How many votes do I need to win?
Your win number is half of the expected votes cast plus one. Multiply registered voters by the turnout rate of the last comparable election to get expected votes, divide by two, and add one. Campaigns then set a vote goal above the bare win number, usually 52 percent of expected turnout, so a normal polling error or a late turnout swing does not cost the race. Subtract your current base support from the vote goal and the remainder is the number of voters you still have to identify and persuade.
By Frank Carrasco, PhD, founder of The Political Group, 20+ years and 1,900+ campaigns. Last updated .
Win Number Calculator
Turnout math only. Registration drives, early vote, and turnout swings all move the expected vote; recompute as new data arrives.
The formula
- Expected votes = registered voters x expected turnout rate
- Win number (two-way race) = expected votes / 2, rounded down, plus 1
- Win number (plurality) = expected votes / number of candidates, rounded down, plus 1
- Vote goal = expected votes x 52%
- Votes still to find = vote goal minus (expected votes x base support %)
How to use it
- 1
Find registered voters
Pull the registered voter count for the exact district from the county clerk, secretary of state, or your voter file vendor.
- 2
Pick a comparable turnout rate
Use turnout from the last election of the same type: a 2022 midterm for a 2026 midterm, a spring municipal election for a spring municipal race. Never use a presidential year for a down-ballot race.
- 3
Compute expected votes and the win number
Multiply registered voters by the turnout rate, halve it, and add one. That is the bare majority.
- 4
Set the vote goal and the persuasion universe
Pad the win number to 52 percent of expected turnout, then subtract the votes your base already delivers. The gap is the number of voters the field program must identify and move.
Questions campaigns ask
What is a win number in a political campaign?+
The win number is the minimum number of votes a candidate needs to win: half of the expected votes cast plus one in a two-candidate race, or a plurality plus one when more than two candidates are on the ballot. It is the first number a campaign plan is built around.
Why do campaigns set a vote goal above the win number?+
Turnout projections are estimates. Setting the vote goal at 52 percent of expected votes instead of 50 percent plus one gives the campaign a cushion against polling error, a late surge for an opponent, or higher turnout than projected.
Which turnout rate should I use?+
Use the turnout rate from the most recent election of the same type and level. Midterm turnout is usually 15 to 25 points below presidential turnout, and municipal turnout is lower still, so a mismatched year overstates expected votes and understates how hard the race is.
How does the win number turn into a voter contact plan?+
Subtract base support from the vote goal to get the votes still needed, then divide by your expected persuasion or turnout yield per contact to size the universe. A live phone program that identifies supporters and moves undecideds is how most campaigns close that gap.