Online Calculators
Welcome to the Smart Unit Calc Calculators hub. Find free online calculators for math, finance, health, business, construction, electrical work, dates, time, science and everyday calculations. Select a calculator below to get accurate results with easy-to-use formulas and explanations.
Popular Calculators
Quickly access some of the most commonly searched online calculators.
Percentage Calculator
Calculate percentages, percentage increase, decrease and percentage difference.
Numbers to Words
Convert a number into English words with the free Numbers to Words Calculator
Age Calculator
Calculate exact age in years, months, days and more.
BMI Calculator
Calculate Body Mass Index using height and weight.
Loan Calculator
Calculate loan payments, interest and total repayment.
Mortgage Calculator
Estimate monthly mortgage payments and interest.
Scientific Calculator
Perform advanced mathematical and scientific calculations.
Math Calculators
Free mathematics calculators for percentages, fractions, equations, averages, ratios, geometry and everyday math.
Basic Calculator
Add, subtract, multiply and divide numbers.
Scientific Calculator
Advanced scientific and mathematical calculations.
Percentage Calculator
Find percentages and percentage changes.
Fraction Calculator
Add, subtract, multiply and divide fractions.
Ratio Calculator
Solve ratios and equivalent ratios.
Average Calculator
Calculate mean, average and related statistics.
Decimal to Fraction
Convert decimal numbers into fractions.
Fraction to Decimal
Convert fractions into decimal numbers.
GCD Calculator
Find the greatest common divisor of numbers.
LCM Calculator
Find the least common multiple of numbers.
Exponent Calculator
Calculate powers and exponents.
Square Root Calculator
Calculate square roots and related values.
Financial Calculators
Calculate loans, interest, mortgages, savings, investments, discounts, profit and other financial values.
Loan Calculator
Calculate monthly loan payments and total interest.
Mortgage Calculator
Estimate mortgage payments and loan costs.
Simple Interest Calculator
Calculate simple interest and final amount.
Compound Interest Calculator
Calculate compound interest and investment growth.
Discount Calculator
Calculate sale prices and discount amounts.
Profit Margin Calculator
Calculate profit, margin and markup.
Tip Calculator
Calculate tips and split restaurant bills.
Savings Calculator
Estimate savings growth over time.
Health & Fitness Calculators
Helpful calculators for BMI, calories, body measurements, fitness planning and general health-related calculations.
BMI Calculator
Calculate Body Mass Index using height and weight.
BMR Calculator
Estimate Basal Metabolic Rate.
Calorie Calculator
Estimate daily calorie requirements.
Body Fat Calculator
Estimate body fat percentage using measurements.
Ideal Weight Calculator
Estimate a healthy weight range using common formulas.
Pace Calculator
Calculate running and walking pace.
Date & Time Calculators
Calculate age, date differences, durations, deadlines, time differences and other calendar-related values.
Age Calculator
Calculate age between two dates.
Date Calculator
Add or subtract days, weeks and months from a date.
Date Difference Calculator
Find the exact difference between two dates.
Time Calculator
Add, subtract and calculate time durations.
Business Days Calculator
Calculate working days between dates.
Countdown Calculator
Calculate remaining time until a selected date.
Geometry & Measurement Calculators
Calculate area, perimeter, volume, surface area, dimensions and geometric measurements.
Area Calculator
Calculate area of common shapes.
Volume Calculator
Calculate volume of common 3D shapes.
Circle Calculator
Calculate radius, diameter, circumference and area.
Triangle Calculator
Calculate triangle sides, angles and area.
Rectangle Calculator
Calculate rectangle area and perimeter.
Cylinder Calculator
Calculate cylinder volume and surface area.
Construction Calculators
Useful construction calculators for concrete, materials, dimensions, roofing, flooring and building projects.
Concrete Calculator
Estimate concrete volume required for a project.
Gravel Calculator
Estimate gravel quantity and volume.
Mulch Calculator
Calculate mulch requirements for landscaping.
Roofing Calculator
Estimate roofing material requirements.
Tile Calculator
Calculate tiles required for floors and walls.
Paint Calculator
Estimate paint quantity for walls and surfaces.
Electrical Calculators
Electrical calculators for voltage, current, resistance, power, energy and common electrical engineering formulas.
Ohm's Law Calculator
Calculate voltage, current, resistance and power.
Electrical Power Calculator
Calculate electrical power from voltage and current.
Electricity Cost Calculator
Estimate electricity usage costs.
Voltage Drop Calculator
Estimate voltage drop in electrical circuits.
Wire Size Calculator
Estimate conductor size using specified inputs.
Battery Runtime Calculator
Estimate battery runtime from capacity and load.
Business Calculators
Business and workplace calculators for pricing, margins, revenue, profit, percentages and productivity.
Profit Calculator
Calculate profit and loss.
Profit Margin Calculator
Calculate gross and net profit margins.
Markup Calculator
Calculate markup percentage and selling price.
Salary Calculator
Calculate salary and pay-related values.
Hourly to Salary Calculator
Convert hourly pay into estimated annual salary.
Commission Calculator
Calculate sales commission and earnings.
Everyday Calculators
Simple calculators for shopping, cooking, travel, fuel, time, percentages and everyday decisions.
Tip Calculator
Calculate tips and split bills.
Discount Calculator
Calculate discounts and final prices.
Fuel Cost Calculator
Estimate fuel costs for a trip.
Fuel Economy Calculator
Calculate fuel consumption and efficiency.
Split Bill Calculator
Split restaurant and group expenses.
GPA Calculator
Calculate grade point average.
Science & Engineering Calculators
Mathematical, physics and engineering calculators for common scientific formulas and technical calculations.
Force Calculator
Calculate force using mass and acceleration.
Pressure Calculator
Calculate pressure from force and area.
Work Calculator
Calculate mechanical work and energy.
Power Calculator
Calculate power from work and time.
Speed Calculator
Calculate speed, distance and time.
Acceleration Calculator
Calculate acceleration from velocity and time.
Unit Converters
Convert measurements between metric, imperial, US customary and other commonly used units.
Weight Converter
kg, lb, grams, ounces, tons and more.
Temperature Converter
Celsius, Fahrenheit, Kelvin and more.
Area Converter
Square meters, square feet, acres and hectares.
Volume Converter
Liters, gallons, cups, cubic meters and more.
Speed Converter
km/h, mph, m/s, knots and more.
Time Converter
Seconds, minutes, hours, days and years.
Pressure Converter
PSI, bar, kPa, MPa, atm and more.
Energy Converter
Joules, kWh, calories, BTU and more.
Power Converter
Watts, kW, horsepower and BTU/h.
Force Converter
Newtons, kN, lbf, kgf and more.
Frequency Converter
Hz, kHz, MHz, GHz, RPM and more.
Data Converter
Bits, bytes, KB, MB, GB, TB and more.
Digital Storage Converter
GB, TB, GiB, TiB and storage units.
Data Transfer Converter
bps, Mbps, Gbps, MB/s and network speeds.
Why Use Smart Unit Calc?
Smart Unit Calc provides free online calculators and unit conversion tools designed for fast and straightforward calculations. Each calculator focuses on a specific task and provides formulas, examples and explanations to help you understand the result.
- Free online calculators
- Easy-to-use calculator interfaces
- Fast calculations directly in your browser
- Mobile-friendly responsive design
- Useful formulas and calculation explanations
- Math, finance, health, construction and engineering tools
- Unit conversion and measurement tools