Skip to content
Car Battery
Replacement Cost
en

Tool

Car Battery Group Size Finder

Measure your current battery and we'll show the BCI group sizes that match. Always confirm with your owner's manual or the label on your old battery.

Last updated October 2026. By the editorial team.

Find your group size

Check your owner's manual or the label on your current battery first. If you can't read it, measure the battery case.

Allows for measuring error. Our default, not a standard.

Enter all three measurements.

How to use this tool

  1. 1. Measure the battery

    Length, width and height of the case.

  2. 2. Enter in mm or inches

    Set a tolerance to allow for measuring error.

  3. 3. See matching groups

    We list BCI groups with sizes close to yours.

  4. 4. Confirm

    Check terminal position and your owner's manual.

Reference Sizes

BCI group sizes
GroupLength × width × height
34260 × 173 × 200 mm
35230 × 175 × 225 mm
47Still checking
48278 × 175 × 190 mm
49353 × 175 × 190 mm
51238 × 129 × 223 mm
65306 × 192 × 192 mm
75Still checking
78Still checking
24F273 × 173 × 229 mm
51R238 × 129 × 223 mm
94R315 × 175 × 190 mm

Source: Vatrer Power BCI size guide (third-party), checked October 2026. The BCI Battery Replacement Data Book is the authority. Groups 47, 75 and 78 are still being checked.

Official Retailer Lookups

For a match by vehicle, use the retailer's own lookup. We link, we don't scrape.

Once you know the size, compare prices on the price comparison.

Frequently asked questions

What is a BCI group size?

A Battery Council International group number describes the battery case size and terminal layout so it fits your tray and cables. It does not tell you capacity, CCA or chemistry.

Why does the finder show several matches?

Some groups are close in size or share a case (51 and 51R are the same size with reversed terminals). Check terminal position and your manual to pick the right one.

Do you have a vehicle lookup?

No. We do not build or scrape a vehicle database. Use the official lookups at Walmart, AutoZone, Advance, O'Reilly or Interstate, and always check your owner's manual or the old battery label.

Related tools and guides