How to Randomly Assign People to Equal-Sized Groups
To randomly assign people to equal-sized groups, shuffle the confirmed roster once and split the order into equal consecutive blocks. With 24 people and groups of 6, the first 6 shuffled names form group 1 through the final 6 names in group 4; each group has exactly 6 members.
A worked example with numbers
Twenty-four participants need four groups of six. After one shuffle, positions 1–6 become group 1, 7–12 group 2, 13–18 group 3, and 19–24 group 4. Every participant appears once, and each group has six people. With 22 people, four groups of six are impossible because 22 ÷ 6 leaves a remainder of 4; decide whether to use groups 6, 6, 5, 5 or change the group count before shuffling.
How to set the rule before the result
Use the group generator for a stated group size, or shuffle a roster and slice the visible order manually. Record exclusions and the uneven-group rule before the first output.
Common mistakes that change the odds or the process
Do not claim equal-sized groups when the headcount is not divisible by the chosen size. Do not rebalance people after the result to improve perceived skill while still calling the outcome purely random. Do not hide a duplicate roster row.
Where this method stops being appropriate
Equal size is not equal ability, experience, accessibility, or safety. Use a balanced-team method when stated levels must affect allocation; that is a different goal from equal random odds.
How the random source fits into the rule
NIST’s hypergeometric-distribution glossary
Apply the rule to the actual input
Use the group generator for a stated group size, or shuffle a roster and slice the visible order manually. Record exclusions and the uneven-group rule before the first output.
Audit the calculation or allocation
Twenty-four participants need four groups of six. After one shuffle, positions 1–6 become group 1, 7–12 group 2, 13–18 group 3, and 19–24 group 4. Every participant appears once, and each group has six people. With 22 people, four groups of six are impossible because 22 ÷ 6 leaves a remainder of 4; decide whether to use groups 6, 6, 5, 5 or change the group count before shuffling.
Do not import a different rule by accident
Do not claim equal-sized groups when the headcount is not divisible by the chosen size. Do not rebalance people after the result to improve perceived skill while still calling the outcome purely random. Do not hide a duplicate roster row.
Limit of this specific method
Equal size is not equal ability, experience, accessibility, or safety. Use a balanced-team method when stated levels must affect allocation; that is a different goal from equal random odds.
Source and reproducibility
NIST’s hypergeometric-distribution glossary
Choose a size that divides the roster
| Participants | Requested size | Possible equal groups |
|---|---|---|
| 24 | 6 | 4 groups of 6 |
| 20 | 5 | 4 groups of 5 |
| 22 | 6 | Not exact; remainder 4 |
Division is an operational check before the shuffle, not an afterthought. With 22 people, an announced 6, 6, 5, 5 split is honest but no longer equal-sized. The labels of groups can be assigned before or after slicing; changing a person between blocks after the result changes the allocation.
Separate equal size from balance
Four groups of six can have equal headcount and very different experience totals. If experience matters, define how it is measured, who checks it, and whether a level-based balancing rule is allowed. Random grouping remains useful when equal opportunity and fast allocation are the goal. It should not be presented as proof that every group can perform equally well or safely without supervision.
Reproduce this result before relying on it
Equal-sized random grouping is a uniform random order followed by fixed-size consecutive blocks. Twenty-four participants need four groups of six. After one shuffle, positions 1–6 become group 1, 7–12 group 2, 13–18 group 3, and 19–24 group 4. Every participant appears once, and each group has six people. With 22 people, four groups of six are impossible because 22 ÷ 6 leaves a remainder of 4; decide whether to use groups 6, 6, 5, 5 or change the group count before shuffling.
Choose the action that matches the stated rule
Use the group generator for a stated group size, or shuffle a roster and slice the visible order manually. Record exclusions and the uneven-group rule before the first output. Do not claim equal-sized groups when the headcount is not divisible by the chosen size. Do not rebalance people after the result to improve perceived skill while still calling the outcome purely random. Do not hide a duplicate roster row.
What the number does not decide
Equal size is not equal ability, experience, accessibility, or safety. Use a balanced-team method when stated levels must affect allocation; that is a different goal from equal random odds. NIST’s hypergeometric-distribution glossary
State the complete decision model
To randomly assign people to equal-sized groups, shuffle the confirmed roster once and split the order into equal consecutive blocks. With 24 people and groups of 6, the first 6 shuffled names form group 1 through the final 6 names in group 4; each group has exactly 6 members. Equal-sized random grouping is a uniform random order followed by fixed-size consecutive blocks.
Before publishing or using the outcome
Twenty-four participants need four groups of six. After one shuffle, positions 1–6 become group 1, 7–12 group 2, 13–18 group 3, and 19–24 group 4. Every participant appears once, and each group has six people. With 22 people, four groups of six are impossible because 22 ÷ 6 leaves a remainder of 4; decide whether to use groups 6, 6, 5, 5 or change the group count before shuffling. Use the group generator for a stated group size, or shuffle a roster and slice the visible order manually. Record exclusions and the uneven-group rule before the first output.
Final rule check for this allocation
To randomly assign people to equal-sized groups, shuffle the confirmed roster once and split the order into equal consecutive blocks. With 24 people and groups of 6, the first 6 shuffled names form group 1 through the final 6 names in group 4; each group has exactly 6 members. Equal-sized random grouping is a uniform random order followed by fixed-size consecutive blocks. Equal size is not equal ability, experience, accessibility, or safety. Use a balanced-team method when stated levels must affect allocation; that is a different goal from equal random odds.