
Orbital Period Calculator
Calculate an ideal Keplerian period from semimajor axis and total two-body mass.
Open toolCalculate ideal instantaneous bound-orbit speed using vis-viva. Provide Bound-orbit semimajor axis (m), Instantaneous orbital radius (m), Central mass (kg) to compute results directly in your browser. v=sqrt(G*M*(2/r-1/a)), G=6.67430e-11 SI. Requires r<2a; positive semimajor axis, negligible satellite mass, no orbit-state reconstruction or relativistic correction. Inputs and results use floating-point numbers; output shows up to 12 significant digits. Rounding can occur. Common search workflows supported include "wave orbital velocity calculator", "wave orbital velocity calculator".
Enter the inputs, then select Calculate.
Result will appear here
The Orbital Velocity Calculator evaluates Bound-orbit semimajor axis (m), Instantaneous orbital radius (m), Central mass (kg) in client-side JavaScript using the deterministic rule below and updates the output panel immediately without uploading data to a server.
Calculate ideal instantaneous bound-orbit speed using vis-viva.
v=sqrt(G*M*(2/r-1/a)), G=6.67430e-11 SI. Requires r<2a; positive semimajor axis, negligible satellite mass, no orbit-state reconstruction or relativistic correction. Inputs and results use floating-point numbers; output shows up to 12 significant digits. Rounding can occur.
Review the input parameters, allowed value ranges, and worked reference cases for the Orbital Velocity Calculator below before running your calculation.
| Parameter / Scenario | Default / Sample Value | Rule or Allowed Range | Output / Usage Note |
|---|---|---|---|
| Input: Bound-orbit semimajor axis (m) | 7000000 | Range: 1e-09 to 1e+100 | Required workspace parameter |
| Input: Instantaneous orbital radius (m) | 7000000 | Range: 1e-09 to 1e+100 | Required workspace parameter |
| Input: Central mass (kg) | 5.972e+24 | Range: 1e-100 to 1e+100 | Required workspace parameter |
| Worked Case 1: Baseline run (Bound-orbit semimajor axis (m) = 7000000) | Preloaded / test values | Calculate ideal instantaneous bound-orbit speed using vis-viva | Bound-orbit semimajor axis (m) = 7000000; Instantaneous orbital radius (m) = 7000000; Central mass (kg) = 5.972e+24. The displayed output is Orbital speed: 7545.94684014 m/s. |
| Worked Case 2: Comparison scenario (orbital velocity calculator earth) | Preloaded / test values | Calculate ideal instantaneous bound-orbit speed using vis-viva | Bound-orbit semimajor axis (m) = 1000000; Instantaneous orbital radius (m) = 1500000; Central mass (kg) = 1e20. The displayed output is Orbital speed: 47.167432267 m/s. |
Follow these three steps to configure Bound-orbit semimajor axis (m), Instantaneous orbital radius (m), Central mass (kg), verify unit and boundary rules, and export your Orbital Velocity Calculator output.
Enter bound-orbit semimajor axis (m). Allowed range: 1e-09 to 1e+100.
Set instantaneous orbital radius (m), central mass (kg). v=sqrt(G*M*(2/r-1/a)), G=6.67430e-11 SI.
Select Calculate to see the ideal instantaneous orbital speed. Copy result copies this text; Download saves it as a TXT file.
These concrete scenarios illustrate how the Orbital Velocity Calculator processes baseline inputs, comparison checks, and boundary constraints.
Bound-orbit semimajor axis (m) = 7000000; Instantaneous orbital radius (m) = 7000000; Central mass (kg) = 5.972e+24. The displayed output is Orbital speed: 7545.94684014 m/s.

Bound-orbit semimajor axis (m) = 1000000; Instantaneous orbital radius (m) = 1500000; Central mass (kg) = 1e20. The displayed output is Orbital speed: 47.167432267 m/s.

When solving for 'wave orbital velocity calculator', verify that Bound-orbit semimajor axis (m), Instantaneous orbital radius (m), Central mass (kg) use consistent units and stay within the documented scope: v=sqrt(G*M*(2/r-1/a)), G=6.67430e-11 SI. Requires r<2a; positive semimajor axis, negligible satellite mass, no orbit-state reconstruction or relativistic correction. Inputs and results use floating-point numbers; output shows up to 12 significant digits. Rounding can occur.

The output panel reports the exact result derived from Bound-orbit semimajor axis (m), Instantaneous orbital radius (m), Central mass (kg) alongside any unit or formatting notes.
The result is the ideal instantaneous orbital speed. Apply vis-viva to a stated orbital radius and semimajor axis.
The supplied bound-orbit model treats satellite mass as negligible and does not reconstruct an orbit state.
Numerical output shows up to 12 significant digits. Floating-point arithmetic and display rounding can affect the last digits.

Review these boundary constraints and validation rules before relying on the Orbital Velocity Calculator output.
Operational scope: v=sqrt(G*M*(2/r-1/a)), G=6.67430e-11 SI. Requires r<2a; positive semimajor axis, negligible satellite mass, no orbit-state reconstruction or relativistic correction. Inputs and results use floating-point numbers; output shows up to 12 significant digits. Rounding can occur. Inputs that violate minimum/maximum bounds or required format rules are rejected with a clear diagnostic prompt.
Need an adjacent calculation in Everyday Math? Use the related tools linked below to chain your workflow without leaving your browser.


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The Orbital Velocity Calculator applies the rule: Calculate ideal instantaneous bound-orbit speed using vis-viva. Enter Bound-orbit semimajor axis (m), Instantaneous orbital radius (m), Central mass (kg) into the workspace and the tool computes the exact output in your browser.
Yes. Provide Bound-orbit semimajor axis (m), Instantaneous orbital radius (m), Central mass (kg) using the documented units and format shown in the quick reference table above. Preloaded default values let you test the workflow immediately.
v=sqrt(G*M*(2/r-1/a)), G=6.67430e-11 SI. Requires r<2a; positive semimajor axis, negligible satellite mass, no orbit-state reconstruction or relativistic correction. Inputs and results use floating-point numbers; output shows up to 12 significant digits. Rounding can occur. Confirm that your inputs fall within the allowed ranges before exporting the result.
Yes. All calculations for the Orbital Velocity Calculator execute 100% locally in your browser's JavaScript runtime. No inputs or results are uploaded to any external server.
Choose another tool for your next calculation, conversion, or text task.