Calculator hub

Free Online Calculators

A focused library of calculators for finance, health, math, dates, school, networking, passwords, and everyday conversions. Each calculator keeps its formula and assumptions close to the result so the answer is easier to trust.

Financial Fitness & Health Math Other

15 calculators

Financial Calculators

Financial

Mortgage Calculator

Estimate principal, interest, taxes, insurance, HOA dues, and full loan cost for a home purchase.

Financial

Loan Calculator

Calculate loan payments and see how extra monthly principal changes payoff time and interest.

Financial

Auto Loan Calculator

Model monthly payments, reverse-solve your budget, and inspect the full cost of a car deal.

Financial

Interest Calculator

Project compound interest with recurring deposits and a selectable compounding schedule.

Financial

Payment Calculator

Solve the periodic payment needed for a loan, savings goal, or future-value target.

Financial

Retirement Calculator

Estimate retirement readiness by comparing projected savings to an income need in retirement.

Financial

Amortization Calculator

Build a fast payoff summary with first-payment detail and extra-payment impact.

Financial

Investment Calculator

Forecast investment growth, contributions, target progress, and required monthly savings.

Financial

Inflation Calculator

Estimate how inflation changes future prices and today's purchasing power.

Financial

Finance Calculator

Solve common time-value-of-money variables for loans, investments, and annuities.

Financial

Income Tax Calculator

Estimate U.S. federal income tax, refund, or amount owed using 2025 and 2026 federal brackets.

Financial

Compound Interest Calculator

Calculate compound growth with deposits and a clear split between principal, contributions, and interest.

Financial

Salary Calculator

Convert pay frequencies, estimate hourly value, and approximate take-home pay.

Financial

Interest Rate Calculator

Solve the implied APR from loan amount, monthly payment, and term.

Financial

Sales Tax Calculator

Add or reverse sales tax with discounts and a clean before/after breakdown.

9 calculators

Fitness & Health Calculators

Fitness & Health

Calculate BMI, category, and a healthy-weight range from height and weight.

Fitness & Health

Calorie Calculator

Estimate maintenance calories and goal calories using BMR and activity level.

Fitness & Health

Body Fat Calculator

Estimate body fat percentage with the U.S. Navy tape-measure method.

Fitness & Health

Estimate basal metabolic rate and maintenance calories from body measurements.

Fitness & Health

Ideal Weight Calculator

Compare common ideal-weight formulas and a BMI-based healthy range.

Fitness & Health

Pace Calculator

Convert race time and distance into pace and speed across miles and kilometers.

Fitness & Health

Pregnancy Calculator

Estimate due date, conception date, and trimester milestones from last menstrual period.

Fitness & Health

Pregnancy Conception Calculator

Estimate conception date and likely fertile window from an expected due date.

Fitness & Health

Due Date Calculator

Calculate pregnancy due date from last period, conception date, or IVF transfer date.

6 calculators

Math Calculators

Math

Scientific Calculator

Evaluate a scientific expression with common functions and degree/radian angle modes.

Math

Fraction Calculator

Add, subtract, multiply, or divide fractions with reduced and decimal results.

Math

Percentage Calculator

Solve common percentage phrases, percentage change, and reverse-percentage questions.

Math

Random Number Generator

Generate random integers or decimals with count, range, decimal precision, and uniqueness options.

Math

Triangle Calculator

Solve area, perimeter, and angles from three side lengths.

Math

Standard Deviation Calculator

Compute mean, variance, standard deviation, min, max, and count from a dataset.

10 calculators

Other Calculators

Other

Calculate exact age, total days lived, and next birthday from two dates.

Other

Date Calculator

Find the difference between dates and add calendar or business days.

Other

Time Calculator

Calculate elapsed time between clock times with breaks and optional rounding.

Other

Hours Calculator

Total weekly work hours, overtime, and gross pay from daily hour entries.

Other

Calculate weighted GPA from course credits and letter grades.

Other

Grade Calculator

Find the final exam score needed for a target course grade and preview projected grade.

Other

Concrete Calculator

Estimate concrete volume, waste, bag count, and material cost for slabs or round columns.

Other

Subnet Calculator

Calculate network address, mask, broadcast, host range, and usable host count.

Other

Password Generator

Generate strong passwords with character-set controls and ambiguity filtering.

Other

Conversion Calculator

Convert common length, weight, temperature, and volume units in one tool.