Calculator tools
41 free calculator tools, all running in your browser.
Absolute Difference Calculator
Calculate the absolute difference between two numbers with percentage comparisons and midpoint analysis.
Age Calculator
Calculate your exact age in years, months and days from your date of birth.
Aspect Ratio Calculator
Calculate aspect ratios, simplify dimensions, and solve for missing width or height with a live visual preview.
Average Calculator
Calculate the mean (average) of any set of numbers instantly, including spread and uncertainty.
BMI Calculator
Instantly calculate your Body Mass Index with metric or imperial units, WHO or Asian standards, plus BMI Prime, healthy weight range, ideal weight, and Ponderal Index.
BMR & TDEE Calculator
Calculate your Basal Metabolic Rate and daily calorie needs for weight loss, gain, or maintenance.
Break‑Even Calculator
Instantly calculate your break‑even point, target profit units, and margin of safety.
Business Days Calculator
Calculate business days between dates, add/subtract working days, and exclude custom weekends & holidays. Instant, free online tool with detailed breakdowns.
Calorie Calculator – Free TDEE, BMR & Macro Calculator for Weight Loss or Gain
Calculate your daily calorie needs for weight loss, maintenance, or muscle gain. Get personalized BMR, TDEE, and macro splits (protein, carbs, fats) with safety warnings.
CSS Border Radius Generator - Create Rounded Corners & Blob Shapes
Free online CSS border-radius generator with live preview. Create rounded corners, circles, pill shapes, and organic blob shapes with per-corner control. Copy CSS & Tailwind code instantly.
Date Calculator
Calculate days between dates, add or subtract durations, and find exact age from a birthday — with business days and full breakdowns.
Days Between Dates Calculator
Calculate the exact number of days, weeks, months, and years between two dates with support for inclusive/exclusive counting, custom weekends, and holiday exclusions.
DPI Calculator – PPI, Print DPI & Screen Density
Calculate screen PPI, print DPI, dot pitch, and retina distance instantly from any resolution.
Fraction Calculator
Perform arithmetic operations on proper, improper, and mixed fractions with instant step-by-step solutions.
Fuel Cost Calculator
Calculate fuel cost for any trip using km or miles, MPG, L/100km, or km/L with support for multiple currencies and fuel types
GPA Calculator
Calculate semester, cumulative, and target GPA with weighted courses (Honors/AP). Instant results, no signup.
Habit Streak Counter
Track daily habit streaks, missed days, and completion consistency at a glance.
HEX ↔ RGB Converter
Convert colors instantly between HEX, RGB, and RGBA formats with real-time smart detection and WCAG contrast diagnostics.
Hourly Wage Calculator
Instantly convert hourly, daily, weekly, monthly, and yearly pay — with overtime and unpaid time off built in.
Margin Calculator: Calculate Profit Margin, Markup & Selling Price
Free online margin calculator to compute profit margin, markup, selling price, and cost in real-time. Compare against 30+ industry benchmarks.
Mean Calculator
Calculate arithmetic, geometric, harmonic, and trimmed means instantly with full descriptive statistics.
Median and Mode Calculator
Calculate the median and mode of a dataset instantly with real-time updates and smart input parsing.
Meeting Cost Calculator
Calculate the true cost of meetings with multiple attendee groups, overhead, focus recovery time, and annual projections.
Online Stopwatch Timer – Free Digital Stop Watch with Laps
Free online stopwatch timer with lap splitting, millisecond precision, and session persistence. Perfect for sports, study, workouts, and timing tasks.
Percentage Calculator
Work out percentages three ways: X% of Y, X as a % of Y, and percentage increase or decrease.
Percentage Increase/Decrease Calculator
Calculate percentage increase, decrease, percent change, and reverse values instantly.
PPI Calculator – Pixels Per Inch for Monitors, Phones & Screens
Calculate PPI (Pixels Per Inch) for any screen or monitor. Compare pixel density, dot pitch, and optimal viewing distance for gaming, productivity, or design.
Probability Calculator
Calculate probabilities for events, unions, intersections, Bayes’ theorem, and repeated trials.
Proportion Calculator
Solve proportions, find missing values, and verify ratios with direct or inverse proportion support.
Ratio Calculator
Simplify ratios, solve proportions, scale ratios, and convert to percentages with instant results and visuals.
Resolution Calculator
Calculate screen resolution details, aspect ratio, PPI, print size, and scale dimensions instantly.
Salary Calculator
Convert salary across pay periods and estimate accurate take-home pay with taxes and deductions.
Scientific Calculator
Free online scientific calculator with support for trigonometry, logarithms, exponents, and complex expressions.
Standard Deviation Calculator
Calculate standard deviation, variance, mean, median, range, and other descriptive statistics for sample and population datasets.
Time Duration Calculator
Calculate the exact duration between two dates and times, with options to exclude weekends for business days.
Time Zone Converter
Convert time between time zones with DST-aware offsets, date shifts, and quick source/target swapping.
Timestamp Converter - Unix Epoch to Date & Vice Versa
Free online Unix timestamp converter. Instantly convert epoch timestamps (seconds & milliseconds) to readable dates in UTC and local time, and vice versa.
Tip Calculator & Bill Splitter
Instantly calculate your tip, split the bill evenly, or itemize costs perfectly among friends.
VAT Calculator
Calculate VAT, net, and gross amounts instantly.
Week Number Calculator
Find the week number for any date — or look up the exact dates for any week — using ISO 8601, US, or Simple systems.
Work Hours Calculator
Calculate work hours, break deductions, overtime, weekly totals, and overnight shifts instantly online.