Converting Units of Time Made Easy (Simple Guide for Kids)
Time is one of the few measurements where the units don't follow the neat pattern of 10s that most other maths measurements do. There's no "100 minutes in an hour" shortcut — it genuinely helps to just know the three key facts and practise converting between them.
Those three facts are: 60 seconds make 1 minute, 60 minutes make 1 hour, and 24 hours make 1 day. Everything else in converting time builds from those.
Converting minutes and seconds
To turn minutes into seconds, multiply by 60. 3 minutes becomes 3 × 60 = 180 seconds. To turn seconds into minutes, divide by 60. 150 seconds becomes 150 ÷ 60 = 2.5 minutes.
Converting hours and minutes
To turn hours into minutes, multiply by 60. 2 hours becomes 2 × 60 = 120 minutes. To turn minutes into hours, divide by 60. 90 minutes becomes 90 ÷ 60 = 1.5 hours, or written as 1 hour and 30 minutes.
Converting days and hours
To turn days into hours, multiply by 24. 2 days becomes 2 × 24 = 48 hours.
Real-life example: a long car journey
A journey takes 150 minutes. Divide by 60 to convert to hours: 150 ÷ 60 = 2.5, which is 2 hours and 30 minutes — much easier to picture and plan around than 150 minutes alone.
Real-life example: a cooking timer
A recipe needs 4 minutes of cooking time, but a kitchen timer only counts down in seconds. Converting 4 minutes to seconds: 4 × 60 = 240 seconds, which is exactly what to set the timer to.
Practice questions
- Convert 4 minutes to seconds. Answer: 240 seconds
- Convert 300 seconds to minutes. Answer: 5 minutes
- Convert 3 hours to minutes. Answer: 180 minutes
- Convert 2 days to hours. Answer: 48 hours
- Convert 150 minutes to hours and minutes. Answer: 2 hours and 30 minutes
Common mistakes I see in the classroom
The most common one is treating time like a normal decimal number — writing 1.5 hours as "1 hour and 5 minutes" instead of the correct 1 hour and 30 minutes, since 0.5 of 60 minutes is 30, not 5.
Another frequent mistake is multiplying when division was needed, or the other way round — remembering that going from a bigger unit to a smaller one (hours to minutes) always means multiplying, while going from smaller to bigger (minutes to hours) always means dividing, keeps this consistent.
Tips for parents
Cooking timers and car journeys both offer easy, low-pressure practice. Asking "how many seconds is that?" when a recipe gives a time in minutes turns a normal kitchen moment into quick mental maths.
Tips for teachers
I always highlight that time conversions use 60 and 24, not 10 or 100 like most other units, since that's exactly where students trip up by applying decimal-style thinking out of habit. Saying it out loud, more than once, helps it stick.
How step-by-step learning tools help
A step-by-step maths tool can show exactly which operation converts between each unit of time and why, with unlimited fresh conversion questions for a child to practise at their own pace.
Frequently asked questions
How many seconds are in a minute? There are 60 seconds in 1 minute.
How many minutes are in an hour? There are 60 minutes in 1 hour.
How many hours are in a day? There are 24 hours in 1 day.
Why isn't time based on tens like most other measurements? Time units come from historical systems based on 60 and 24, long before the metric system was created, which is why they don't follow the same neat pattern as measuring length or mass.
At what age do children learn to convert units of time? Basic conversions between minutes and hours are usually introduced around age 8 to 9, with more detailed conversions following around age 10 to 11.
Sixty Is the Magic Number
Once a child trusts that time conversions almost always come back to 60, or 24 for days, the whole topic stops feeling like a separate set of rules to memorise. It becomes the same simple multiplying or dividing, just applied to a slightly different measurement than usual.