Speed Distance Time Calculator
Work out average speed from distance and time, in mph and km/h.
Your result
Average speed5.82 mph
In km/h9.37
Time per mile10:18
Updates as you type. Based on 2025/26 UK figures where relevant.
How this is worked out
Speed = distance ÷ time. We convert your hours and minutes to decimal hours first.
Tips
- UK MPG uses imperial gallons (4.546 litres), which differ from US gallons.
- HMRC's approved mileage rate is 45p per mile for the first 10,000 business miles.
- Home EV charging on an off-peak tariff is usually far cheaper than public rapid chargers.
Guides for this calculator
- How to Calculate Average Speed in the UK: Step-by-Step Guide
- Average Speed: Common Mistakes, Tips and FAQs
More motoring calculators
Frequently asked questions
How does the speed Distance Time Calculator work?
Speed = distance ÷ time. We convert your hours and minutes to decimal hours first.
What MPG should I use?
Use your real-world figure from your car's trip computer if you can; official figures are often optimistic.
Can I claim for commuting miles?
No. Normal commuting to a permanent workplace doesn't count as business mileage.
How often do HMRC mileage rates change?
Rarely. The 45p rate has been unchanged for many years, but always check GOV.UK.
This calculator gives an estimate for general information. It isn't financial, tax, legal or medical advice. Check official figures on GOV.UK or NHS.uk, or speak to a qualified adviser.