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Months (30 days) to Days (mo to d)

Convert months (30 days) to days: 1 mo = 30 d. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.

Formula

1 mo = 30 d

days = months (30 days) × 30 — reverse: months (30 days) = days × 0.03333333333

The factor is derived from the SI definitions of both units (base unit: s) as listed in NIST SP 811; results on this page are shown to 6 significant figures, the API returns up to 12.

Worked examples

5 mo = 150 d
12.5 mo = 375 d
100 mo = 3000 d

Months (30 days) to days conversion table

Months (30 days) (mo)	Days (d)
1	30
2	60
3	90
4	120
5	150
6	180
7	210
8	240
9	270
10	300
15	450
20	600
25	750
30	900
40	1200
50	1500
75	2250
100	3000
200	6000
250	7500
500	15000
1000	30000

FAQ

How many days are in one month?

1 mo = 30 d. The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.

What is the formula to convert months (30 days) to days?

Multiply the value in months (30 days) by 30: days = months (30 days) × 30. For example, 5 mo = 150 d.

How do I convert days back to months (30 days)?

Multiply by the inverse factor 0.03333333333 (months (30 days) = days × 0.03333333333), or use the days-to-months (30 days) page.

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Machine access

API: GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=month_30&to_unit=day
MCP: server https://tttkmbb.com/mcp, tool convert_units with {"value":5,"from_unit":"month_30","to_unit":"day"}
Markdown: https://tttkmbb.com/conversion/months-to-days.md · JSON: https://tttkmbb.com/conversion/months-to-days.json (add ?value= for a result) · Units: /api/v1/units?quantity=time
OpenAPI operationId: convert_units. Freshness: static. Authentication: none.