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Calculators tools
33 free calculators tools — private and offline.
Percentage Calculator
what is X% of Y
Percent Change
% increase / decrease
Is What Percent
X is what % of Y
Discount Calculator
sale price after % off
Tip Calculator
tip + split a bill
Sales Tax
add tax to a price
Average / Mean
mean, median and mode of a list
Aspect Ratio
solve missing dimension
Screen PPI
pixels per inch of a display
Ratio Simplifier
reduce a ratio to lowest terms
Fraction → Decimal
numerator ÷ denominator
Final Grade Needed
score needed on the final
Weighted Average
values × weights
Standard Deviation
mean, variance, σ
Circle
area, circumference from radius
Right Triangle
hypotenuse + angles from a, b
Speed · Distance · Time
time from distance & speed
Density
mass ÷ volume
Ohm's Law
V, I → resistance & power
Recipe Scaler
scale an ingredient by servings
Quadratic Solver
roots of ax² + bx + c
GCD & LCM
greatest common divisor + LCM
Prime Checker
is it prime? + prime factors
Factorial
n!
Permutations & Combinations
nPr and nCr
Power / Root
base^exp and the exp-th root
Logarithm
log in any base + natural log
Distance Between Points
2D distance + midpoint
Line Slope
slope, angle, y-intercept
Percentage Error
measured vs actual
Rounding
round to N decimals / sig figs
Area of Shapes
rectangle, triangle, circle, trapezoid
Volume of Shapes
box, cylinder, sphere, cone