All Calculators
Browse our complete collection of 30 free online tools and calculators. No accounts, no advertisements — just fast, private, and precise computations.
Math
Scientific Calculator
Trig, logs, powers, memory, history & scientific notation.
Percentage Calculator
Calculate percentages, increases, decreases & differences.
Loan Calculator
Estimate monthly payments, interest, and total repayment for an amortized loan.
Mortgage Calculator
Estimate monthly mortgage payments including taxes and insurance.
Compound Interest Calculator
Project investment growth with compounding and recurring monthly contributions.
Simple Interest Calculator
Calculate interest earned and final balance using the simple interest formula.
Salary Calculator
Convert hourly and annual salary into weekly, monthly, and yearly pay.
Fraction Calculator
Add, subtract, multiply, or divide fractions and simplify the result.
Triangle Calculator
Solve triangle sides, angles, area, and perimeter from known values.
Standard Deviation Calculator
Calculate mean, variance, and population/sample standard deviation from a list.
Health
Sleep Calculator
Optimize bedtimes, wake times, naps & sleep quality.
BMI Calculator
Body Mass Index with health category & recommendations.
Calorie Calculator
Estimate daily calorie needs from body metrics and activity level.
Body Fat Calculator
Estimate body fat percentage using the US Navy formula.
BMR Calculator
Estimate your basal metabolic rate using the Mifflin-St Jeor equation.
Ideal Weight Calculator
Find an ideal weight range using multiple body-weight formulas.
Time
Age Calculator
Exact age, zodiac signs, birthday countdown & age comparison.
Date Difference
Calculate the exact difference between two dates.
Stopwatch
Precision stopwatch with lap times.
Timer
Countdown timer with presets and notifications.
Pomodoro Timer
Focus sessions with work/break cycles.
Hours Calculator
Compute total hours worked between two times, including breaks.