1978 in Roman numerals at a glance
- Roman numeral
- MCMLXXVIII
- Lowercase
- mcmlxxviii
- Letters
- 10
- Parts
- M · CM · L · X · X · V · I · I · I
- Subtractive pairs
- CM
- Read aloud
- nineteen seventy-eight
- Leap year?
- No
How MCMLXXVIII is built
Roman numerals are written one decimal place at a time, from the largest place to the smallest. Converting each digit of 1978 separately and joining the pieces gives MCMLXXVIII:
| Place | Digit | Value | Numeral |
|---|---|---|---|
| Thousands | 1 | 1,000 | M |
| Hundreds | 9 | 900 | CM |
| Tens | 7 | 70 | LXX |
| Ones | 8 | 8 | VIII |
Reading it back, left to right:
- M = 1,000 → running total 1,000
- CM = 900 (M minus C) → running total 1,900
- L = 50 → running total 1,950
- X = 10 → running total 1,960
- X = 10 → running total 1,970
- V = 5 → running total 1,975
- I = 1 → running total 1,976
- I = 1 → running total 1,977
- I = 1 → running total 1,978
Why MCMLXXVIII has 10 letters
Every year from 1900 to 1999 begins with MCM (1,900); the rest of MCMLXXVIII after MCM — LXXVIII — spells out 78. Of the 201 years from 1900 to 2100, 1 have a longer numeral and 195 a shorter one.
The rules MCMLXXVIII follows
- Largest to smallest. MCMLXXVIII uses the symbols M, C, L, X, V and I (10 characters in all), and the values never increase from left to right except inside a subtractive pair.
- Subtraction. CM (900) is a subtractive pair: a smaller symbol in front of a larger one is taken away from it. Only six pairs are allowed — IV, IX, XL, XC, CD and CM — and MCMLXXVIII uses one of them.
- Repetition. XX repeats X two times and III repeats I three times. I, X, C and M may repeat up to three times in a row; V, L and D never repeat.
Common mistakes when writing 1978
- MDCCCCLXXVIII — wrong because standard numerals never repeat a symbol four times; 900 is written CM. The correct form is MCMLXXVIII.
The year 1978 in Roman numerals: where it appears
- Film and TV credits. Copyright lines at the end of films and TV programs of the period commonly gave the year in numerals — a 1978 production might end with “Copyright MCMLXXVIII.”
- Championship numbering. The pro football championship played in early 1978 was game XII (12), since the series began with game I in January 1967.
- On a calendar. 1978 was not a leap year (365 days), and January 1 fell on a Sunday. A full date such as July 4, 1978 is often written VII · IV · MCMLXXVIII.
To turn a complete birth date or wedding date into numerals — with dots, dashes or spaces in US or day-first order — use the Roman numeral date converter.
Years around 1978 in Roman numerals
| Year | Roman numeral | Letters |
|---|---|---|
| 1973 | MCMLXXIII | 9 |
| 1974 | MCMLXXIV | 8 |
| 1975 | MCMLXXV | 7 |
| 1976 | MCMLXXVI | 8 |
| 1977 | MCMLXXVII | 9 |
| 1978 | MCMLXXVIII | 10 |
| 1979 | MCMLXXIX | 8 |
| 1980 | MCMLXXX | 7 |
| 1981 | MCMLXXXI | 8 |
| 1982 | MCMLXXXII | 9 |
| 1983 | MCMLXXXIII | 10 |
Frequently asked questions
How do you write 1978 in Roman numerals?
1978 is written MCMLXXVIII. Break it into M (1000), CM (900), L (50), X (10), X (10), V (5), I (1), I (1), I (1) and add the parts: 1000 + 900 + 50 + 10 + 10 + 5 + 1 + 1 + 1 = 1978.
Is MDCCCCLXXVIII a correct way to write 1978?
No. MDCCCCLXXVIII is wrong because standard numerals never repeat a symbol four times; 900 is written CM. The standard numeral for 1978 is MCMLXXVIII.
How do you say MCMLXXVIII?
Read the value, not the letters: MCMLXXVIII is the year 1978, said “nineteen seventy-eight.” Spelling out the letters one by one is only useful when checking a carving or engraving.
What year comes after MCMLXXVIII?
1979, written MCMLXXIX. The year before, 1977, is MCMLXXVII.