Percentage Change Calculator
Compare an old value to a new value as a percent change.
Basic Calculator
Type an expression here or use the keypad. Press Enter or = to evaluate.
0
Precision calculators, built for clarity
RapidRatio.tools provides instant, reliable calculations you can trust. From mortgage payments to complex unit conversions, get the right answer the first time with our lightweight, pro-grade tools.
Fraction To Decimal Calculator
Turn any fraction into a decimal with BigNumber division.
Decimal To Fraction Converter
Convert decimals to fractions with optional simplification and a mixed-number line when it helps.
Ratio Calculator
See true or false when X:Y matches A:B—no auto-editing of your inputs.
Average Calculator
Paste a list of numbers to get Mean, Median, Mode, and Range instantly.
Percentage Calculator
3-in-1 percent formulas: X% of Y, percent of Y, and reverse percent value.
Why BigNumber?
Short guide on stable numeric presentation for calculators.