Troy Ounce to Milligram Converter

Mass Converter

26 units available

Decimals:

From

To

31,103.4768

1 oz t = 31,103.4768 mg

Formula:

mg = oz t × 31,103.4768

With your value: 1 oz t = 31,103.4768 mg

How big is that?

Everyday references on a logarithmic scale, all expressed in troy ounce so you can sanity-check the result.

Paperclip (1/31 your value)0.0322 oz t

AA battery (1/1.3 your value)0.772 oz t

Your value1.00 oz t

Can of soda (13× your value)12.5 oz t

Bag of sugar (32× your value)32.2 oz t

House cat (1.4e+2× your value)145 oz t

Other Troy Ounce to Milligram conversions

2 oz t to mg 3 oz t to mg 4 oz t to mg 5 oz t to mg 6 oz t to mg 7 oz t to mg 8 oz t to mg

Troy Ounce to Milligram Conversion Table

Troy Ounce (oz t)	Milligram (mg)
0.5	15,551.7384
1	31,103.4768
2	62,206.9536
5	155,517.384
10	311,034.768
15	466,552.152
20	622,069.536
25	777,586.92
50	1,555,173.84
100	3,110,347.68
250	7,775,869.2
500	15,551,738.4
1000	31,103,476.8

Milligram to Troy Ounce Conversion Table

Milligram (mg)	Troy Ounce (oz t)
0.5	1.607537e-5
1	3.215075e-5
2	6.430149e-5
5	0.000161
10	0.000322
15	0.000482
20	0.000643
25	0.000804
50	0.001608
100	0.003215
250	0.008038
500	0.016075
1000	0.032151

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Troy Ounce (oz t)

Mass

Exact conversion

1 troy ounce = 480 grains = 0.031 103 476 8 kg exactly. Used for precious metals only.

Source: NIST Handbook 44, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Milligram (mg)

Mass

Exact conversion

Traceable to the kilogram, defined by fixing the Planck constant at 6.626 070 15 × 10⁻³⁴ J·s. Avoirdupois masses derive from the 1959 international pound (0.453 592 37 kg exactly).

Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)

Bureau International des Poids et Mesures · Reviewed 2026-07-01

How to Convert Troy Ounce to Milligram

To convert from Troy Ounce (oz t) to Milligram (mg), multiply the value by 31,103.4768.

Formula: mg = oz t × 31,103.4768

Reverse: oz t = mg × 0.0000321507

Step-by-Step Example

Start with your value in Troy Ounce. For example: 5 oz t
Multiply by the conversion factor: 5 x 31,103.4768
The result is: 155,517.384 mg

About Troy Ounce

The troy ounce equals approximately 31.1 grams and is used for weighing precious metals like gold, silver, and platinum.

Common uses: gold trading, silver markets, precious metals.

About Milligram

The milligram equals one thousandth of a gram and is the standard unit for drug dosage and nutrient quantities.

Common uses: medication dosage, nutrition labels, laboratory work.

Frequently Asked Questions

How many Milligram are in 1 Troy Ounce?

There are exactly 31,103.4768 Milligram in 1 Troy Ounce. This means the conversion factor from Troy Ounce to Milligram is 31,103.4768.

What is the formula to convert Troy Ounce to Milligram?

The formula to convert Troy Ounce to Milligram is: mg = oz t × 31,103.4768. For example, to convert 10 Troy Ounce to Milligram, you would multiply 10 by 31,103.4768.

What is a Troy Ounce?