KPI weighting explained
A weighted scorecard turns several performance measures into one bonus multiplier. The maths takes a minute to learn; the design decisions behind the weights are what decide whether the plan changes anyone’s behaviour.
Reviewed 20 August 2026 · gross estimates, not payroll or tax advice
How weighting works
Short answer
KPI weighting splits a bonus across several measures, so each one contributes a fixed share of the payout. Weights must add to 100%. Each KPI is scored as a percentage of its goal, multiplied by its weight, and the results are summed into a single payout factor that is then applied to the target bonus.
| KPI | Weight | Goal | Actual | Score | Contribution |
|---|---|---|---|---|---|
| Revenue | 40% | $5.0m | $5.4m | 108% | 43.2% |
| Gross margin | 30% | 42% | 40% | 95% | 28.5% |
| Customer retention | 20% | 90% | 93% | 103% | 20.6% |
| Project delivery | 10% | 4 launches | 3 | 75% | 7.5% |
| Total | 100% | 99.8% |
On a $15,000 target that is $14,970. A mixed year with one clear miss and two beats lands almost exactly at target — which is what a well-built scorecard is designed to do.
How many KPIs is too many
The most common design fault is not bad weights. It is too many of them.
| Number of KPIs | Smallest meaningful weight | Effect |
|---|---|---|
| 2–3 | 25–30% | Every measure clearly matters. Risk: narrow focus, gaming. |
| 4–5 | 15–20% | The practical sweet spot for most roles. |
| 6–8 | ~10% | Individual measures stop influencing behaviour. |
| 9+ | <10% | Effectively a participation award. Scores average toward 100%. |
Setting weights that mean something
Scoring curves matter more than weights
Two scorecards with identical weights can pay very differently, because the way a result converts to a score is a separate design decision.
| Curve | Behaviour | Result at 90% of goal |
|---|---|---|
| Linear, no threshold | Score equals result | 90% |
| Linear with 80% threshold | Zero below threshold, then linear to target | 50% |
| Stepped bands | Fixed scores per band | 75% (the “90–95%” band) |
| Threshold / target / stretch | Three anchor points, interpolated between | 50–60% depending on anchors |
The same 90% result scores anywhere from 50% to 90% depending purely on curve design. When someone says their bonus “felt arbitrary”, the curve is usually the reason — not the weights.
See the payout curve guide for how threshold, target and stretch anchors work.
Five weighting mistakes
Frequently asked questions
What is KPI weighting?
Splitting a bonus across several performance measures so that each contributes a fixed percentage of the payout. Weights must add up to 100%. Each KPI is scored against its goal, multiplied by its weight, and the weighted scores are summed into one payout factor.
How do you calculate a weighted bonus score?
Score each KPI as a percentage of its goal, multiply each score by its weight, then add the results. A 108% score at 40% weight contributes 43.2%. The sum of all contributions is the payout factor applied to the target bonus.
How many KPIs should a bonus scorecard have?
Four or five is the practical maximum. Beyond that, individual weights fall below 15% and stop influencing behaviour, because moving a 5%-weighted measure is worth a few hundred dollars on a typical target bonus.
Can KPI weights add up to more than 100%?
They should not. If they do, the scorecard pays above target for average performance, which is almost always an editing error rather than a design choice. Check the weights sum to exactly 100% before the period starts.
Why did a good year produce an average bonus?
Weighted scorecards are designed to average out. A strong result on one measure is offset by a weak result on another, and the payout factor lands near 100%. This is the intended behaviour, not a fault - it is also why heavily weighted primary measures matter.
Should weights be the same for everyone?
No. Weights should reflect what each role actually controls. A sales manager and a finance manager sharing an identical scorecard means at least one of them is being paid on something they cannot influence.
Related tools and guides
Written and reviewed by the BonusPayCalc editorial team. Every formula on this site is shown on the page that uses it, so you can check it against your own plan document. Figures are gross planning estimates and not payroll, tax, legal or HR advice — see methodology.