Turnout Percentage Calculator

Work out turnout percentage instantly with clear inputs, formula shown and shareable results.

About Turnout Percentage Calculator

Turnout is votes polled as a percentage of registered electors. The invalid vote rate is worth watching alongside it: a rising rate can indicate ballot design problems, deliberate protest voting, or confusion introduced by a change in voting procedure.

Formulas

Turnout

Turnout % = Votes polled / Registered electors x 100

Invalid rate

Invalid % = Invalid votes / Votes polled x 100

Worked example

With the default values below, Turnout Percentage Calculator returns Voter turnout of 67.03%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Votes polled: 1,240,000
Registered electors: 1,850,000
Invalid or rejected votes: 18,500
Previous election turnout: 64.8

Results

Voter turnout: 67.03%
Valid votes counted: 1,221,500
Invalid vote rate: 1.492%
Change from the previous election: 2.23%

Step by step

1Values used
2Turnout
3Invalid rate
4Voter turnout= 67.03
5Valid votes counted= 1,221,500
6Invalid vote rate= 1.492
7Change from the previous election= 2.23

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Indicative estimate only. Fees, entitlements, limits and formulas vary by jurisdiction, statute, policy wording and the facts of the case. This is not legal, tax, insurance or financial advice — confirm with a qualified professional or the relevant authority.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Indicative estimate only. Fees, entitlements, limits and formulas vary by jurisdiction, statute, policy wording and the facts of the case. This is not legal, tax, insurance or financial advice — confirm with a qualified professional or the relevant authority.

Frequently Asked Questions

Should turnout use registered electors or voting-age population?

Registered electors is the standard official measure. Voting-age population turnout is lower and better for cross-country comparison where registration rates differ.

Why do invalid vote rates vary so much?

Ballot complexity, literacy, the presence of a none-of-the-above option, and whether voting is compulsory all influence the rate substantially.