Slideshow Timing Calculator
Time your slideshow perfectly: enter your slide count and total duration in seconds for a start/end timeline with transitions and smart holds.
Slideshow Timing Planner
Turn your goal into a dated, step-by-step plan.
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What is Slideshow timing calculator?
Slideshow Timing Planner — Time your slideshow perfectly: enter your slide count and total duration in seconds for a start/end timeline with transitions and smart holds.
Pure arithmetic, never AI: the tool subtracts all transitions from the total (non-overlapping model), then divides the remaining hold time equally or proportionally to per-slide character counts (minimum weight 10 so empty slides still get a beat). Milliseconds are allocated with the largest-remainder method so the timeline always sums to the total exactly. Output is a timing plan — no media is rendered, and holds exclude export time.
Why use this slideshow timing calculator?
Built for slideshow timing calculator
Time your slideshow perfectly: enter your slide count and total duration in seconds for a start/end timeline with transitions and smart holds.
Transparent & honest
Non-overlapping model: sum(holds) + transitions = total; cross-dissolves that overlap holds are not modeled.
Private by design
Everything runs in your browser. Your inputs never leave your device.
Works everywhere
Fully responsive — perfect on desktop, tablet, and mobile. No app needed.
Regularly updated
Regularly maintained and reviewed to ensure accuracy.
Free forever
No accounts, no limits, no watermarks. Use Slideshow Timing Planner as much as you need.
How to use Slideshow Timing Planner
- 1Enter the number of slides and the total duration in seconds.
- 2Set the transition length per cut in milliseconds (default 500).
- 3Choose equal holds or weighted-by-text — text-heavy slides get more time.
- 4For weighted-by-text, enter comma-separated character counts, one per slide.
- 5Copy the timeline: each slide's start and end in milliseconds plus its outgoing transition.
- 6Read the totals check — the plan always sums to your total exactly.
What can you do with Slideshow Timing Planner?
- Photo slideshow duration planner — Time your slideshow perfectly: enter your slide count and total duration in seconds for a start/end timeline with transitions and smart holds.
- Image video timing planner — Time your slideshow perfectly: enter your slide count and total duration in seconds for a start/end timeline with transitions and smart holds.
- Slideshow transition timing — Time your slideshow perfectly: enter your slide count and total duration in seconds for a start/end timeline with transitions and smart holds.
Good to know
- Non-overlapping model: sum(holds) + transitions = total; cross-dissolves that overlap holds are not modeled.
- The transition must be shorter than each slide's hold — otherwise the tool errors.
- Weighted-by-text needs exactly one character count per slide; empty slides get a minimum weight of 10.
- Holds under 1.5s raise a readability note but are still planned.
- Output is a timing plan only — no media rendering, and holds exclude export time.
How it works
Pure arithmetic, never AI: the tool subtracts all transitions from the total (non-overlapping model), then divides the remaining hold time equally or proportionally to per-slide character counts (minimum weight 10 so empty slides still get a beat). Milliseconds are allocated with the largest-remainder method so the timeline always sums to the total exactly. Output is a timing plan — no media is rendered, and holds exclude export time.
Examples
2,000ms per slide with 500ms transitions — each hold stays above the 1.5s readability line.
The 100-character slide gets the longest hold automatically.
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