Free Online Calculators
Free online calculators covering finance, health, math and more. All calculations run in your browser, no login required.
- Loan Payment Calculator
- Compound Interest Calculator
- Simple Interest Calculator
- Savings / Annuity Calculator
- ROI Calculator
- CAGR Calculator
- Discount Calculator
- Tip Calculator
- Sales Tax / VAT Calculator
- Inflation Calculator
- BMI Calculator
- BMR Calculator
- TDEE Calculator
- Ideal Weight
- Body Fat % (US Navy)
- Max Heart Rate
- Target Heart Rate
- Daily Water Intake
- Waist-to-Hip Ratio
- Blood Alcohol (BAC)
- Percentage Calculator
- Percentage Change Calculator
- Average Calculator
- Median Calculator
- GCD & LCM Calculator
- Pythagorean Theorem Calculator
- Circle Calculator
- Triangle Area Calculator
- Rectangle Calculator
- Cylinder Calculator
- Age Calculator
- Date Difference Calculator
- Time Difference Calculator
- Work Hours Calculator
- GPA Calculator
- Final Grade Calculator
- Height Converter
- Concrete Calculator
- Temperature Converter
- Length Converter
Guides
- Counting Days: Contracts, Schedules and Age Use Different Rules
Inclusive endpoints, calendar versus business days, month borrowing, time zones and DST — the four conventions behind most counting disputes.
- Nominal versus Real Returns: What Inflation Actually Takes
Use the Fisher relation to get real purchasing-power growth, see why "7% − 3% = 4%" is wrong, and how fees and taxes compound the gap.
- Running Pace and Heart-Rate Zones: Setting Training Intensity
Connect pace, max heart rate and heart-rate reserve; explain 80/20 training, cardiac drift and why race pace should not be every run.