Equivalent means same multiplier
Multiply or divide every term by the same nonzero value. The relationship stays unchanged.
SIMPLIFY · SCALE · SPLIT · PRACTICE
Ratio Calculator
Reduce ratios exactly, build equivalent ratios, solve missing values, split totals, compare relationships, and convert a two-part ratio into fractions, decimals, percentages, and part-of-total shares.
2–6ratio terms
exactrational core
localno account
SIMPLIFY RATIO
Enter the relationship once. See the simplest form and why.
Whole numbers, decimals, scientific notation, fractions, and mixed numbers are accepted.
SIMPLEST RATIO2 : 3
12 : 18 reduces without changing the relationship.
terms2
common factor removed6
denominator clearing factor1
VISUAL RELATIONSHIP
EQUIVALENT RATIOS
RATIO WORKSPACE
Common ratio problems in one place
equivalent ratio12 : 20
3:5 × 4 term-by-term
missing value12
4 × 21 = 7 × 12
shares15 · 10
5 total ratio units
comparisonEquivalent
0.6667 vs 0.6667 as A ÷ B
simplest ratio3 : 5
Canonical reduced form
CONVERSION DETAILS
Read a two-part ratio from several useful angles
A ÷ B fraction3/5
A ÷ B decimal0.6
A as % of B60%
part-of-total shares37.5% / 62.5%
unit ratios1 : 1.6666666667 · 0.6 : 1
DAILY 12
Build ratio instincts
0 / 0best —
SIMPLIFY
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FOCUSED PRACTICE
Keep going without an account
0 / 0streak 0
MIXED
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Simplify all terms together
For 12:18:30, divide every term by 6. Do not simplify different pairs with different factors.
Split by ratio units
For 3:2, there are 5 total units. A total of 25 becomes 15 and 10.
A:B and part-of-total are different
3:5 means A/B = 60%, but A is 3/8 = 37.5% of the combined total.
Methods, exactness & scope
Exact rational input
Whole numbers, decimals, scientific notation, fractions, and mixed numbers are converted to exact rational values with JavaScript BigInt before simplification or comparison. Decimal output is only a display layer.
Ratios can have more than two terms
The simplifier and scaler accept 2–6 terms. Split mode also supports multiple non-negative ratio parts, so recipes, allocations, and multi-group splits can be handled directly.
Local learning product
The calculator, Daily 12, and practice run in the browser. No server account, global ranking, or public history is implied.