Sermon Series Planner
Plan your sermon series — calculate dates, total sermons, and preparation time needed.
About this calculator
Total Sermons is simply Series Length (weeks) times Sermons Per Week -- a 12-week series with one sermon per week is 12 sermons, while the same 12 weeks preaching twice per week (a Sunday morning and evening service, for example) is 24. Total Prep Hours scales directly with Total Sermons, multiplying it by Prep Hours Per Sermon, so it responds to all three of Series Length, Sermons Per Week, and Prep Hours Per Sermon together -- doubling any one of those three roughly doubles Total Prep Hours. Weekly Prep Hours is a narrower figure: Sermons Per Week times Prep Hours Per Sermon, telling you the prep load in a typical single week of the series regardless of how long the whole series runs.
Series End Date marks the last calendar day of the series -- the end of the final week, not the day the last sermon is preached -- calculated by adding (Series Length in weeks x 7, minus one) days to your chosen start date, so it answers "what calendar date does the series wrap up" rather than a rough week count -- useful for coordinating with the church calendar, guest speakers, or a planned sermon series changeover. If your last sermon lands on a Sunday, for example, Series End Date falls several days later, at the end of that same calendar week. None of the three start-date fields (Start Month, Start Day, Start Year) affect Total Sermons, Total Prep Hours, or Weekly Prep Hours at all -- they only shift where the calculated end date falls.
Inputs
Results
Total Sermons
12
Total Prep Hours
120
How to Use This Calculator
- Enter the series length in weeks and the number of sermons per week.
- Enter the prep hours needed per sermon and the series start date (month, day, year).
- Review the total number of sermons and the calculated end date for the series.
- Check the total prep hours and weekly prep hours needed to prepare the series.
- Adjust the series length, sermons per week, or prep hours to match your preaching schedule.
How the result changes with Series Length (weeks)
| Series Length (weeks) | Total Sermons | Total Prep Hours |
|---|---|---|
| 6 | 6 | 60 |
| 9 | 9 | 90 |
| 18 | 18 | 180 |
| 30 | 30 | 300 |
What each input means
- Series Length (weeks)
- Total weeks in the series.
- Sermons Per Week
- Number of sermons per week.
- Prep Hours Per Sermon
- Preparation hours per sermon.
- Start Month
- Month the series begins.
- Start Day
- Starting day (clamped to the last valid day of Start Month if it doesn't exist, e.g. Feb 31).
- Start Year
- Starting year.
How this is calculated
Worked example, using the default values
- Identify Input Parameters6 parametersSeries Length (weeks) = 12, Sermons Per Week = 1, Prep Hours Per Sermon = 10, Start Month = 1, Start Day = 1, Start Year = 2026 = 6 input(s) provided
- Calculate Total SermonsTotal Sermons = Series Length (weeks) x Sermons Per Week12 x 1 = 12
- Calculate Total Prep HoursTotal Prep Hours = Total Sermons x Prep Hours Per Sermon12 x 10 = 120
- Calculate Series DurationSeries Duration (days) = Series Length (weeks) x 712 x 7 = 84 days
- Calculate Series End DateEnd Date = Start Date + (Series Duration - 1) days1/1/2026 + 83 days = March 25, 2026
Engine last updated . Checked against 2 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Does changing my series start date affect Total Prep Hours?
No. Start Month, Start Day, and Start Year only shift where Series End Date lands on the calendar -- they have no effect on Total Sermons, Total Prep Hours, or Weekly Prep Hours, which are driven entirely by Series Length (weeks), Sermons Per Week, and Prep Hours Per Sermon. Moving your planned start date later in the year pushes the end date later by exactly the same amount, nothing more.
What's the difference between Total Prep Hours and Weekly Prep Hours?
Weekly Prep Hours is Sermons Per Week times Prep Hours Per Sermon -- the prep workload in any single typical week of the series, independent of how long the series runs. Total Prep Hours is that same per-sermon prep time multiplied across every sermon in the entire series (Series Length times Sermons Per Week times Prep Hours Per Sermon), so it grows with the length of the series while Weekly Prep Hours stays constant week to week.
If I add a second weekly service, does that double both prep hours figures?
Yes, both scale the same way. Doubling Sermons Per Week doubles Total Sermons (since it's Series Length times Sermons Per Week), which in turn doubles Total Prep Hours at the same Prep Hours Per Sermon. Weekly Prep Hours doubles for the identical reason -- it is Sermons Per Week times Prep Hours Per Sermon directly, so adding a second weekly sermon doubles your typical week's preparation workload too.
How is the series End Date actually calculated?
The calculator converts Series Length (weeks) into a day count (weeks times 7), subtracts one, and adds that many days to your Start Month, Start Day, and Start Year -- landing on the last calendar day of the series' final week -- then reads the resulting calendar month, day, and year back out as Series End Date. It uses calendar-field arithmetic (year, month, and day, not a fixed 24-hour-per-day offset), so the result stays correct across daylight saving time transitions. It is still not a church-calendar-aware calculation, so it will land on whatever weekday the arithmetic produces rather than always landing on a Sunday.
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