Election Vote Share Calculator

Work out election vote share instantly with clear inputs, formula shown and shareable results.

About Election Vote Share Calculator

Vote share is votes polled as a percentage of total valid votes, excluding rejected ballots. Comparing it with the previous election gives the swing, and comparing it with an even split across all candidates shows how concentrated support is in a fragmented field.

Formulas

Vote share

Share % = Party votes / Total valid votes x 100

Change

Change = Current share - Previous share

Worked example

With the default values below, Election Vote Share Calculator returns Vote share of 36.31%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Votes polled for the party: 428,500
Total valid votes: 1,180,000
Party's previous vote share: 34.2
Candidates contesting: 9

Results

Vote share: 36.31%
Change from the previous election: 2.11%
Lead over an even split: 25.20%
Average votes per candidate: 131,111

Step by step

1Values used
2Vote share
3Change
4Vote share= 36.31
5Change from the previous election= 2.11
6Lead over an even split= 25.20
7Average votes per candidate= 131,111

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 2 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 postal and invalid votes be included?

Postal votes counted as valid are included; rejected and invalid ballots are excluded from the denominator by convention.

Does a higher vote share always mean more seats?

No. In first-past-the-post systems the geographic distribution of votes matters more than the national share.