Calculator Inputs
Large screens use 3 columns, medium screens use 2, and mobile uses 1.Plotly Graph
The chart updates after you submit the calculator.
Example Data Table
| Scenario | Study label | Inputs | Illustrative output |
|---|---|---|---|
| Geographic route | Arctic tern migration | Barrow to Ross Sea, 18% route adjustment, 420 km/day | Adjusted route distance and estimated travel time |
| Speed and duration | Monarch butterfly tracking | 45 km/day for 12 days | Total migration distance across observation period |
| Gel electrophoresis | DNA band lane | Sample 32 mm, dye front 48 mm, lane 60 mm | Migration distance, Rf value, and lane use |
Formula Used
1) Geographic straight-line distance
The geographic mode uses the haversine equation, which measures great-circle distance between two latitude and longitude points on Earth.
d = 2R × asin( √( sin²((φ₂−φ₁)/2) + cos(φ₁) × cos(φ₂) × sin²((λ₂−λ₁)/2) ) )
2) Adjusted route distance
Biological migration paths are rarely perfectly straight. A route adjustment percentage expands the straight-line value to approximate detours, currents, wind drift, habitat barriers, or route curvature.
Adjusted distance = straight-line distance × (1 + adjustment% / 100)
3) Speed and duration
When you already know average speed and travel time, the calculator applies the direct motion relationship.
Distance = speed × time
4) Gel electrophoresis relative mobility
For lab migration work, the tool reports band movement and its position relative to the dye front.
Rf = sample migration distance / dye front distance
How to Use This Calculator
- Choose a calculation mode: geographic route, speed and duration, or gel electrophoresis.
- Enter a species or study label so exports remain easy to identify.
- Fill in the required inputs for the chosen method only.
- Set decimal precision and your preferred output units.
- Click Calculate Migration Distance to place the result below the header and above the form.
- Review the summary table and the Plotly chart.
- Use the CSV or PDF buttons to export the calculated report.
- Repeat with new scenarios to compare migration estimates across studies or lab runs.
FAQs
1) What does this calculator measure?
It estimates migration distance in three biology-oriented ways: geographic path distance, distance from speed and duration, and lab migration distance for gel electrophoresis work.
2) Why is there a route adjustment option?
Animals rarely move in perfect straight lines. The adjustment factor helps approximate more realistic paths affected by terrain, climate, water flow, feeding stops, or navigation behavior.
3) When should I use the speed mode?
Use it when you already have average speed and duration from field observations, telemetry, or published movement rates, and only need the resulting travel distance.
4) What is Rf in the gel mode?
Rf is relative mobility. It compares how far a sample band moved relative to the dye front, which helps standardize migration results across lanes and runs.
5) Can I use this for birds, fish, mammals, and insects?
Yes. The geographic and speed-based modes are flexible enough for many organisms, provided your coordinate, timing, and speed assumptions are appropriate.
6) Does the geographic mode follow roads or exact flyways?
No. It starts with a great-circle estimate and then optionally enlarges that result with a route adjustment percentage to better reflect likely movement complexity.
7) Why export CSV or PDF?
CSV works well for spreadsheets and datasets, while PDF is useful for teaching notes, field summaries, lab records, and quick report sharing.
8) Can I compare multiple studies with this page?
Yes. Run the calculator repeatedly with different labels and settings, then export each result to build a structured comparison set for later analysis.