28.3495 grams.
Enter your value and confirm the "From Unit" dropdown is set to Ounces -- the result grid updates instantly, showing your value converted into every unit in this weight category at once (not just Grams), so you can see multiple equivalent measurements without switching tools. There's no button to press and nothing is sent to a server, so it works the same on a phone with no signal as it does on a desktop.
Grams = Ounces × 28.34952313
The pound is defined as exactly 0.45359237 kilograms by the same 1959 international agreement that fixed the inch -- this makes pound-to-kilogram conversions exact, and every other US customary weight unit (ounces, stones) derives from that same fixed pound definition.
| Ounces | Grams |
|---|---|
| 1 | 28.34952313 |
| 5 | 141.74761563 |
| 10 | 283.49523125 |
| 50 | 1,417.47615625 |
| 100 | 2,834.9523125 |
International shipping and customs paperwork that requires a specific weight unit. Recipe conversion between US customary and metric weight-based ingredient lists. Fitness and health tracking that mixes pounds and kilograms across different apps or regions. For related conversions, see Pounds to Stones and Ounces Converter and GSM to LBS Paper Weight Converter.
This calculator carries full precision internally and only rounds the final displayed result for readability -- if you need more or fewer decimal places than shown, the underlying value is still exact to the limits of floating-point arithmetic.
Multiply the Ounces value by 28.34952313 to get Grams. This calculator does that automatically as you type, so you don't need to do the multiplication by hand.
Yes -- 1 Ounces equals 28.34952313 Grams by definition, so the result is mathematically exact rather than a rounded estimate (the displayed value may be rounded for readability, but the underlying calculation isn't).
Yes -- change the "From Unit" dropdown above the input to switch direction. The same conversion engine handles every unit in this category, not just Ounces and Grams.
Technically mass, though "weight" is the everyday term used for both -- Ounces and Grams here measure the same physical mass regardless of gravity, unlike a physics-specific "weight" (a force) which would vary depending on where it's measured.
Grams is one of the standard units for measuring weight -- see the Practical Uses section above for the specific contexts where it's most commonly encountered.
100 ounces equals 2,834.952313 grams, using the same 28.34952313 factor as the rest of this page.
Multiplying a ounces value by 28.34952 gives you grams. The reverse conversion divides by 28.34952, which is the same as multiplying by 0.03527396. For example, 12.5 ounces × 28.34952 = 354.369 grams, and 60 ounces × 28.34952 = 1,700.971 grams.
One ounce equals exactly 1/16 of a pound, or about 28.3495 grams. The gram is one-thousandth of a kilogram, the SI base unit of mass.
| Ounces | Grams |
|---|---|
| 1 | 28.34952 |
| 2 | 56.69905 |
| 3 | 85.04857 |
| 5 | 141.7476 |
| 10 | 283.4952 |
| 15 | 425.2428 |
| 20 | 566.9905 |
| 25 | 708.7381 |
| 50 | 1,417.476 |
| 75 | 2,126.214 |
| 100 | 2,834.952 |
| 250 | 7,087.381 |
| 500 | 14,174.76 |
| 1,000 | 28,349.52 |
How many grams are in 1 ounces?
1 ounces equals 28.34952 grams.
How many ounces are in 1 grams?
1 grams equals 0.03527396 ounces.
What is 150 ounces in grams?
150 ounces equals 4,252.428 grams, using the same 28.34952 factor as the rest of this chart.
Is this conversion exact or approximate?
The 28.34952 factor comes from a fixed, exact definitional constant, so the underlying math is exact; the numbers on this page are rounded to seven significant digits for readability, and the calculator above keeps the full-precision value.
Values are rounded to seven significant digits for display; the converter above uses the full-precision factor.
Reference: NIST Weights and Measures