Free Online Calculators

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

505 Calculators 18 Categories 100% Free

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100 Calculators

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Return on Equity (ROE) Calculator

#1

Calculate how efficiently a company generates profit from shareholders' equity.

Financial Calculators 4 variants

Circle Calculator

Calculate circle area and circumference from radius.

Math Calculators 5 variants

Ovulation Day Estimator

Estimates the ovulation day based on menstrual cycle length and luteal phase length.

Health & Fitness 5 variants

Future Value of Growing Annuity Calculator

Calculates the future value of a series of payments that grow at a constant rate.

Financial Calculators 4 variants

Mass-Spring Natural Frequency Calculator

Calculates the natural oscillation frequency of a mass-spring system using the standard physics formula.

Science & Engineering 4 variants

Free Testosterone Index (FTI) Calculator

Estimates the Free Testosterone Index (FTI) using total testosterone and SHBG levels.

Health & Fitness 5 variants
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505 total
Medication Dosage Calculator Calculates the total medication dose based on body weight and prescribed dosage...
Health & Fitness
EN
Elastic Potential Energy Calculator Calculates the elastic potential energy stored in a stretched or compressed spri...
Science & Engineering
EN
Coffee to Water Ratio Calculator Calculate the required amount of water based on coffee grounds and desired brew...
Cooking & Nutrition
EN
Shock Index Calculator Estimates hemodynamic stability using heart rate and systolic blood pressure.
Health & Fitness
EN
Batting Average Calculator Calculate a baseball or softball player's batting average.
Sports & Performance
EN
Total Interest Paid Calculator Calculates the total interest paid over the full term of a loan based on loan am...
Financial Calculators
EN
Aspect Ratio Calculator Calculates the numeric aspect ratio of a rectangle by dividing width by height.
Math Calculators
EN
Monthly Savings Allocation Calculator (50/30/20 Rule) Calculate how much money to set aside for savings each month based on a chosen s...
Financial Calculators
EN
Arterial Oxygen Content (CaO₂) Calculator Calculates the total arterial oxygen content based on hemoglobin, oxygen saturat...
Chemistry & Biology
EN
Corrected Serum Sodium Calculator (Hyperglycemia) Estimates corrected serum sodium in patients with hyperglycemia using a standard...
Health & Fitness
EN
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