Other Calculators

Age Calculator

Calculate exact age in years, months, and days between two dates. Find the number of days until your next birthday.

Date Calculator

Add or subtract days, weeks, months, or years to/from any date. Calculate the difference between two dates in any unit.

Time Calculator

Add or subtract time durations. Convert between hours, minutes, seconds. Calculate elapsed time and time differences.

Hours Calculator

Calculate total hours worked between clock-in and clock-out times. Compute weekly hours, overtime, and earnings.

GPA Calculator

Calculate your GPA on a 4.0 scale from letter grades and credit hours. Includes cumulative GPA and term GPA calculations.

Grade Calculator

Calculate your final grade from assignments, tests, and exams using weighted averages. Find out what you need on the final exam.

Tip Calculator

Calculate the tip amount and total bill per person. Split the check evenly among any number of people.

Fuel Cost Calculator

Calculate fuel cost for any trip based on distance, fuel efficiency, and gas price. Compare costs for different vehicles.

Concrete Calculator

Calculate how much concrete you need for slabs, columns, footings, and steps. Results in cubic yards, cubic feet, and bags.

Square Footage Calculator

Calculate square footage of rooms and spaces. Add multiple areas for total project square footage for flooring, paint, or real estate.

IP Subnet Calculator

Calculate subnet mask, network address, broadcast address, host range, and number of usable hosts for any CIDR notation.

Password Generator

Generate strong, secure random passwords with custom length and character sets. Includes password strength meter and entropy calculation.

Dice Roller

Virtually roll any combination of dice: d4, d6, d8, d10, d12, d20, and custom dice. Perfect for board games and tabletop RPGs.

Gas Mileage Calculator

Calculate fuel economy in MPG or L/100km from miles driven and gallons used. Track and improve your vehicle's efficiency.

Speed Calculator

Calculate speed, distance, or time. Solve for any variable in the speed = distance/time formula. Convert between units.

Weight Calculator

Convert weight between pounds, kilograms, grams, ounces, stone, and metric tons. Calculate weight on different planets.

Mass Calculator

Calculate mass from density and volume, or find any variable in the mass = density × volume equation.

Density Calculator

Calculate density, mass, or volume from any two known values. Includes a density table for common materials.

Voltage Drop Calculator

Calculate voltage drop and percentage drop in electrical circuits. Find the correct wire gauge to minimize energy loss.

Ohm's Law Calculator

Calculate voltage, current, resistance, or power using Ohm's Law (V=IR) and the power formula (P=VI). Enter any two values.

Electricity Calculator

Calculate electricity consumption cost for any appliance. Estimate monthly and annual power bills based on wattage and usage hours.

BTU Calculator

Calculate the BTU needed to heat or cool a room. Size your air conditioner or heater correctly for maximum efficiency.

Roman Numeral Converter

Convert between Roman numerals and standard (Arabic) numbers instantly. Supports numbers from 1 to 3,999.

Base64 Encode / Decode

Encode text to Base64 or decode Base64 back to plain text. Supports URL-safe Base64 and binary data encoding.

URL Encode / Decode

URL encode special characters for safe use in web addresses. Decode URL-encoded strings back to readable text.

Time Card Calculator

Calculate total weekly hours from daily clock-in/clock-out times. Automatically computes regular hours, overtime, and gross pay.

Time Zone Calculator

Convert time between any of the world's time zones. Plan international meetings and travel across time zones.

Day Counter

Count the exact number of days between two dates, including or excluding weekends and holidays. Track deadlines and project timelines.

Day of the Week Calculator

Find out what day of the week any date falls on. Calculate past, present, and future dates instantly.

Time Duration Calculator

Calculate the exact duration between two times on the same day or across days. Great for tracking work sessions and events.

Bandwidth Calculator

Calculate download/upload time, network throughput, and required bandwidth for any file size and internet speed.

Wind Chill Calculator

Calculate the wind chill temperature (feels-like temperature) based on air temperature and wind speed. Uses official NWS formula.

Heat Index Calculator

Calculate the apparent temperature (feels-like heat index) based on air temperature and relative humidity using the NWS Rothfusz equation.

Dew Point Calculator

Calculate dew point temperature and relative humidity from temperature and either dew point or humidity using Magnus formula.

Tile Calculator

Calculate how many tiles you need for a floor or wall. Accounts for tile size, grout spacing, and waste percentage.

Roofing Calculator

Calculate roofing material quantities including shingles, underlayment, and ridge caps. Estimates for gable, hip, and shed roofs.

Gravel Calculator

Calculate how much gravel, crushed stone, or sand you need for driveways, paths, and landscaping projects. Results in tons and cubic yards.

Mulch Calculator

Calculate how many cubic yards or bags of mulch you need for garden beds and landscaping areas.

Stair Calculator

Calculate stair dimensions including number of steps, rise, run, and total stringer length. Ensures IBC/IRC code compliance.

Resistor Calculator

Decode resistor color bands to find resistance value and tolerance. Also calculate series and parallel resistor combinations.

Shoe Size Conversion

Convert shoe sizes between US, UK, EU, and AU sizing systems for men, women, and children. Includes foot length measurement guide.

Mileage Calculator

Calculate IRS mileage reimbursement for business, medical, or charity travel. Track mileage for tax deductions.

Horsepower Calculator

Calculate engine horsepower from torque and RPM, or convert between HP, kW, and PS. Estimate quarter-mile time and trap speed.

Tire Size Calculator

Calculate tire dimensions from P-metric tire code (e.g., 225/55R17). Compare two tire sizes and find the speedometer error.

GDP Calculator

Calculate GDP using the expenditure approach (C + I + G + NX). Understand the components of Gross Domestic Product.

Golf Handicap Calculator

Calculate your golf handicap index based on recent scores. Understand Handicap Differentials and the World Handicap System (WHS).

Molarity Calculator

Calculate the molarity of a solution from moles/grams of solute and volume of solution. Essential for chemistry lab preparations.

Molecular Weight Calculator

Calculate the molecular weight (molar mass) of any chemical formula. Supports complex organic and inorganic compounds.