Mileage Calculator
Speed Reference
Quick Distances
Related Calculators
Understanding Distance Calculations
The Distance Formula
Distance, speed, and time are interrelated through a simple formula. Knowing any two values allows you to calculate the third. This is fundamental to planning trips, estimating arrival times, and calculating fuel needs.
Core Formulas
Average Driving Speeds
| Road Type | Speed Limit | Avg Travel Speed |
|---|---|---|
| Interstate Highway | 65-75 mph | 55-65 mph |
| State Highway | 55-65 mph | 45-55 mph |
| Urban Streets | 25-45 mph | 15-25 mph |
| Residential | 25-35 mph | 20-30 mph |
Average travel speeds account for traffic, stops, and typical conditions
Trip Planning Factors
Time Additions
- Rest stops: 15-30 min each
- Meal breaks: 30-60 min
- Gas stops: 10-15 min
- Traffic delays: varies
- Construction zones
Distance Factors
- Routes are rarely straight
- Mountain roads add distance
- Detours may be needed
- GPS vs actual can differ 5-10%
- Road conditions matter
Unit Conversions
Distance
- 1 mile = 1.609 km
- 1 km = 0.621 miles
- 1 mile = 5,280 feet
- 1 nautical mile = 1.151 miles
Speed
- 60 mph = 96.6 km/h
- 100 km/h = 62.1 mph
- 1 knot = 1.151 mph
- 1 m/s = 2.237 mph
IRS Mileage Rate (2024)
The standard mileage rate for business use is 67 cents per mile. For medical/moving purposes it is 21 cents, and for charity work it is 14 cents per mile. These rates are updated annually and can be used for tax deductions.
Frequently Asked Questions
How do I calculate travel time from distance?
Divide distance by average speed: Time = Distance / Speed. For a 300-mile trip at 60 mph average: 300 / 60 = 5 hours. Add 15-20% for stops, traffic, and rest breaks for realistic estimates.
What is the IRS mileage rate?
The IRS standard mileage rate for 2024 is 67 cents per mile for business use, 21 cents for medical/moving, and 14 cents for charitable work. These rates cover gas, maintenance, depreciation, and insurance costs.
How do I convert miles to kilometers?
Multiply miles by 1.609 to get kilometers. To convert km to miles, multiply by 0.621. Quick reference: 100 miles = 161 km, 100 km = 62 miles.
What average speed should I use for trip planning?
Use 55-65 mph for highway trips, 25-35 mph for urban driving. For mixed routes, 45-50 mph is realistic. Always add buffer time for traffic, construction, and rest stops.