Least-squares line, parabola, exponential, geometric, and power curve fitting with full equation tables.
| i | x | y | Action |
|---|---|---|---|
| 1 | |||
| 2 | |||
| 3 | |||
| 4 | |||
| 5 |
| x | 0 | 5 | 10 | 15 | 20 |
|---|---|---|---|---|---|
| y | 7 | 11 | 16 | 20 | 26 |
| x | y | xy | x² |
|---|---|---|---|
| 0 | 7 | 0 | 0 |
| 5 | 11 | 55 | 25 |
| 10 | 16 | 160 | 100 |
| 15 | 20 | 300 | 225 |
| 20 | 26 | 520 | 400 |
| Σx = 50 | Σy = 80 | Σxy = 1035 | Σx² = 750 |
| 750 | 50 | 1035 |
| 50 | 5 | 80 |
| 1 | 0.0667 | 1.38 |
| 50 | 5 | 80 |
| 1 | 0.0667 | 1.38 |
| 0 | 1.6667 | 11 |
| 1 | 0.0667 | 1.38 |
| 0 | 1 | 6.6 |
| 1 | 0 | 0.94 |
| 0 | 1 | 6.6 |
| 1 | 0 | 0.94 |
| 0 | 1 | 6.6 |
| x | observed y | fitted y | residual | residual² |
|---|---|---|---|---|
| 0 | 7 | 6.6 | 0.4 | 0.16 |
| 5 | 11 | 11.3 | -0.3 | 0.09 |
| 10 | 16 | 16 | 0 | 0 |
| 15 | 20 | 20.7 | -0.7 | 0.49 |
| 20 | 26 | 25.4 | 0.6 | 0.36 |
| Σ residual² | 1.1 | |||
Residual is observed y - fitted y. Smaller SSE/RMSE means a closer least-squares fit for the selected model.
Tip: use samples, upload, copy, download, and send-to actions inside the workspace where available.
Curve Fitting Calculator is a free, browser-based tool that helps you get the job done quickly. Least-squares line, parabola, exponential, geometric, and power curve fitting with full equation tables. It's built for speed and privacy: Everything runs locally in your browser — your data is never uploaded to a server. No sign-up, no installs, and no daily limits.
Goal: calculate a curve fitting calculator result Values: sample amount, rate, and time period
The calculator shows the final value, intermediate figures, and any percentage or difference used in the result.
A small input for Curve Fitting Calculator
A focused result you can review before copying or downloading.
Input with changed settings or options
The output updates to match your selected options.
A value you want to double-check before using elsewhere
The result gives you a safer handoff into the next task.
Input prepared by another DataXForge tool
The output can be copied, downloaded, or used in another browser workflow.
Use this tool as the focused step in a larger browser-based workflow.
Review the preview, copy or download the result, and keep everything local in your browser.
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