Ratio & proportion tools
1:1 Ratio Calculator
A 1:1 ratio has 2 total parts, and the first part is 50% of the whole, the second part is 50% of the whole. The ratio is already in its simplest form.
1:1
Simplest form 1:1 · 2 total parts
100
Exact result
50 units · 50 units
50% : 50% · 2 total parts · 1 part = 50 units
first part
second part
- Total parts
- 2
- Simplest form
- 1 : 1
- One part
- 50 units
Know one side instead?
Enter one measured amount to scale the whole ratio.
Working
- Add the parts: 2 total parts.
- One part = 100 ÷ 2 = 50 units.
- Multiply one part by each ratio part: 50 and 50.
Equivalent 1:1 ratios
- 1 : 1
- 2 : 2
- 3 : 3
- 4 : 4
- 5 : 5
- 6 : 6
What 1:1 means
A 1:1 ratio has 2 total parts. Each part is worth the total divided by 2, so the shares are 50% and 50% of whatever you are dividing.
- Total parts
- 2
- Simplest form
- 1:1
- One part of 100
- 50
Where this ratio shows up
An even split. It turns up in two-person cost sharing, 1:1 syrup-to-water simple syrup, and square 1:1 image crops.
Worked example
Dividing 100 in a 1:1 ratio gives 50 and 50. Add them back together and you get 100 exactly — a quick way to check any split.