Free Online Calculators

From BMI to loans, tips to age — instant calculations at your fingertips.

327 Calculators 16 Categories 100% Free

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Air Changes Per Hour (ACH) Calculator

#1

Calculate how many times the air in a room is replaced per hour based on airflow and room dimensions.

Construction & Home 4 variants

EBITDA Margin Calculator

Calculate a company's EBITDA margin as a percentage of total revenue.

Business & Retail 4 variants

Target Heart Rate Calculator (Karvonen Formula)

Calculate your target heart rate for exercise using the Karvonen formula based on maximum heart rate, resting heart rate, and exercise intensity.

Health & Fitness 4 variants

Kinetic Energy Calculator (KE=½mv²)

Calculate kinetic energy from mass and velocity using KE=½mv². Perfect for physics and mechanics.

Science & Engineering 5 variants

Urine Protein-to-Creatinine Ratio (UPCR) Calculator

Calculates the Urine Protein-to-Creatinine Ratio (UPCR) to assess kidney function and proteinuria.

Health & Fitness 4 variants

Solar Panel Energy Production Calculator

Calculate the total electricity generated by a solar panel system over a given period.

Science & Engineering 4 variants
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327 total
Gear Ratio Calculator Calculate the gear ratio between two gears based on their number of teeth.
Science & Engineering
EN
Pregnancy Weight Gain Calculator Estimates a woman's target weight during pregnancy based on pre-pregnancy weight...
Health & Fitness
EN
Real Wage Increase Calculator Calculates your real wage increase after accounting for inflation to show the tr...
Financial Calculators
EN
Fibonacci Retracement Level Calculator Calculates a single Fibonacci retracement price level based on a given price swi...
Financial Calculators
EN
Target Heart Rate Calculator (Karvonen Formula) Calculate your target heart rate for exercise using the Karvonen formula based o...
Health & Fitness
EN
Savings Rate Calculator Calculates the percentage of monthly income that is saved.
Financial Calculators
EN
Inflation-Adjusted Salary Calculator Calculate the real (inflation-adjusted) value of a nominal annual salary based o...
Financial Calculators
EN
Fat-Free Mass Index (FFMI) Calculator Estimates muscularity level based on body weight, body fat percentage, and heigh...
Health & Fitness
EN
Surface Speed Calculator Calculates the surface (linear) speed at the outer edge of a rotating object usi...
Science & Engineering
EN
Protein Calorie Percentage Calculator Calculates the percentage of total daily calories that come from protein.
Health & Fitness
EN
Full-Time Equivalent (FTE) Calculator Calculates the number of full-time equivalent employees based on total hours wor...
Business & Retail
EN
Household Electricity Carbon Footprint Calculator Estimates the monthly carbon emissions based on household electricity usage and...
Science & Engineering
EN