RoadReadyCalc
Reference chart

Dash cam recording time chart

Quick answer

At typical bitrates a 128GB card holds about 22 h 3 min of 1080p front footage, 8 h 16 min of 4K front footage, and 6 h 18 min from a 4K front and 1080p rear camera.

(5 Yrs Free Data Recovery) (Dash Cam) GIGASTONE 256GB Micro SD Card, TLC High Endurance Pro, Speed Up to 100MB/s, Compatible with REDTIGER Rove VIOFO VANTRUE PRUVEEO ARIFAYZ, MicroSDXC UHS-I A1 V30 U3

(5 Yrs Free Data Recovery) (Dash Cam) GIGASTONE 256GB Micro SD Card, TLC High Endurance Pro, Speed Up to...

256GB / high endurance

A mid-range pick from the gear this chart is about. More across the price range below the chart.

$69.99Check price on Amazon

Loop length before overwrite, using 12 Mbps for 1080p, 16 for 2K, 20 for 2.5K, 32 for 4K and 10 Mbps per extra 1080p channel, with 93 percent of the labeled capacity usable. Run your own numbers in the dash cam recording time calculator.

Front camera only
Card1080p2K2.5K4K
16GB2 h 45 min2 h 4 min1 h 39 min1 h 2 min
32GB5 h 31 min4 h 8 min3 h 18 min2 h 4 min
64GB11 h 1 min8 h 16 min6 h 37 min4 h 8 min
128GB22 h 3 min16 h 32 min13 h 14 min8 h 16 min
256GB44 h 5 min33 h 4 min26 h 27 min16 h 32 min
512GB88 h 11 min66 h 8 min52 h 54 min33 h 4 min
Front and rear (1080p rear)
Card1080p2K2.5K4K
16GB1 h 30 min1 h 16 min1 h 6 min47 min
32GB3 h2 h 33 min2 h 12 min1 h 34 min
64GB6 h 1 min5 h 5 min4 h 25 min3 h 9 min
128GB12 h 1 min10 h 10 min8 h 49 min6 h 18 min
256GB24 h 3 min20 h 21 min17 h 38 min12 h 36 min
512GB48 h 6 min40 h 42 min35 h 16 min25 h 12 min
Three channel (1080p rear and cabin)
Card1080p2K2.5K4K
16GB1 h 2 min55 min50 min38 min
32GB2 h 4 min1 h 50 min1 h 39 min1 h 16 min
64GB4 h 8 min3 h 40 min3 h 18 min2 h 33 min
128GB8 h 16 min7 h 21 min6 h 37 min5 h 5 min
256GB16 h 32 min14 h 42 min13 h 14 min10 h 10 min
512GB33 h 4 min29 h 24 min26 h 27 min20 h 21 min

High-endurance cards for these loop lengths

An even spread across the price range. Prices change often.

Before you rely on this: Windshield-mount rules and audio-recording consent laws vary by state, so check your local law. Researched from published specifications and verified owner reviews, not hands-on testing. General information, not professional advice; check your vehicle manual and your local law.

Frequently asked questions

Where do the numbers in this chart come from?

Loop length before overwrite, using 12 Mbps for 1080p, 16 for 2K, 20 for 2.5K, 32 for 4K and 10 Mbps per extra 1080p channel, with 93 percent of the labeled capacity usable. They are calculated, not measured on any one product, so real results vary with the specific model, its settings and its condition. The dash cam recording time calculator runs the same formula on your own inputs.

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Updated 2026-09-24