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Days to Hours (d to h)

Convert days to hours: 1 d = 24 h. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.

Formula

1 d = 24 h

hours = days × 24 — reverse: days = hours × 0.04166666667

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 d = 120 h
12.5 d = 300 h
100 d = 2400 h

Days to hours conversion table

Days (d)	Hours (h)
1	24
2	48
3	72
4	96
5	120
6	144
7	168
8	192
9	216
10	240
15	360
20	480
25	600
30	720
40	960
50	1200
75	1800
100	2400
200	4800
250	6000
500	12000
1000	24000

FAQ

How many hours are in one day?

1 d = 24 h. 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 days to hours?

Multiply the value in days by 24: hours = days × 24. For example, 5 d = 120 h.

How do I convert hours back to days?

Multiply by the inverse factor 0.04166666667 (days = hours × 0.04166666667), or use the hours-to-days page.

Related conversions

Hours to days (reverse)
Time Converter — all time units in one tool
Hours to Minutes
Minutes to Hours
Minutes to Seconds
Seconds to Minutes
Weeks to Days
Days to Weeks
Years (365 days) to Days
Days to Years (365 days)

Machine access

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