Calculate anything.
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Professional-grade calculators for construction, finance, health & everyday math. Free, instant results.
🏗️Construction Calculators
View all →Concrete Calculator
Estimate cubic yards of concrete needed
Lumber Calculator
Board feet & framing estimates
Paint Calculator
Gallons needed for your project
Tile & Flooring
Square footage with waste factor
Drywall Calculator
Sheets, mud & tape estimates
Mulch Calculator
Cubic yards for landscaping
Gravel Calculator
Tons & cubic yards needed
Roofing Calculator
Squares & shingles estimate
Fence Calculator
Posts, rails & materials
Insulation Calculator
R-value & material needs
Pool Volume Calculator
Calculate gallons for any pool shape
💰Finance Calculators
View all →Loan Calculator
Monthly payments & total interest
Mortgage Calculator
Home loan payment breakdown
Compound Interest Calculator
Watch your money grow over time
Salary Converter
Annual ↔ hourly ↔ monthly breakdown
Tip Calculator
Split bills & calculate tips fast
ROI Calculator
Return on investment percentage
Amortization Calculator
Loan schedule & extra payments
Inflation Calculator
Purchasing power over time
Paycheck Calculator
Net pay after taxes
Debt Payoff Calculator
Payoff timeline & interest savings
Retirement Calculator
Project your retirement savings
Auto Loan Calculator
Car payment & total cost
Gas Mileage Calculator
MPG, cost per mile & efficiency
Sales Tax Calculator
Tax amount & total price calculator
Income Tax Calculator
Federal tax estimate & brackets
Savings Goal Calculator
How long to reach your savings goal
Lease Calculator
Monthly car lease payment estimate
Net Worth Calculator
Calculate total assets minus liabilities
💪Health & Fitness Calculators
View all →BMI Calculator
Body mass index & healthy range
Calorie Calculator
Daily calories & TDEE
Body Fat Calculator
Body fat % using Navy method
Due Date Calculator
Pregnancy due date & week tracker
Macro Calculator
Protein, carbs & fat targets
Sleep Calculator
Optimal bedtime & wake times
Ovulation Calculator
Predict fertile window & ovulation date
🧮Everyday Calculators
View all →Scientific Calculator
Advanced math with trig & logarithms
Age Calculator
Exact age in years, months & days
Grade Calculator
Weighted grades & what you need
Percentage Calculator
Percentages, changes & comparisons
Square Footage Calculator
Area for any shape in sq ft
Date Calculator
Days between dates & add/subtract
Discount Calculator
Sale price & savings instantly
Hours Calculator
Add & subtract time, track work hours
Fraction Calculator
Add, subtract, multiply & divide fractions
GPA Calculator
Calculate cumulative GPA from grades
Unit Converter
Convert length, weight, volume & more
Time Zone Converter
Convert times across world time zones
Random Number Generator
Generate random numbers, names & more
Probability Calculator
Calculate odds, combinations & permutations
📅Date & Time Calculators
View all →Date Calculator
Add or subtract days, weeks, months, years
Days Between Dates
Calculate days, weeks, months between dates
Time Duration Calculator
Calculate time between two times
Time Calculator
Add or subtract hours, minutes, seconds
Business Days Calculator
Count working days between dates
Business Date Calculator
Add or subtract business days
Weekday Calculator
Find the day of the week for any date
Week Number Calculator
Find ISO week number for any date
Roman Numeral Converter
Convert to and from Roman numerals
Age Calculator
Exact age with milestones & time alive
Date Pattern Calculator
Find palindrome & special dates
Countdown Calculator
Live countdown to any date
Time Zone Converter
Convert times across world time zones
Meeting Planner
Find best meeting times across zones
Sunrise & Sunset Calculator
Sunrise, sunset & day length times
Moon Phase Calculator
Current moon phase & full moon dates