David Chang, Hawaii’s Republican Party chairman, is estimating that 5,000 to 10,000 voters will turn out for caucuses Tuesday that will determine the candidate who will get 17 of the state’s 20 delegates to the GOP National Convention in Tampa, Fla., this summer.

In previous years, Hawaii Republicans had awarded delegates to candidates at state conventions, but switched to the caucuses this year in hopes of building the party. Roughly 45,000 Republicans voted in the past few GOP primaries, so the caucuses will involve a much smaller pool of voters.

Several Republicans had argued against the caucuses as a waste of the party’s limited resources, but Chang said interest by the presidential campaigns shows the caucuses could be worth the effort.

Republicans will vote between 6 and 8 p.m. Tuesday at locations across the state. Voters must join the party to participate. Caucus locations are listed at www.gop­hawaii.com.