A web-based estimation tool that helps you make better back-of-the-napkin calculations using confidence intervals and Monte Carlo simulation. Perfect for market sizing, forecasting, and numerical estimations.
- Input multiple variables with confidence intervals (ranges)
- Support for K/M/B/T suffixes and percentage values
- Monte Carlo simulation for accurate probability distributions
- Configurable confidence intervals (50%, 80%, 90%, 95%)
- Visual distribution graph
- Detailed percentile breakdown
- Share your calculations with others
- Random estimation questions for practice
- Enter a title for your estimation
- Add variables with their estimated ranges (e.g.,
50M~55M) - Write your formula using the variable names
- Click "Estimate" to see the results
- Adjust confidence intervals to see different probability ranges
- Share your calculation with others using the share button
- Simple numbers:
123,1.23 - Ranges:
100~200,1.1~1.5 - Suffixes:
K(thousands),M(millions),B(billions),T(trillions) - Percentages:
5%,10%~15% - Negative values:
-100,-50~-30
MIT License