Free Online Calculators

52 calculators across 10 categories. Each one is checked against a published formula or the original tool's own output.

Body & Measurements
6
BMI, body fat, and body-composition metrics from your measurements.

BMI Calculator · Body Fat %

Nutrition & Daily Habits
9
Calories, macros, hydration, and daily intake targets.

BMR & TDEE · Calorie Calculator

Clinical Risk Scores
6
Published, peer-reviewed clinical risk models and scoring tools.

Breast Cancer Risk (Gail Model) · Colorectal Cancer Risk

Pregnancy & Cycle
3
Due dates, ovulation windows, and cycle prediction.

Pregnancy Due Date · Ovulation Calculator

Loans & Housing
6
Mortgages, amortization schedules, and debt payoff strategies.

Mortgage Calculator · Mortgage Pro Estimator

Saving & Investing
7
Compound growth, retirement targets, and savings planning.

Investment Growth · Retirement Calculator

Income & Everyday Money
3
Take-home pay, tips, and recurring spend.

Take-Home Pay (US) · Tip Calculator

Home & Energy
5
Electricity costs, solar payback, and EV running costs.

Home Electricity Cost · Appliance Running Cost

Work & Business
4
Meeting costs, runway, and revenue calculators.

Meeting Cost Calculator · Time Savings / Automation ROI

Science & Lab
3
Solution chemistry and clinical lab-value unit conversions.

Molarity Calculator · Dilution Calculator

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