All Free Online Calculators
Browse the full collection of free calculators for finance, health, math, conversions and everyday decisions. Search instantly or jump straight to a category.
Training heart rate zones using the Karvonen method.
Estimated due date from the first day of your last period.
Area, circumference, and diameter from the radius.
Area, perimeter, and diagonal of a rectangle.
Real roots of ax² + bx + c = 0.
Greatest common divisor and least common multiple.
Mean, variance, and standard deviation of a data set.
Solve a : b = c : x.
Convert km/h, m/s, mph, and knots.
Liters, milliliters, gallons, cups, and fluid ounces (US).
Square meters, square feet, acres, and hectares.
Bytes, KB, MB, GB, and TB (decimal units).
Fuel consumption in L/100 km, km/L, and miles per gallon.
Add or subtract days from a date.
Hours and minutes between two times.
Fuel needed and cost for a trip.
Compare two products by price per unit.
Days remaining until a date.
What a device costs to run.
Weighted GPA from grade points and credits.
The score you need on the final exam.
Percentage and letter grade from points.
Estimated reading and speaking time.
Paint needed to cover the walls of a room.
Concrete volume for a slab.
Number of square tiles for a floor.
Selling price, profit, and margin from cost and markup.
Commission earned and total pay from sales.
Invoice total with discount, tax, and shipping.
How long an investment takes to earn its money back.