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.
15 calculators
Financial Calculators
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Financial
Mortgage Calculator
Estimate principal, interest, taxes, insurance, HOA dues, and full loan cost for a home purchase.
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Financial
Loan Calculator
Calculate loan payments and see how extra monthly principal changes payoff time and interest.
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Financial
Auto Loan Calculator
Model monthly payments, reverse-solve your budget, and inspect the full cost of a car deal.
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Financial
Interest Calculator
Project compound interest with recurring deposits and a selectable compounding schedule.
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Financial
Payment Calculator
Solve the periodic payment needed for a loan, savings goal, or future-value target.
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Financial
Retirement Calculator
Estimate retirement readiness by comparing projected savings to an income need in retirement.
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Financial
Amortization Calculator
Build a fast payoff summary with first-payment detail and extra-payment impact.
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Financial
Investment Calculator
Forecast investment growth, contributions, target progress, and required monthly savings.
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Financial
Inflation Calculator
Estimate how inflation changes future prices and today's purchasing power.
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Financial
Finance Calculator
Solve common time-value-of-money variables for loans, investments, and annuities.
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Financial
Income Tax Calculator
Estimate U.S. federal income tax, refund, or amount owed using 2025 and 2026 federal brackets.
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Financial
Compound Interest Calculator
Calculate compound growth with deposits and a clear split between principal, contributions, and interest.
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Financial
Salary Calculator
Convert pay frequencies, estimate hourly value, and approximate take-home pay.
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Financial
Interest Rate Calculator
Solve the implied APR from loan amount, monthly payment, and term.
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Financial
Sales Tax Calculator
Add or reverse sales tax with discounts and a clean before/after breakdown.
9 calculators
Fitness & Health Calculators
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Fitness & Health
BMI Calculator
Calculate BMI, category, and a healthy-weight range from height and weight.
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Fitness & Health
Calorie Calculator
Estimate maintenance calories and goal calories using BMR and activity level.
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Fitness & Health
Body Fat Calculator
Estimate body fat percentage with the U.S. Navy tape-measure method.
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Fitness & Health
BMR Calculator
Estimate basal metabolic rate and maintenance calories from body measurements.
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Fitness & Health
Ideal Weight Calculator
Compare common ideal-weight formulas and a BMI-based healthy range.
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Fitness & Health
Pace Calculator
Convert race time and distance into pace and speed across miles and kilometers.
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Fitness & Health
Pregnancy Calculator
Estimate due date, conception date, and trimester milestones from last menstrual period.
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Fitness & Health
Pregnancy Conception Calculator
Estimate conception date and likely fertile window from an expected due date.
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Fitness & Health
Due Date Calculator
Calculate pregnancy due date from last period, conception date, or IVF transfer date.
6 calculators
Math Calculators
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Math
Scientific Calculator
Evaluate a scientific expression with common functions and degree/radian angle modes.
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Math
Fraction Calculator
Add, subtract, multiply, or divide fractions with reduced and decimal results.
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Math
Percentage Calculator
Solve common percentage phrases, percentage change, and reverse-percentage questions.
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Math
Random Number Generator
Generate random integers or decimals with count, range, decimal precision, and uniqueness options.
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Math
Standard Deviation Calculator
Compute mean, variance, standard deviation, min, max, and count from a dataset.
10 calculators
Other Calculators
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Other
Age Calculator
Calculate exact age, total days lived, and next birthday from two dates.
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Other
Date Calculator
Find the difference between dates and add calendar or business days.
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Other
Time Calculator
Calculate elapsed time between clock times with breaks and optional rounding.
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Other
Hours Calculator
Total weekly work hours, overtime, and gross pay from daily hour entries.
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Other
Grade Calculator
Find the final exam score needed for a target course grade and preview projected grade.
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Other
Concrete Calculator
Estimate concrete volume, waste, bag count, and material cost for slabs or round columns.
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Other
Subnet Calculator
Calculate network address, mask, broadcast, host range, and usable host count.
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Other
Password Generator
Generate strong passwords with character-set controls and ambiguity filtering.
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Other
Conversion Calculator
Convert common length, weight, temperature, and volume units in one tool.