Minutes Between Two Times Calculator

Both start and end times are converted to minutes from midnight, then subtracted with overnight wrap-around:

$$T_{\text{start}} = 60 H_{\text{start}} + M_{\text{start}}$$

$$T_{\text{end}} = 60 H_{\text{end}} + M_{\text{end}}$$

$$\Delta M = \begin{cases} T_{\text{end}} - T_{\text{start}} & T_{\text{end}} \geq T_{\text{start}} \\ 1440 - T_{\text{start}} + T_{\text{end}} & T_{\text{end}} < T_{\text{start}} \end{cases}$$

The three outputs derive directly from \(\Delta M\):

$$\text{Total minutes} = \Delta M$$

$$\text{Decimal hours} = \frac{\Delta M}{60}$$

$$\text{Total seconds} = \Delta M \times 60$$

The total seconds output enables conversion to programming-ready values (multiply by 1000 for milliseconds). The decimal hours enables multiplication by hourly rates for cost or compensation calculations.

For durations under 60 minutes, the total minutes output is all you need — it is a simple, single number. For durations over 60 minutes, also note the decimal hours output for billing or scheduling purposes (e.g., 150 minutes = 2.5 hours). The total seconds output is useful when interfacing with technical systems. For sleep tracking, 480 minutes = 8 hours of recommended adult sleep; values below 420 minutes (7 hours) indicate insufficient sleep duration.