Denominations as of the Fourth Century A.D.

in gold:

Solidus (after 312 AD)     ca. 2 cm, ca. 4.3-4.5 gr

Semissis                         ca. 1.6 cm, ca. 2.15-2.3 gr

Tremissis                        ca. 1.3 cm, ca. 1.5 gr

in silver:

Argenteus                    up to 2.5 cm, ca. 2.6-3.0 gr

Miliarense                    ca. 2.1-2.4 cm, ca. 4-5 gr

Siliqua                         ca. 1.7-2.0 cm, ca. 1.7-3.4 gr

Half Siliqua                  ca. 1.3 cm,  ca. 0.9-1.3 gr

in bronze:
 

reduced
Follis                           ca. 2.8 cm or less, 9-10 gr, sometimes with silver on surface

Late Roman Bronze Radiates, used into the Tetrachy, same size and design as the silver Antonininus had been

Doppelmaiorina            ca. 3 cm, ca. 7.6-9 gr

Centenionalis                ca. 2 cm, ca. 4-5 gr

Maiorina                      ca. 2 cm, ca. 4-5 gr

Halbcentenionalis          ca. 0.9-1.0 cm , ca. 1.3-1.8 gr

The above names of the denominations are rather questionable, and names also changed over the decades. An alternative -in my view preferable - way of categorizing the late Roman bronze coinage that is frequently used:

AE1                            above 2.5 cm

AE2                            2.1 - 2.5 cm

AE3                            1.7 - 2.1 cm

AE4                            under 1.7 cm

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