All Calculators

65 precision tools, free and private.

💰 Finance

Compound Interest Calculator

Project how savings grow with compounding returns over time.

Savings Goal Calculator

Find how long it takes to reach a target balance with monthly deposits.

Inflation Calculator

See how inflation erodes purchasing power over time.

Budget Breakdown Calculator

Split income into needs, wants, and savings using the 50/30/20 guide.

🏠 Mortgage

Mortgage Payment Calculator

Estimate monthly principal and interest on a home loan.

Home Affordability Calculator

Estimate a comfortable home price from income and debts.

Amortization Schedule Calculator

View how each payment splits between principal and interest.

Refinance Break-Even Calculator

Find when refinancing savings exceed closing costs.

📈 Investment

ROI Calculator

Measure percentage return on an investment over any period.

CAGR Calculator

Compute smoothed annual growth between two values.

Portfolio Return Calculator

Blend weighted returns across multiple holdings.

🧾 Tax

Income Tax Estimator

Rough federal tax estimate from taxable income and filing status.

Sales Tax Calculator

Add or remove sales tax from a purchase price.

Capital Gains Calculator

Estimate tax on investment sale profits.

🏦 Loan

EMI Calculator

Calculate equated monthly installments for any term loan.

Debt Payoff Calculator

Plan how extra payments eliminate debt faster.

Auto Loan Calculator

Estimate car payment from price, down payment, and APR.

❤️ Health

Calorie Needs Calculator

Estimate daily calories using Mifflin-St Jeor BMR and activity level.

Body Fat Calculator

Estimate body fat percentage from circumference measurements.

Daily Water Intake Calculator

Suggest daily fluid intake from weight and activity.

🏃 Fitness

Running Pace Calculator

Convert speed, pace, distance, and time for runs.

One Rep Max Calculator

Estimate 1RM from submaximal weight and reps.

Target Heart Rate Calculator

Find training zones from age and resting heart rate.

⚖️ BMI

BMI Calculator

Compute body mass index from height and weight.

Ideal Weight Calculator

Estimate healthy weight range from height and frame.

Waist-to-Height Ratio Calculator

Assess central adiposity with a simple ratio.

🤰 Pregnancy

Due Date Calculator

Estimate delivery date from last menstrual period.

Ovulation Calculator

Predict fertile window from cycle length.

Pregnancy Week Calculator

See current gestational week and trimester.

📅 Date & Time

Date Difference Calculator

Count days, weeks, and months between two dates.

Date Addition Calculator

Add or subtract days, weeks, or months from a date.

Business Days Calculator

Count weekdays between dates excluding weekends.

🎂 Age

Age Calculator

Get exact age in years, months, and days.

Birthday Countdown Calculator

See days until your next birthday.

Half Birthday Calculator

Find the date halfway between your birthdays.

％ Percentage

Percentage Change Calculator

Measure percent increase or decrease between values.

Discount Calculator

Find sale price and savings from percent off.

Tip Calculator

Split bill with tip and per-person totals.

🔢 Math

Fraction Calculator

Add, subtract, multiply, and divide fractions.

Quadratic Equation Calculator

Solve ax² + bx + c = 0 with the quadratic formula.

Prime Number Calculator

Test primality and list primes in a range.

📊 Statistics

Mean Median Mode Calculator

Summarize a dataset with central tendency measures.

Standard Deviation Calculator

Measure spread with sample or population SD.

Z-Score Calculator

Standardize values to compare across scales.

📐 Geometry

Circle Area Calculator

Compute area and circumference from radius or diameter.

Triangle Area Calculator

Find area from base and height or three sides.

Cylinder Volume Calculator

Calculate volume of a right circular cylinder.

🔨 Construction

Concrete Calculator

Estimate cubic yards for slabs, footings, and pads.

Paint Coverage Calculator

Estimate gallons needed for walls and ceilings.

Flooring Calculator

Compute material boxes with waste allowance.

⚙️ Engineering

Ohm's Law Calculator

Solve voltage, current, and resistance relationships.

Beam Load Calculator

Estimate max bending moment for a simply supported beam.

Pipe Flow Calculator

Estimate flow velocity from diameter and flow rate.

🔄 Unit Conversion

Length Conversion Calculator

Convert between meters, feet, inches, and miles.

Weight Conversion Calculator

Switch between kilograms, pounds, and ounces.

Temperature Conversion Calculator

Convert Celsius, Fahrenheit, and Kelvin.

💱 Currency Conversion

Currency Converter Calculator

Convert amounts between major world currencies.

Travel Budget Currency Calculator

Split a trip budget across daily expenses in local currency.

Cross Rate Calculator

Derive exchange rate between two non-USD currencies.

🔬 Scientific Tools

Scientific Notation Calculator

Convert numbers to and from scientific notation.

Logarithm Calculator

Compute log base 10, natural log, or custom base.

Exponent Calculator

Raise numbers to integer or fractional powers.

🎓 Education Tools

GPA Calculator

Compute semester or cumulative GPA from grades.

Grade Average Calculator

Average numeric scores with optional weights.

Final Exam Grade Calculator

Find the score needed on a final to hit a target grade.