29 TOOLSCalculators & Converters

Free Online Calculators

Tip calculators, BMI, loan, percentage, unit converters — everything you need for everyday maths and conversions.

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Calculators & Converters

All Calculators

29 free calculators and converters for everyday maths and measurements.

Tip Calculator
Split bills and calculate tips across any number of people.
  • Custom tip percentage
  • Split between any number of people
  • Per-person totals
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BMI Calculator
Body mass index calculator — metric and imperial units.
  • Metric and imperial modes
  • BMI category classification
  • Healthy weight range
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Percentage Calculator
5 types of percentage calculations in one tool.
  • What is X% of Y?
  • X is what % of Y?
  • Percentage change calculator
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Age Calculator
Exact age with zodiac sign and next birthday countdown.
  • Years, months, days breakdown
  • Zodiac sign lookup
  • Days until next birthday
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Discount Calculator
Find sale price and savings instantly from any discount.
  • Original and sale price calc
  • Percentage discount finder
  • Savings amount display
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Unit Converter
Convert between length, weight, temperature, speed, and more.
  • 20+ unit categories
  • Real-time conversion
  • All common units supported
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Loan Calculator
Calculate monthly payments, total interest, and amortization.
  • Monthly payment breakdown
  • Total interest paid
  • Full amortization schedule
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Time Zone Converter
Convert times between any time zones worldwide.
  • All world time zones
  • DST-aware conversions
  • Multiple zone comparison
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Date Difference
Calculate days, weeks, months between any two dates.
  • Days, weeks, months, years
  • Business days option
  • Future date calculator
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Salary Calculator
Convert hourly to annual salary and vice versa instantly.
  • Hourly to annual conversion
  • Monthly and weekly rates
  • Overtime calculation
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Compound Interest
Calculate investment growth with compound interest over time.
  • Principal and rate inputs
  • Monthly or annual compounding
  • Growth chart visualisation
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GPA Calculator
Calculate GPA from course grades and credit hours.
  • Add multiple courses
  • Weighted GPA calculation
  • 4.0 scale support
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Calorie Calculator
Calculate BMR and TDEE from age, height, weight and activity.
  • BMR using Mifflin-St Jeor
  • Activity level multiplier
  • Weight goal calorie targets
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Pomodoro Timer
Focus timer with work and break intervals.
  • 25/5 Pomodoro intervals
  • Custom timer lengths
  • Session counter
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Bitrate Calculator
Calculate bitrate, file size, and recording duration.
  • Bitrate to file size
  • Duration from file size
  • Video and audio formats
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Aspect Ratio Calculator
Calculate resolutions and aspect ratios for any screen.
  • Width × height ratio calc
  • Common ratio presets
  • Scale any resolution
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Length Converter
Convert mm, cm, m, km, ft, inches, miles and more.
  • Metric and imperial
  • Instant conversion
  • All common length units
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Weight Converter
Convert grams, kg, lbs, oz, stones and more.
  • Metric and imperial units
  • Real-time conversion
  • Precise decimal output
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Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin and more.
  • Celsius, Fahrenheit, Kelvin
  • Rankine and Réaumur support
  • Instant conversion
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Volume Converter
Convert ml, litres, cups, gallons, fluid ounces and more.
  • Metric and imperial volumes
  • Cooking measurement support
  • Instant conversion
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Speed Converter
Convert mph, km/h, knots, mach and running pace.
  • mph, km/h, knots
  • Mach number conversion
  • Running pace calculator
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Tax Calculator
Estimate your income tax for the US, UK, Canada, and Australia with bracket-by-bracket breakdown.
  • 4 countries
  • 2026 tax brackets
  • Effective rate
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Investment Calculator
Project the growth of your investments over time with compound interest and monthly contributions.
  • Monthly contributions
  • Year-by-year table
  • Growth chart
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Advanced Mortgage Calculator
Calculate your full monthly mortgage payment including PMI, property tax, insurance, and HOA.
  • PMI auto-calculation
  • Amortization table
  • Full PITI breakdown
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Retirement Calculator
Project your retirement savings and see if you are on track to meet your financial goals.
  • 4% withdrawal rule
  • Employer match
  • Year projections
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Body Fat Calculator
Calculate body fat percentage using the US Navy method or BMI-based estimation.
  • Navy & BMI methods
  • Male & female formulas
  • Category chart
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Macro Calculator
Calculate your daily protein, carb, and fat targets based on your weight, activity, and goals.
  • 3 macro splits
  • 5 activity levels
  • Meal breakdown
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Water Intake Calculator
Calculate your optimal daily water intake based on weight, activity level, and climate.
  • Climate adjustment
  • Pregnancy option
  • Hourly schedule
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Fuel Cost Calculator
Estimate how much a road trip will cost in fuel, including per-person cost for groups.
  • MPG & L/100km
  • Round trip option
  • Per-person cost
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