Oz to Grams Converter: Easy Weight Conversion for Avoirdupois and Troy Ounces
Convert ounces to grams in seconds: multiply avoirdupois ounces by 28.349523125 g or troy ounces by 31.1034768 g (NIST, 2019). This converter handles both directions, lets you pick precision, and displays instant results. Perfect for cooking, lab work, or valuing bullion.
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How to use the tool
Select Conversion Type – Pick “Ounces → Grams” or “Grams → Ounces”.
Enter Weight – Example 1: 7.3; Example 2: 250.
Choose Ounce Standard – “Avoirdupois” for groceries; “Troy” for precious metals.
Set Precision – 0 – 10 decimals; try 1 or 4 for variety.
Press Convert – Result appears instantly beneath the form.
7.3 avoirdupois oz → g
7.3 × 28.349523125 = 206.951 g (rounded to 3 dp).
250 g → troy oz
250 / 31.1034768 = 8.033 troy oz (rounded to 3 dp).
Quick-Facts
1 avoirdupois oz = 28.349523125 g (NIST Handbook 44, 2020).
1 troy oz = 31.1034768 g (NIST Handbook 44, 2020).
Avoirdupois pound contains 16 oz, troy pound 12 oz (OIML R 125, 2007).
Typical kitchen scales read ±0.1 g up to 5 kg (Consumer Reports, 2021).
Gold prices quoted worldwide in troy ounces (LBMA, 2023).
FAQ
What is an avoirdupois ounce?
An avoirdupois ounce is the everyday U.S./UK measure for food and freight, weighing exactly 28.349523125 g (NIST, 2019).
How heavy is a troy ounce?
A troy ounce, used for bullion and gems, equals 31.1034768 g, about 9 % heavier than an avoirdupois ounce (LBMA, 2023).
Why must I pick the ounce type?
The two ounce standards differ; selecting the wrong one skews results by up to 2.75 g per ounce—significant when pricing gold (US Mint, 2022).
What precision should I choose?
Use 0–1 decimals for cooking, 2–4 for lab work, and up to 6 when valuing metals where 0.001 oz can shift price by dollars (Kitco, 2023).
Does the converter handle negative numbers?
No. Weight is inherently positive; the form rejects negative or zero inputs to prevent nonsensical results.
Can I convert fluid ounces?
Fluid ounces measure volume, not mass. Use a density-based volume converter instead because water’s 1 fl oz weighs about 29.57 g at 20 °C (US FDA, 2020).
Is the math suitable for legal trade?
Yes, the factors match international standards, but certified scales and official documents remain mandatory for regulated sales (OIML R 76, 2006).
How can I verify the results?
Multiply or divide your value by the listed factors and compare against a scientific calculator or spreadsheet; results should match to the chosen decimal place.
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