How to use the inclined plane calculator
Prepare the values for this calculation
Resolve weight into components parallel and normal to a frictionless incline. Use the formula below to check that it answers your question. Read the input units before transferring figures from a statement, measurement or dataset.
Enter and check each input
- Mass (kg): enter a value at least 0. Use the unit named in the label or selected above. Do not leave this required field blank.
- Incline angle (degrees): enter a value at least 0 and no more than 90. Use the unit named in the label or selected above. Do not leave this required field blank.
- Gravitational acceleration (m/s²): enter a value at least 1e-06. Use the unit named in the label or selected above. Do not leave this required field blank.
The input table gives a complete example. Keep units and time periods consistent across related fields.
Calculate and resolve any input error
Choose Calculate after entering the values. Changes also update the answer after a short pause. If an error appears, follow its message, correct the field and calculate again. Reset restores the example values.
Interpret the answer
Check Down-slope force first. With the unchanged example inputs, it is 49.03325 N. Compare the additional metrics with the primary result; each has its own label and unit.
Compare and keep a useful result
For a controlled comparison, keep every other example input unchanged and change Mass (kg) from 10 to 11. The resulting Down-slope force is 53.936575 N. This illustrates the equation’s response to that input, rather than a forecast of real events.
Read the chart’s axis labels and data table. A scenario curve changes one stated input while holding the others fixed; it does not add external observations. Use Download graph to save an available chart as a PNG.
Use Copy result or Download CSV to keep the answer. Share tool shares the page address without placing your input values in the URL. Recheck inputs and assumptions before using the result for a decision.
Inclined Plane Calculator formula
F_parallel=mg sinθ; N=mg cosθ.
Inputs and units
| Input | Format / range | Example |
|---|---|---|
| Mass (kg) | minimum 0 | 10 |
| Incline angle (degrees) | minimum 0; maximum 90 | 30 |
| Gravitational acceleration (m/s²) | minimum 1e-06 | 9.80665 |
Worked example
Using the example inputs above, the down-slope force is 49.03325 N.
- Down-slope force
- 49.03325 N
- Normal force
- 84.9280802602 N
Results and assumptions
The output uses the down-slope force convention and formula shown above. Match the entered units and source assumptions when comparing results.
Fix an input or unexpected result
Mass (kg) is required. Enter mass (kg) using the format and bounds in the input table. Zero and an empty field are different: use zero only if it is allowed and represents your data.
If your answer differs from the example, choose Reset and compare every field, including selected units and options. Check percentage versus decimal entry and whether values describe the same period. Round only the final displayed answer when reproducing the formula.
If a discrepancy remains, report the calculator issue with the page address, non-sensitive example inputs, actual result, expected result and a reference for your calculation.