Road-ready calculators
Quick answer
Every calculator shows its formula and works in your browser. The two most used: dash cam recording time (card GB x 0.93 x 8,000 / Mbps / 60) and jump starter size (liters x 61 x 2 for diesel, adjusted for cold).
ROVE R2-4K Dual Dash Cam Front and Rear, STARVIS 2 Sensor, Free 128GB Card
4K / 2 channel
The ROVE R2-4K Dual is one of the most bought front and rear dash cams on Amazon.
$149.99Check price on Amazon
All calculators
- Dash cam recording time calculatorHow many hours of dash cam footage fit on a 32GB, 64GB, 128GB or 256GB card at 1080p, 2K or 4K, front only or ...
- Dash cam SD card size calculatorEnter how many hours of driving you want kept and your camera setup, and get the smallest microSD card size th...
- Parking mode battery drain calculatorHow many hours of parking-mode coverage a hardwired dash cam gets from your car battery before the low-voltage...
- Jump starter size calculatorWork out the cranking amps your engine needs by size, cylinders, gas or diesel and temperature, and the jump s...
- Jump starter charges calculatorTurn a jump starter's mAh rating into watt-hours, likely jump attempts per charge, phone charges and how long ...
- Tire inflation time calculatorHow long a portable tire inflator takes to top up or fill a tire, from the tire size, the starting and target ...
- Tire pressure by temperature calculatorHow much tire pressure drops or rises with the outside temperature, using the gas law on absolute pressure, an...
- Battery charge time calculatorHow long a car battery takes to charge from its current voltage or state of charge, by battery amp-hours and c...
Before you rely on this: Researched from published specifications and verified owner reviews, not hands-on testing. General information, not professional advice; check your vehicle manual.