All Calculators
100+ free tools across finance, health, math, date, construction, and unit conversion categories.
116 calculators found
Loan Calculator
Monthly payments & total interest
Mortgage Calculator
Amortization & extra payments
Compound Interest
Investment growth over time
Tip Calculator
Split bills & calculate tips
Currency Converter
Convert world currencies
BMI Calculator
Body Mass Index & weight status
Calorie Calculator
TDEE, calories & macros
Ideal Weight
Healthy weight range by height
Body Fat Calculator
Body fat percentage estimate
Pregnancy Calculator
Due date & gestational age
Percentage Calculator
% of, % change, reverse %
Final Grade Calculator
What do I need on the final?
Scientific Calculator
Advanced math functions
Fraction Calculator
Add, subtract & simplify fractions
Square Root Calculator
Square, cube & nth roots
GCD & LCM Calculator
Greatest common divisor & LCM
Age Calculator
Exact age from date of birth
Date Difference
Days between two dates
Working Days Calculator
Business days between dates
Time Zone Converter
Convert between time zones
Days Until Calculator
Countdown to any future date
Savings Goal Calculator
Monthly savings to reach a goal
Retirement Calculator
Retirement savings planning
ROI Calculator
Return on investment percentage
Inflation Calculator
Purchasing power over time
Car Loan Calculator
Auto loan monthly payments
Credit Card Payoff
Debt payoff timeline & interest
Salary to Hourly
Convert salary ↔ hourly rate
Tax Bracket Calculator
Federal income tax estimate
Net Worth Calculator
Assets minus liabilities
Break-Even Calculator
Sales needed to cover costs
Discount Calculator
Sale price after discount
Profit Margin Calculator
Gross & net profit margins
Macro Calculator
Daily protein, carbs & fat
Water Intake Calculator
Daily water requirement
Heart Rate Zone
Training heart rate zones
BAC Calculator
Blood alcohol level estimate
Sleep Calculator
Optimal sleep & wake times
One Rep Max (1RM)
Estimate max lift weight
Running Pace Calculator
Pace, distance & finish time
Protein Intake Calculator
Daily protein recommendation
Waist-to-Hip Ratio
WHR health risk assessment
BMR Calculator
Calories burned at rest
Body Type Calculator
Ecto, meso or endomorph
Lean Body Mass
Weight without body fat
Ovulation Calculator
Fertile window & ovulation date
Exponent Calculator
Powers & exponents (xⁿ)
Logarithm Calculator
Log base 10, ln & custom base
Standard Deviation
Mean, variance & std deviation
Quadratic Equation Solver
Solve ax² + bx + c = 0
Matrix Calculator
Matrix operations & determinant
Pythagorean Theorem
Right triangle side calculator
Prime Factorization
Decompose into prime factors
Binary Converter
Binary ↔ decimal ↔ hex
Combinations & Permutations
nCr, nPr & probability
Area Calculator
Area of any geometric shape
Volume Calculator
Volume of 3D shapes
Ratio Calculator
Simplify & solve ratios
Random Number Generator
Generate random numbers
Unix Timestamp Converter
Unix epoch ↔ readable date
Week Number Calculator
ISO week number lookup
Date Add/Subtract
Add/subtract days from a date
Time Duration Calculator
Duration between two times
Hours Calculator
Add/subtract hours & minutes
Military Time Converter
12-hour ↔ 24-hour time
Leap Year Calculator
Check leap years
Time Card Calculator
Weekly timesheet & overtime
Countdown Timer
Custom countdown with alert
World Clock
Current time worldwide
Age in Days Calculator
Total days since birth
Quarter Calculator
Fiscal & calendar quarters
Excavation Calculator
Dig volume & soil removal
Paint Calculator
Paint coverage & gallons needed
Concrete Calculator
Concrete volume & bags needed
Gravel Calculator
Gravel volume & tonnage
Tile Calculator
Tiles needed with waste factor
Brick Calculator
Bricks, mortar & wall area
Drywall Calculator
Drywall sheets & materials
Roofing Calculator
Roofing squares & materials
Lumber Calculator
Board feet & lumber costs
Insulation Calculator
R-value & insulation rolls
Flooring Calculator
Flooring area & waste factor
Fence Calculator
Posts, rails & materials
Deck Calculator
Boards, joists & screw count
Staircase Calculator
Steps, rise & run dimensions
Asphalt Calculator
Asphalt tonnage & coverage
Mulch Calculator
Mulch volume & bags needed
Retaining Wall Calculator
Blocks & backfill needed
Rebar Calculator
Rebar spacing & weight
Topsoil Calculator
Soil volume & delivery loads
Plywood Calculator
Plywood sheets & coverage
Gutter Calculator
Gutter length & downspouts
Wallpaper Calculator
Wallpaper rolls & coverage
Pool Volume Calculator
Pool gallons & fill time
Drop Ceiling Calculator
Ceiling tiles & grid materials
Paver Calculator
Paver count & base materials
Length Converter
Meters, feet, miles & more
Weight Converter
Kg, lbs, oz & grams
Temperature Converter
Celsius, Fahrenheit & Kelvin
Speed Converter
Mph, km/h, knots & m/s
Volume Converter
Liters, gallons, cups & ml
Area Converter
Sq ft, sq m, acres & hectares
Pressure Converter
PSI, bar, Pascal & atm
Energy Converter
Joules, calories, kWh & BTU
Data Storage Converter
Bytes, KB, MB, GB & TB
Time Unit Converter
Seconds to hours, days & years
Fuel Economy Converter
MPG, L/100km & km/L
Angle Converter
Degrees, radians & gradians
Power Converter
Watts, kW & horsepower
Frequency Converter
Hz, kHz, MHz & GHz
Force Converter
Newtons, lbf & kgf
Cooking Converter
Cups, tbsp, tsp & ml
Torque Converter
Nm, ft-lb & in-lb
Density Converter
Kg/m³, lb/ft³ & g/cm³
Flow Rate Converter
L/min, GPM & m³/h
Illuminance Converter
Lux, foot-candles & phot