RICE Prioritization Calculator
What RICE score follows from my reach, impact, confidence and effort estimates? Check the formula, a worked example and the stated measurement limits.
Result for the values shown.
Calculations run in your browser.
What to enter
| Input | Meaning and units |
|---|---|
| Reach in chosen period (people/period) | Enter reach in chosen period in people/period. Use the measurement basis described below. |
| Impact score (score) | Enter impact score in score. Use the measurement basis described below. |
| Confidence (%) | Enter percentage units: 80 means 80%, not 0.8. |
| Total effort (person-months) | Enter total effort in person-months. Use the measurement basis described below. |
Understanding your result
Use scores as a discussion aid alongside dependencies, strategy and evidence. A numerical ranking cannot determine the right roadmap by itself.
Common mistakes
- Treating 80% confidence as 80 instead of 0.8 multiplies the score by 100.
- Changing reach periods between ideas makes comparisons misleading.
Check your calculation
- Use the worked example as a known reference case, then change one input at a time and check the direction and units of the response.
Choose a consistent measurement basis
Choose one reach period and consistent impact scale across ideas. Include effort from all contributors in the same person-month unit; confidence 80 means 80%.
A second independently worked case
Zero assigned confidence gives score zero regardless of reach and impact. Inputs: Reach in chosen period: 1000 people/period; Impact score: 2 score; Confidence: 0 %; Total effort: 4 person-months. Results: RICE score: 0 score.
Precision and output units
Displayed results: RICE score in score, rounded to 3 decimal places. Display rounding does not establish the precision of the original measurements or estimates.
Calculation checks, sources and review limits
What RICE score follows from my reach, impact, confidence and effort estimates?
What RICE score follows from my reach, impact, confidence and effort estimates? Check the formula, a worked example and the stated measurement limits.
Common uses
- What RICE score follows from my reach, impact, confidence and effort estimates
- Compare RICE Prioritization across scenarios under matching definitions.
How it works
Multiply reach, impact and confidence as a fraction, then divide by positive total effort. The arithmetic follows RICE; estimating its inputs remains a team judgment.
Worked example
1,000 × 2 × 0.80 ÷ 4 = 400. Enter reach in chosen period 1000 people/period, impact score 2 score, confidence 80 %, total effort 4 person-months. The independently worked result is rice score 400 score. Compare this example with your reporting definitions before substituting your own figures.
FAQ
Is confidence a statistical probability?
Here it is a prioritization weight assigned using the team’s evidence convention. It is not a calibrated probability of success or a statistical confidence interval.
Are person-months the same as calendar months?
No. Two people each working one month contribute approximately two person-months of effort, even when the calendar duration is one month. Include effort from all relevant contributors.