Calculators

Percentage Calculator

Find the percentage of any number, what percent X is of Y, or do reverse percentage calculations. Covers percentage increase and decrease.

Square Footage Calculator

Calculate square footage of a room, house, wall, or flooring area. Supports rectangle, circle, triangle, and L-shapes with totals.

Age Calculator

Find out how old you are in years, months, and days from your date of birth. See total days lived and next birthday countdown.

Roofing Calculator

Estimate roofing materials for any project. Enter roof dimensions and pitch, choose your material type, and get squares, bundles, underlayment, and cost totals.

Tip Calculator

This tip calculator helps you work out gratuity and split the bill. Quick preset buttons for 10-25% tips with per-person splitting.

BTU (Heating & Cooling) Calculator

Calculate the BTU needed to heat or cool a room. Factors in insulation, climate zone, sun exposure, and occupants. Shows AC unit size.

Gravel Calculator

Work out how much gravel you need for a driveway, path, or garden. Get tons, cubic yards, bags, and cost in one click.

Scientific Calculator

Free online scientific calculator with trig functions, logarithms, exponents, memory, parentheses, and a history of recent calculations.

Fraction Calculator

This fraction calculator adds, subtracts, multiplies, and divides fractions or mixed numbers. Results are simplified with step-by-step solutions.

Date Difference Calculator

This date difference calculator finds the exact gap between two dates in years, months, days, weeks, hours, and minutes. Add or subtract days too.

Aspect Ratio Calculator

Calculate aspect ratios from width and height. Resize dimensions proportionally with common presets and a visual preview.

Tank Volume Calculator

Calculate tank volume for cylinders, rectangles, and spheres. Shows gallons, liters, cubic feet, and barrels. Supports partial fill levels.

Average Calculator

Calculate mean, median, mode, range, and more for any number set. Includes weighted average mode and a visual distribution of your data.

Standard Deviation Calculator

Free standard deviation calculator for any data set. Get variance, mean, and more with population and sample modes plus step-by-step breakdowns.

Child & Teen BMI Calculator

Calculate BMI for children and teens aged 2-19 using CDC growth charts. Get percentile and weight category based on age and sex.

Watts to Amps Calculator

This watts to amps calculator converts between watts and amps for DC and AC circuits. Includes power factor input and an appliance reference table.

Drywall Calculator

Calculate drywall sheets, screws, joint compound, and tape for any room. Supports 4x8 and 4x12 sheets with door and window deductions.

Gas Mileage Calculator

Calculate your vehicle's fuel efficiency in MPG and L/100km. Estimate trip fuel costs and compare two vehicles side by side.

Speed Distance Time Calculator

Calculate speed, distance, or time from the other two values. Supports mph, km/h, m/s, miles, and km with step-by-step solutions.

Wind Chill Calculator

Calculate wind chill from temperature and wind speed using the NWS formula. Shows frostbite risk and danger level with color-coded warnings.

Dew Point Calculator

Calculate dew point from temperature and humidity using the Magnus formula. See comfort level, condensation risk, and a humidity comfort scale.

Dog Years Calculator

Convert your dog's age to human years by breed size using the modern veterinary formula. See the human-year equivalent and life stage gauge.

Net Carbs Calculator

Calculate net carbs by subtracting fibre and sugar alcohols from total carbs. Free keto and low-carb tool with food reference table.

Dilution Calculator

Solve C1V1 = C2V2 dilution equations instantly. Find the volume or concentration needed for any solution dilution in chemistry or biology.

US Required Minimum Distribution (RMD) Calculator

Estimate US Required Minimum Distribution (RMD) from your IRA or 401(k) using the IRS Uniform Lifetime Table. Plan retirement withdrawals.