This calculator helps you understand the relationship between rate, time, and distance. It's a fundamental concept in physics and everyday life, allowing you to predict how long a journey will take or how fast you need to travel given certain parameters.
The core formula is: **Distance = Rate × Time**
From this, we can derive the other two variables:
* **Rate = Distance / Time**
* **Time = Distance / Rate**
This calculator allows you to input any two of these values (Distance, Rate, or Time) and it will calculate the third.
**Example:**
Imagine you are planning a road trip of 300 miles. You want to know how long it will take if you maintain an average speed of 60 miles per hour.
* Distance: 300 miles
* Rate: 60 mph
The calculator will determine that the Time taken is 5 hours.
Alternatively, if you know you need to cover 300 miles in 4 hours, you can calculate the required Rate:
* Distance: 300 miles
* Time: 4 hours
The calculator will determine that your average Rate needs to be 75 mph.
Rate, Time, Distance Calculator
Miles
Kilometers
Meters
Miles per Hour
Kilometers per Hour
Meters per Second
Hours
Minutes
Seconds
function calculateRTD() {
var distance = parseFloat(document.getElementById("distance").value);
var rate = parseFloat(document.getElementById("rate").value);
var time = parseFloat(document.getElementById("time").value);
var distanceUnit = document.getElementById("distanceUnit").value;
var rateUnit = document.getElementById("rateUnit").value;
var timeUnit = document.getElementById("timeUnit").value;
var calculatedResult = "";
var resultUnit = "";
var unitConversionFactor = {
distance: {
miles: 1,
km: 1.60934,
meters: 1609.34
},
rate: {
mph: 1,
kph: 1.60934,
mps: 1609.34 / 3600
},
time: {
hours: 1,
minutes: 1/60,
seconds: 1/3600
}
};
// Convert all inputs to a base unit for calculation (e.g., meters, meters/second, seconds)
var baseDistance = distance * unitConversionFactor.distance[distanceUnit];
var baseRate = rate * unitConversionFactor.rate[rateUnit];
var baseTime = time * unitConversionFactor.time[timeUnit];
// — Calculation Logic —
if (!isNaN(distance) && !isNaN(rate) && isNaN(time)) {
// Calculate Time
if (baseRate === 0) {
calculatedResult = "Cannot calculate time: Rate cannot be zero.";
} else {
var calculatedTimeInSeconds = baseDistance / baseRate;
calculatedResult = calculatedTimeInSeconds / unitConversionFactor.time[timeUnit];
resultUnit = timeUnit;
}
} else if (!isNaN(distance) && isNaN(rate) && !isNaN(time)) {
// Calculate Rate
if (baseTime === 0) {
calculatedResult = "Cannot calculate rate: Time cannot be zero.";
} else {
var calculatedRateInMps = baseDistance / baseTime;
calculatedResult = calculatedRateInMps / unitConversionFactor.rate[rateUnit];
resultUnit = rateUnit;
}
} else if (isNaN(distance) && !isNaN(rate) && !isNaN(time)) {
// Calculate Distance
var calculatedDistanceInMeters = baseRate * baseTime;
calculatedResult = calculatedDistanceInMeters / unitConversionFactor.distance[distanceUnit];
resultUnit = distanceUnit;
} else {
calculatedResult = "Please enter exactly two values to calculate the third.";
}
var resultElement = document.getElementById("result");
if (resultElement) {
if (resultUnit) {
resultElement.innerHTML = "Result: " + calculatedResult.toFixed(2) + " " + resultUnit;
} else {
resultElement.innerHTML = calculatedResult; // Display error message
}
}
}
.calculator-container {
font-family: sans-serif;
border: 1px solid #ccc;
padding: 20px;
border-radius: 8px;
max-width: 400px;
margin: 20px auto;
background-color: #f9f9f9;
}
.calculator-container h2 {
text-align: center;
color: #333;
margin-bottom: 20px;
}
.input-section {
margin-bottom: 15px;
display: flex;
align-items: center;
gap: 10px;
}
.input-section label {
flex: 1;
min-width: 80px;
color: #555;
}
.input-section input[type="number"] {
flex: 2;
padding: 8px;
border: 1px solid #ccc;
border-radius: 4px;
width: 100%;
box-sizing: border-box;
}
.input-section select {
padding: 8px;
border: 1px solid #ccc;
border-radius: 4px;
}
.calculator-container button {
display: block;
width: 100%;
padding: 10px;
background-color: #007bff;
color: white;
border: none;
border-radius: 4px;
font-size: 16px;
cursor: pointer;
margin-top: 10px;
transition: background-color 0.3s ease;
}
.calculator-container button:hover {
background-color: #0056b3;
}
#result {
margin-top: 20px;
padding: 10px;
background-color: #e9ecef;
border: 1px solid #ced4da;
border-radius: 4px;
text-align: center;
font-weight: bold;
color: #495057;
}