Features Overview
The Interpolation.net Excel Add-in brings powerful numerical methods to your spreadsheets.
Core Interpolation Methods
Linear Interpolation
- Fast and reliable
- Works with any dataset
- O(log n) lookup performance
Cubic Spline Interpolation
- Smooth C² continuous curves
- Natural or clamped boundary conditions
- Industry-standard algorithm
Polynomial Interpolation
- Exact fit through all points
- Supports arbitrary degree
- Useful for analytical work
Excel Integration
✅ Native Excel functions
✅ Works with ranges and arrays
✅ Supports dynamic arrays (Excel 365)
✅ Integrates with existing formulas
✅ Full formula auditing support
Performance
- Optimized C# implementation
- Handles thousands of points
- Minimal memory footprint
- Fast recalculation
Data Handling
- Sorted and unsorted data
- Missing value handling
- Duplicate detection
- Error validation
Compatibility
- Excel 2010, 2013, 2016, 2019, 365
- Windows 7, 8, 10, 11
- 32-bit and 64-bit Excel
- .NET Framework 4.6.2+
Coming Soon
- 2D interpolation (bilinear, bicubic)
- Extrapolation options
- Data smoothing
- Derivative calculations
- Custom boundary conditions
Learn more: