How to use:
Enter any two values (speed, distance, or time) and the third will be calculated automatically.
Use decimal point (.) for fractional numbers. When two values are entered, the third input field will be locked, but you can still change its units to get the result in your preferred measurement.
Example: 60, 25.5, 100
Example: 120, 15.5, 1000
Example: 2, 30, 1.5
Decimal Places:
Thousands Separator:
Speed Distance Time Calculator
The Speed Distance Time (SDT) Calculator is a comprehensive tool that calculates any missing value when two of the three fundamental motion parameters are known. This calculator supports multiple units of measurement and provides instant calculations using the fundamental kinematic relationships.
📐 Core Formulas
- Speed = Distance ÷ Time (v = d/t)
- Distance = Speed × Time (d = v×t)
- Time = Distance ÷ Speed (t = d/v)
💡 Example Calculation
Given: A car travels at 60 km/h for 2 hours
Find: Distance traveled
Solution: Distance = Speed × Time = 60 km/h × 2 h = 120 km
Multi-Unit Support
Convert between km/h, mph, m/s, knots and more
Smart Input Lock
Automatically locks the third field when two values are entered
Visual Formula Guide
Interactive diagram showing relationship between variables
Customizable Precision
Adjustable decimal places and number formatting
The calculator intelligently handles unit conversions between different measurement systems including metric (km, m, cm), imperial (miles, feet, inches), and specialized units (nautical miles, knots). Users can enter values in any supported unit and view results in their preferred format.
🔒 Privacy & Security
This calculator operates entirely within your browser using client-side JavaScript. No data is transmitted to external servers, ensuring complete privacy and security of your calculations. All computations are performed locally on your device.