What Frame Rate Should I Use for Slow Motion Video?

Start with the duration you want, not the biggest frame-rate number

The useful answer to “what frame rate should I use for slow motion?” is a division problem:

slow-motion factor = shooting frame rate ÷ playback frame rate.

That is the whole system. Once you know the delivery frame rate of the timeline, choose a capture frame rate that gives the amount of duration you need. [2][3]

A second of real action shot at 120fps contains 120 separate frames. Put those frames on a 24fps timeline, show every captured frame once, and that one real second lasts five seconds. On a 30fps timeline, the same second lasts four seconds. The camera did not change. The timeline did.

That distinction is where a lot of slow-motion advice goes wrong. “Shoot 120fps for 4x slow motion” is true only when the finished programme plays at 30fps. In a 24fps project, 120fps is 5x slow motion. If you cut both 24fps and 30fps deliverables, do not plan around a vague label such as “four times slow.” Plan around the exact timeline you will actually finish.

For most work, the question is not “what is the highest frame rate this camera offers?” It is: how long should this moment last after I slow it down?

A hand entering frame, a runner’s foot strike, steam lifting off food, a glass breaking, a reaction shot: each needs a different answer. The right capture rate is the lowest one that gives you the duration and motion detail the edit needs. That choice saves light, image quality, card space, transfer time and often a lot of frustration.

The number sets the edit

Say you are cutting a 24fps project, whether that is a narrative piece, a commercial master or an online film deliberately finished at 24fps.

Here is what common capture rates become:

Shooting frame rate	Playback frame rate	Slow-motion factor	One second of action becomes
60fps	24fps	2.5x	2.5 seconds
120fps	24fps	5x	5 seconds
240fps	24fps	10x	10 seconds

Those are simple capture-to-playback ratios. [2][3]

For a 30fps project, the familiar equivalents are different:

Shooting frame rate	Playback frame rate	Slow-motion factor	One second of action becomes
60fps	30fps	2x	2 seconds
120fps	30fps	4x	4 seconds
240fps	30fps	8x	8 seconds

Again, the ratios are determined by the delivery frame rate, not by the marketing name of the recording mode. [2][3]

If you want a modest, natural extension of action in a 24fps edit, 60fps is often the sensible starting point. It gives 2.5x slow motion, enough to let a gesture breathe without turning every move into a heroic moment. For 30fps projects, 60fps gives the conventional 2x result. [10][11]

If you know you need a clearly stylised hold on movement, 120fps is the more useful planning number. It yields 5x in a 24fps timeline and 4x in a 30fps timeline. That is usually enough for a quick action to become an editable shot rather than a blink-and-you-miss-it insert. Recommendations commonly put 60fps and 120fps at the practical centre of ordinary slow-motion work for exactly this reason. [9][10]

The key word is “need.” Shooting 120fps because the camera can do it is not neutral. It changes the way you have to expose, and it may reduce image quality depending on the camera and mode.

Why 120fps costs more than five times the frames

Frame rate determines more than playback duration. It also shortens the time available to expose each frame.

Using the common 180-degree shutter convention, a 24fps shot uses roughly a 1/48-second exposure. At 120fps, the corresponding shutter speed is roughly 1/240 second. Each frame gets one fifth as much exposure time.

That means 120fps needs about five times as much light as 24fps for the same aperture and ISO, which is approximately 2.3 stops. [9][10]

This is why a slow-motion shot that looked fine at 24fps can suddenly become noisy, underexposed or both when you switch to 120fps. It is not usually a mysterious codec issue and it is not automatically a reason to buy a different camera. The exposure time just became five times shorter.

There are only a few ways to pay that bill:

Add more light.
Open the aperture.
Raise ISO or gain.
Accept a darker image.
Reduce the shooting frame rate.

The first option is generally the cleanest, though it is not always available. The second affects depth of field. The third can expose the sensor’s noise limits, especially in shadows. The fifth is often the edit-friendly decision: if 60fps already gives the duration the shot needs, 120fps has imposed a cost without buying anything useful.

This is particularly important when matching normal-speed and slow-motion material in the same scene. A 24fps shot at 180 degrees might be 1/48, while the 120fps coverage is 1/240. Motion blur will be materially different even if colour, lens and exposure level match. That cleaner, sharper per-frame movement is part of the slow-motion look, but it can also make a 120fps insert feel detached from surrounding footage if it is used casually.

Do not solve this by leaving the shutter at 1/48 while shooting 120fps just to recover exposure. That creates much heavier motion blur per frame. Once slowed down, the result can look smeary rather than fluid. Slow-motion guidance regularly flags inappropriate shutter settings as a common cause of poor results. [9][16]

Pick the timeline standard before you shoot

The same principle explains a quiet regional divide.

In 30fps-oriented NTSC workflows, 60fps capture is a clean 2x slow-motion choice. In 25fps PAL workflows, 50fps capture is the equivalent clean 2x choice. The underlying idea is identical: shoot at double the intended playback rate. [11][14]

A project finished at 25fps therefore has its own useful ladder:

50fps gives 2x slow motion.
100fps gives 4x slow motion.
200fps gives 8x slow motion.

The numbers matter because “60fps slow motion” is not universally neat. At 25fps, 60fps does not divide evenly. An NLE must either interpret the timing in a way that changes duration, discard frames, duplicate frames or apply some form of conversion, depending on the settings and intended result. Mixing rates is possible, but it is a choice with consequences, not an automatic workflow. Guidance on frame-rate conversion consistently warns against mixing material without deciding how it will be conformed. [3][14][16]

Before a shoot, write down one line in the camera plan:

Master timeline: 24, 25 or 30fps. Slow-motion capture: 60, 100 or 120fps as required.

That line prevents the expensive version of this problem, where someone shoots an entire day at 60fps assuming “half speed,” then discovers the master is 24fps and every shot is 2.5x slow if played frame-for-frame.

What “conform” actually means in the edit

When a clip is properly conformed for slow motion, the editor tells the NLE to play each recorded frame at the timeline rate.

A 120fps file conformed to 24fps does not need invented frames. Its 120 real captured frames fill five seconds of a 24fps timeline. The motion is smooth because each output frame comes from an actual frame recorded by the camera.

That is different from taking a 24fps clip and slowing it to 20 percent. At that point, the editor has only 24 source frames for every second of real action but needs 120 timeline frames to make five seconds at 24fps. The NLE can repeat frames, which looks choppy, or attempt optical flow or AI interpolation, which generates intermediate images based on motion estimates.

Interpolation can be useful for a shot you cannot reshoot, but it is not equivalent to high-frame-rate capture. Current research into frame interpolation focuses on improving consistency and reducing generated-frame errors, which tells you the limitation is still real, especially around occlusions, fast movement and changing shapes. [1] Treat interpolation as repair work, not the plan for a shot whose main purpose is slow motion.

The exact commands vary between NLEs, so do not assume a button called “slow motion” always conforms a clip. In some applications, changing a clip’s interpreted frame rate changes its default duration. In others, a speed setting changes duration on the timeline. Those can produce the same intended result, but the project’s audio handling, retiming mode and export behaviour may differ. This brief does not establish a standard proxy, codec or timeline-performance workflow unique to high-frame-rate material, so it would be wrong to pretend there is one universal setup.

The practical check is simple: put the clip in the timeline and confirm that a one-second 120fps recording becomes five seconds in a 24fps sequence, or four seconds in a 30fps sequence, before editing the whole job.

Why very high frame rates are specialised tools

A 240fps mode can be useful when the action is genuinely too fast for 120fps: a splash, an impact, a rapid mechanical movement or a sports moment where the edit needs to inspect a brief event. At 24fps, it becomes 10x slow motion. At 30fps, it becomes 8x. [2][3]

But 240fps is not simply “better 120fps.” Higher frame-rate modes often reduce resolution, increase noise or limit recording duration. The exact compromise is camera-specific, particularly above 240fps, and broad claims about quality at 480fps or beyond are not well standardised. [5][10]

Consumer and professional cameras now advertise striking top-end numbers. Digital Camera World lists examples including the DJI Osmo Pocket 3 at 120fps in 4K, the Nikon ZR at 240fps in Full HD and the GoPro HERO13 Black at 400fps in 720p. [5] ARRI says its ALEXA 35 Live Xtreme can reach 480fps in Sensor Overdrive mode for live production workflows. [7] Those figures describe capability, not a recommendation that every shot should use those modes.

The format attached to the number matters. If the 400fps mode is 720p and your project needs a 4K crop, stabilisation or reframing, the apparent advantage can disappear. If the high-speed mode costs too much sensitivity for the available light, the shot may be technically slow but visually unusable. Sony’s ZV-1 is often cited for a 960fps option, but extreme consumer modes can come with practical limits such as restricted operation, and very high frame rates are not automatically the right production choice. [5]

The working rule

Choose the frame rate by dividing the capture rate by the final playback rate, then stop as soon as you have enough slow motion.

For a 24fps project:

Choose 60fps when 2.5x is enough.
Choose 120fps when you need 5x.
Choose 240fps only when 10x is genuinely required and you can afford the image and lighting trade-offs.

For a 30fps project:

Choose 60fps for 2x.
Choose 120fps for 4x.
Choose 240fps for 8x.

For a 25fps project, use 50fps for 2x and 100fps for 4x where the camera offers those rates.

Then test the actual camera mode under the actual lighting. Confirm resolution, record limit, shutter speed, noise level and the clip’s duration after conforming in the intended timeline. That is less glamorous than chasing a 960fps badge, but it is the fix that prevents slow motion from becoming an exposure problem, a conversion problem and an editing problem all at once.

Frequently Asked Questions

How do I choose the right frame rate for slow motion?

Start by deciding how long you want the slowed-down moment to last in your final edit rather than picking the highest frame rate your camera offers. Use the formula slow-motion factor = shooting frame rate ÷ playback frame rate to find the capture frame rate that matches your desired duration. Choose the lowest frame rate that provides enough slow-motion duration and motion detail to save light, maintain image quality, and reduce data demands.

What frame rate should I shoot for 4x slow motion?

To achieve 4x slow motion, you need to shoot at four times the playback frame rate. For example, in a 30fps project, shooting at 120fps yields 4x slow motion. However, if your timeline is 24fps, 120fps actually produces about 5x slow motion, so always plan based on your actual playback frame rate.

How does playback frame rate affect slow motion duration?

Playback frame rate determines how long a captured second of action lasts when slowed down. For instance, one second shot at 120fps plays back as 5 seconds at 24fps (5x slow motion) but only 4 seconds at 30fps (4x slow motion). The slow-motion factor depends on dividing the shooting frame rate by the playback frame rate, so different playback rates change the slow-motion duration.

Why does shooting at 120fps require more light?

At 120fps, the exposure time per frame is about one-fifth that of 24fps (roughly 1/240 second versus 1/48 second at a 180-degree shutter angle). This shorter exposure means 120fps needs approximately five times more light—about 2.3 stops more—to maintain the same brightness. Without additional light, images can become noisy or underexposed.

What is the difference between 60fps and 120fps slow motion?

Shooting at 60fps roughly doubles or 2.5 times the duration of action depending on playback rate (2x at 30fps, 2.5x at 24fps), while 120fps doubles that slow-motion effect (4x at 30fps, 5x at 24fps). However, 120fps requires significantly more light due to shorter exposure times and can produce a cleaner, sharper look with less motion blur, which may feel visually different from 60fps footage.

Sources

August 25, 2026

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