Ratio & proportion tools
4:1 Ratio Calculator
A 4:1 ratio has 5 total parts, and the first part is 80% of the whole, the second part is 20% of the whole. The ratio is already in its simplest form.
4:1
Simplest form 4:1 · 5 total parts
500
Exact result
400 units · 100 units
80% : 20% · 5 total parts · 1 part = 100 units
first part
second part
- Total parts
- 5
- Simplest form
- 4 : 1
- 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: 400 and 100.
Equivalent 4:1 ratios
- 4 : 1
- 8 : 2
- 12 : 3
- 16 : 4
- 20 : 5
- 24 : 6
What 4:1 means
A 4:1 ratio has 5 total parts. Each part is worth the total divided by 5, so the shares are 80% and 20% of whatever you are dividing.
- Total parts
- 5
- Simplest form
- 4:1
- One part of 500
- 100
Where this ratio shows up
Four times as much of the first quantity, so it makes up four-fifths of the total. Common in render mixes and weighted shares.
Worked example
Dividing 500 in a 4:1 ratio gives 400 and 100. Add them back together and you get 500 exactly — a quick way to check any split.