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Docker Push Time Calculator

Estimate docker push duration to a registry based on image size and upload speed.

About Docker Push Time Calculator

Docker push only uploads layers not already present in the registry. Push time = (compressedSize × layersToUpload/totalLayers) / uploadBandwidth + overhead. Keeping shared base layers constant means only your application layer changes need uploading.

Formula

Push Time

pushTime = (imageSize × newLayers / totalLayers) / (uploadBandwidth / 8) + overhead

imageSize
Compressed image size in MB
newLayers
Layers not yet in registry
uploadBandwidth
Upload bandwidth in Mbps

Worked example

With the default values below, Docker Push Time Calculator returns Estimated Push Time of 19.7. Change any input above and every figure here is recalculated in your browser.

Inputs used

Compressed Image Sizeaccepts 1–100,000 MB
250 MB
Upload Bandwidthaccepts 1–100,000 Mbps
50 Mbps
Layers to Uploadaccepts 1–200 layers
5 layers
Total Layersaccepts 1–200 layers
12 layers

Results

Estimated Push Time
19.7 seconds
Push Time
0.33 minutes
Data to Upload
104.2 MB
Skipped (already in registry)
7 layers

Step by step

  1. 1Data to upload= 104.2MB
  2. 2Upload time + overhead= 19.7s

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why is push sometimes faster than pull?

Pushes benefit greatly from layer deduplication — if most layers already exist in the registry from previous pushes, only the changed layers need uploading, which can be a tiny fraction of the total image.

How does a CI pipeline affect push time?

CI runners often have high-bandwidth connections to nearby registries (same cloud region), and using layer caching in CI means incremental builds push only 1-2 changed layers.

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