Vanity Fair posted the following chart examining the death toll in all of Quentin Tarantino's films along with the method of each death, be it baseball bat, samurai sword, the Five Point Exploding Heart Technique, dynamite and more.
The films include Reservoir Dogs, Pulp Fiction, Jackie Brown, Kill Bill: Vol. 1, Kill Bill: Vol. 2, Death Proof, Inglourious Basterds and Django Unchained.
With four total kills, Jackie Brown comes in the lightest in the death department while Inglourious Basterds is the overwhelming winner with 396 deaths. Granted, most of those came as a result of the fire at the end of the film, but even without the fire you're looking at 57 kills, which is still enough for third place behind Django Unchained and Kill Bill: Vol. 1.
I've included the chart below, you can give it a click for a much larger version that will be easier to read.