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Browse simple calculators and planning tools for finance, home, health, math, conversions, everyday life, and science.

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Finance4 tools Home3 tools Health3 tools Math4 tools Convert2 tools Life3 tools Science3 tools

Finance

Loans, interest, salary, and money planning tools.

4 tools

Loan Calculator

Estimate monthly payment, total interest, and total payoff for a fixed loan.

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Compound Interest Calculator

Project growth from a starting balance, recurring contributions, and interest.

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Inflation Calculator

Compare the value of money across years using U.S. CPI annual averages.

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Paycheck / Salary Calculator

Estimate gross pay, taxes, deductions, and take-home pay by pay period.

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Home

Home buying and housing cost calculators.

3 tools

Mortgage Calculator

Estimate mortgage payments with taxes, insurance, HOA, and PMI.

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Home Affordability Calculator

Estimate how much house may fit your income, debts, and DTI target.

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Rent vs Buy Calculator

Compare the long-term cost of renting with buying a home.

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Health & Fitness

Simple body, nutrition, and fitness estimate tools.

3 tools

BMI Calculator

Calculate body mass index and see the general BMI category.

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Calorie Calculator

Estimate BMR, daily calorie needs, and goal-based calorie targets.

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TDEE Calculator

Estimate BMR, TDEE, maintenance calories, and goal-based calorie targets.

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Math

Everyday arithmetic, percentages, fractions, and scientific helpers.

4 tools

Basic Calculator

Handle quick arithmetic, percent, decimals, sign changes, memory, and keyboard input.

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Percentage Calculator

Solve percent of a number, percent share, and percent change.

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Scientific Calculator

Run advanced arithmetic, memory, powers, roots, logs, trigonometry, and constants.

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Fraction Calculator

Add, subtract, multiply, divide, and simplify fractions.

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Converters

Unit conversion tools for common measurements.

2 tools

Unit Converter

Convert common length, weight, volume, area, speed, and temperature units.

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Currency Converter

Convert between major currencies with direct and inverse exchange rates.

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Everyday Life

Useful calculators for school, time, and daily planning.

3 tools

Age Calculator

Calculate age in years, months, days, and total days lived.

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Date Duration Calculator

Count days between dates or add and subtract days from a date.

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GPA Calculator

Estimate GPA from course grades and credit hours.

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Science

Practical science formulas with editable inputs.

3 tools

Density Calculator

Calculate density from mass and volume using transparent unit choices.

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Molarity Calculator

Calculate molarity from solute amount, molar mass, and solution volume.

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Half-Life Calculator

Estimate remaining amount, percent remaining, decay, and target time by half-life.

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Planning note: Tools are estimates and educational tools. Important financial, health, academic, or scientific decisions should be confirmed with the right professional or source.