Ratio & proportion tools
1:4 Ratio Calculator
A 1:4 ratio has 5 total parts, and the first part is 20% of the whole, the second part is 80% of the whole. The ratio is already in its simplest form.
1:4
Simplest form 1:4 · 5 total parts
500
Exact result
100 units · 400 units
20% : 80% · 5 total parts · 1 part = 100 units
first part
second part
- Total parts
- 5
- Simplest form
- 1 : 4
- One part
- 100 units
Know one side instead?
Enter one measured amount to scale the whole ratio.
Working
- Add the parts: 5 total parts.
- One part = 500 ÷ 5 = 100 units.
- Multiply one part by each ratio part: 100 and 400.
Equivalent 1:4 ratios
- 1 : 4
- 2 : 8
- 3 : 12
- 4 : 16
- 5 : 20
- 6 : 24
What 1:4 means
A 1:4 ratio has 5 total parts. Each part is worth the total divided by 5, so the shares are 20% and 80% of whatever you are dividing.
- Total parts
- 5
- Simplest form
- 1:4
- One part of 500
- 100
Where this ratio shows up
A frequent cleaning-concentrate and feed strength: one part product to four parts water gives a fifth-strength mix.
Worked example
Dividing 500 in a 1:4 ratio gives 100 and 400. Add them back together and you get 500 exactly — a quick way to check any split.