RTMP Bitrate Calculator

Calculation mode

Estimate uses bits-per-pixel presets. Custom uses your exact values.

Rate control

VBR can spike above average; the calculator accounts for peaks.

VBR peak factor

Common range: 1.15 to 1.50. Higher means larger bursts.

Width (px)

Height (px)

Frames per second

Codec

Quality preset

Motion level

Audio bitrate (kbps)

Typical: 96–160 kbps for stereo music/voice.

Custom video bitrate (kbps)

Custom audio bitrate (kbps)

Protocol overhead (%)

Accounts for mux framing + protocol packaging.

Network headroom (%)

Extra buffer for Wi‑Fi, mobile, congestion, and routing swings.

Keyframe interval (seconds)

Common ingest guidance: 2 seconds.

RTMP chunk size (KB)

Smaller chunks can add overhead on noisy links.

Reset

Bits-per-pixel presets used in Estimate mode

Codec	Low	Medium	High	Motion multipliers
H.264	0.07	0.10	0.14	0.85 / 1.00 / 1.20
H.265	0.05	0.075	0.105	0.85 / 1.00 / 1.20
AV1	0.045	0.065	0.090	0.85 / 1.00 / 1.20

Scenario	Resolution	FPS	Codec	Video kbps	Audio kbps	Overhead	Upload Mbps
Talk show	1280×720	30	H.264	2500	128	10%	3.80
Gaming	1920×1080	60	H.264	6000	160	10%	9.10
Sports	1920×1080	60	H.265	4500	160	12%	7.90

These are illustrative targets. Always confirm ingest limits and your actual upload stability.

Estimate mode Video bitrate is calculated using a bits‑per‑pixel model:

VideoBitrate(bps) = Width × Height × FPS × BPP × MotionMultiplier

Then audio is added, protocol overhead is applied, and optional VBR peaks and network headroom are included:

Payload = Video + Audio
Total = Payload × (1 + Overhead%)
Peak = Total × PeakFactor (VBR only)
RecommendedUpload = Peak × (1 + Headroom%)

Select Estimate for quick planning, or Custom if you already know your bitrates.
Set codec, quality, motion, and audio bitrate for your content type.
Choose CBR for steady output or VBR if your encoder spikes.
Add overhead and headroom to match real network conditions.
Press Calculate to view results above the form.
Use the download buttons to export CSV or PDF.

1) What does RTMP bitrate represent?

It is the average amount of data your encoder sends per second for video and audio. Higher values can improve quality, but only if your upload link and the ingest server can sustain it reliably.

2) Why do you add protocol overhead?

Streaming adds packaging, mux framing, and transport-related bytes. Overhead varies by settings and conditions, so a small percentage helps prevent underestimating total throughput.

3) How much network headroom should I use?

For stable wired links, 10–20% can work. For Wi‑Fi, mobile, or congested networks, 25–40% is safer. Headroom reduces the risk of buffering when upload speed fluctuates.

4) What is the difference between CBR and VBR here?

CBR targets a steady rate, so peak equals total. VBR can spike during complex scenes, so the calculator multiplies by a peak factor. If you see drops, lower peak factor or increase headroom.

5) Do codecs change the recommended bitrate?

Yes. More efficient codecs can achieve similar quality at lower bitrates, depending on your encoder settings and platform support. The estimate mode reflects this by using different bits‑per‑pixel presets.

6) Does keyframe interval affect bitrate?

It can. Frequent keyframes may increase bursts and reduce compression efficiency. This tool adds a small overhead adjustment for very short intervals as a planning safeguard, but your encoder and content still matter.

7) Why is recommended upload higher than total bitrate?

Total bitrate is the stream itself. Recommended upload includes possible peaks (VBR) and extra margin (headroom). The margin helps keep the stream smooth when your real upload speed is inconsistent.

8) How accurate is the estimate mode?

It is a planning model, not a guarantee. Real results vary by encoder preset, scene complexity, and platform limits. Use it to pick a safe starting point, then validate with real test streams.

RTMP Bitrate Calculator