Ratio Calculator
Simplify a two-part ratio and compare its decimal value and percentage shares.
Tool code processes selected files and entered content in your browser and does not submit them to a TOOLGRID processing endpoint. TOOLGRID measures tool usage, not the content you enter.
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Browser-basedWhat this tool does
Simplify two numeric values into a colon ratio, calculate left divided by right, and show each side as a share of their sum. Decimal and exponent inputs are parsed as exact base-10 fractions for reduction; comparison displays are rounded separately.
For 16 and 9 the simplified ratio remains 16:9, the decimal comparison is about 1.7778, and the shares are 64% and 36% of the combined 25 parts.
Use values with the same unit and non-negative meaning when interpreting shares; mixed signs or a zero-sum pair can produce mathematically valid ratios that are not useful allocations.
What you can do with this tool
Simplify pixel dimensions such as 1920:1080 to 16:9 before documenting an image or video requirement.
Reduce two ingredient quantities to a reusable proportion after converting both values to the same unit.
Show both the part-to-part ratio and each side's percentage of the combined total for a budget or sample split.
What to check before relying on the result
- Performance and maximum practical input size depend on browser memory, device speed, and the structure of the input.
- Review the generated result before replacing or publishing an original file.
How to use
- 1
Enter the left and right quantities using the same measurement unit.
- 2
Read the reduced colon ratio and decimal left-to-right comparison.
- 3
Review each side's percentage of the sum when the values represent compatible non-negative parts.
- 4
Check rounding before reusing a decimal ratio in layout, recipe, or allocation calculations.
Use Cases
Simplify pixel dimensions such as 1920:1080 to 16:9 before documenting an image or video requirement.
Reduce two ingredient quantities to a reusable proportion after converting both values to the same unit.
Show both the part-to-part ratio and each side's percentage of the combined total for a budget or sample split.
Tips & Tricks
A ratio between 1 meter and 50 centimeters should be entered as 100:50 or 1:0.5, not 1:50.
The colon ratio is reduced from the entered base-10 fraction without a six-place rounding step. The separate decimal and percentage cards are display-rounded.
A right side of zero produces an infinite decimal ratio. When the two sides sum to zero, percentage shares are shown as — because an allocation denominator does not exist.
FAQ
Can both values be zero?
No. At least one side must be non-zero.
What is a simplified ratio?
Both values are divided by their greatest common divisor, so 4:6 becomes 2:3.
Can I use decimal inputs?
Yes. Accepted decimal and exponent text is converted to an exact base-10 fraction for greatest-common-divisor reduction. Extremely large, malformed, or unsafe display values fail closed.
What happens when the right value is zero?
The simplified ratio is still shown and the decimal left-to-right value is infinity. Percentage shares remain meaningful only when the combined total is non-zero.
Do the two percentage shares always add to 100%?
They do for ordinary non-negative values with a non-zero total, subject to display rounding. Mixed signs and a zero-sum pair are not meaningful allocation inputs.
Useful next steps
Open a nearby browser tool when you need to validate, convert, or reuse the result.