Time Converter

Time converter for seconds, minutes, hours, days, weeks, months, and years

A time converter helps you translate a duration from one unit into another, such as converting hours into minutes, weeks into days, or seconds into hours. This is useful for planning, reporting, studying, fitness tracking, work logs, billing, and any situation where time is recorded in one unit but needs to be understood in another.

This calculator is designed for two common needs. First, quick everyday conversions where you just want the answer fast. Second, more careful conversions where “months” and “years” are involved and you want to control the assumption behind those units. Unlike seconds, minutes, hours, days, and weeks, months and years are not fixed lengths in the real world. A month can be 28, 29, 30, or 31 days, and a year can be 365 or 366 days. For many use cases you still need a single conversion rule, so this calculator lets you set it explicitly.

To use it, enter a value, choose the unit you are converting from, and choose the unit you want to convert to. The result will show the converted value, a quick breakdown into common time parts, and a simple reference table so you can sanity-check the magnitude. If you are converting to or from months or years, you can optionally adjust “days per month” and “days per year” to match your context. If you do not change these, the calculator uses common average approximations that work well for general planning.

Assumptions and how to use this calculator

• Seconds, minutes, hours, days, and weeks use fixed definitions (60 seconds per minute, 60 minutes per hour, 24 hours per day, 7 days per week).
• Months and years require an assumption. By default this calculator uses 30.44 days per month and 365.24 days per year, which are widely used average approximations.
• If your scenario is tied to real calendar dates, convert using dates in a calendar tool or calculate the actual number of days between two dates, then convert to your target unit.
• For billing or reporting, use the conventions in your contract or policy. Some organizations define a month as 30 days, or use 365 days per year for simplicity.
• Rounding is normal. For large conversions (for example, seconds to years), small rounding differences are expected depending on your month/year assumptions.

Common questions

Why do month and year conversions sometimes look “off”?

Months and years are not a single fixed length. If you convert 1 month into days, the correct answer depends on which month you mean and whether you care about a specific calendar period. This calculator uses averages by default, but you can change the assumptions to match your use case.

What should I enter for “days per month”?

If you just want a general-purpose result, keep the default. If you are using a business rule, set it to that rule (for example, 30). If you are working with a specific month, you can set it to 28, 29, 30, or 31, but remember that doing so makes the conversion “month-specific” and may not apply elsewhere.

What’s the difference between 365 and 365.24 days per year?

365 is the common “non-leap-year” assumption and is often used in simple models. 365.24 is an average that better reflects the long-term length of a calendar year when leap years are accounted for. Neither is universally correct; the right choice depends on whether you need a simple convention or a more realistic average.

Can this calculator tell me the exact number of months between two dates?

No. That is a date problem, not a unit conversion problem. If you need exact calendar differences, you should calculate the difference between two dates (including calendar month boundaries) and then convert the resulting days or hours. This calculator focuses on converting a duration value between units under a stated assumption.

How can I improve accuracy for real-world planning?

Use the smallest reliable unit you know (often minutes, hours, or days), then convert upward. If your timeline crosses different months or includes a known set of dates, compute the actual day count first. For contracts and payroll, follow the definition your organization uses rather than a generic average.