myFree Math & Number Calculators
10 calculators
Free maths and number calculators for percentages, fractions, GPA calculation, standard deviation, Roman numeral conversion, binary/hex/octal base conversion, scientific calculations and more. Clear, instant results for students, teachers and everyday use.
Aspect Ratio Calculator
Scaled dimensions for images and video.
Decision Maker
Random picker with weighted spin animation.
Fraction Calculator
Add, subtract, multiply & divide fractions with simplification.
GPA Calculator
US GPA from letter grades and credit hours.
Number Base Converter
Convert between binary, octal, decimal and hexadecimal.
Percentage Calculator
% of a number, what %, and % change.
Random Number Generator
Generate random numbers, roll dice or flip a coin.
Roman Numeral Converter
Convert numbers to and from Roman numerals, 1–3,999.
Scientific Calculator
Trig, log, sqrt, factorial and memory functions.
Standard Deviation
Mean, variance & std dev from any dataset.
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