Multi-category unit converter, loan amortization, percentages, BMI, GPA, and math calculators.
Convert across 10+ categories: Length, Weight, Temperature, Area, Volume, Speed, Energy, Pressure, Power, and Data Storage.
Convert between Celsius, Fahrenheit, Kelvin, and Rankine temperature scales.
Convert between metric and imperial length units (mm, cm, m, km, in, ft, yd, mi).
Convert between metric and imperial weight units (mg, g, kg, oz, lb, metric ton, US ton).
Convert between Liters, Milliliters, Gallons, Quarts, Pints, Cups, and Fluid Ounces.
Convert between km/h, mph, m/s, knots, and feet per second.
Convert between square meters, square feet, square yards, acres, hectares, and square miles.
Convert between Pascal (Pa), Bar, PSI, Standard Atmosphere (atm), and Torr.
Convert between Joules, Kilojoules, Calories, Kilocalories (kcal), kWh, and BTU.
Convert between Watts (W), Kilowatts (kW), Megawatts (MW), Horsepower (hp), and BTU/h.
Convert between Bytes, Kilobytes (KB), Megabytes (MB), Gigabytes (GB), Terabytes (TB), and Bits.
Calculate X% of Y, percentage increase/decrease, percentage difference, and ratio.
Calculate tip amount, total bill with gratuity, and split cost per person.
Calculate monthly loan payments, total interest paid, and full payoff summary.
Calculate monthly mortgage payments including principal, interest, property tax, and insurance.
Calculate investment compound growth over time with annual/monthly compounding.
Calculate net profit, percentage ROI, and annualized rate of return on investments.
Calculate cumulative college/high school GPA on a 4.0 weighted scale.
Calculate overall class grade and the required score on final exam to get target grade.
Calculate exact age in years, months, days, hours, and next birthday countdown.
Calculate BMI from height and weight, with WHO category classification.
Estimate Basal Metabolic Rate (BMR) and daily calorie needs for maintenance or weight goals.
Calculate final sale price and total money saved with single or stacked discounts.
Calculate gross profit, net margin percentage, and markup from cost and revenue.
Convert between markup percentage and profit margin percentage.
Is BMI Accurate? What the Number Misses
Is BMI accurate? It is reliable for populations and unreliable for individuals. Here is what BMI measures well, where it fails, and what to use alongside it.
What Is a Healthy BMI? The Ranges Explained
A healthy BMI range for adults is 18.5 to 24.9. See the full WHO BMI chart, what each category means, where the cut-offs come from, and how to read yours.
How Many Calories Do You Actually Need?
Daily calorie needs vary far more than the 2,000 kcal label figure suggests. See the general population ranges, what drives them, and how to estimate your own.
BMR vs TDEE: Understanding Your Calorie Baseline
BMR vs TDEE explained: BMR is what you burn at rest, TDEE is BMR times an activity factor. See both formulas, the multipliers, and worked examples.
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