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Quick start
Choose a category — then open the calculator you need.
Popular calculators
High-intent tools people open first.
- Age CalculatorFree Age Calculator online — calculate exact age from date of birth in years, months, weeks, days, hours, minutes, and seconds.Open →
- Mortgage CalculatorFree mortgage calculator to estimate monthly principal and interest payments for a home loan.Open →
- BMI CalculatorFree BMI calculator to check body mass index from height and weight in metric or US units.Open →
- Calorie CalculatorDaily calorie calculator for weight loss, maintenance, or gain based on BMR and activity level.Open →
- Compound Interest CalculatorCalculate compound interest and future value with monthly contributions.Open →
- Due Date CalculatorPregnancy due date calculator using Naegele’s rule from the last menstrual period.Open →
- Loan CalculatorGeneral loan payment calculator for principal, rate, and term.Open →
- Macro CalculatorMacro calculator — convert calories and protein/carb/fat percentages into daily grams.Open →
Browse tools by category
Every calculator has its own page — search-friendly names, free to use.
Financial Calculators
Mortgage, loans, investing, retirement, taxes, credit, and more.
- Mortgage CalculatorMortgage · free · instant
- Amortization CalculatorAmortization · free · instant
- Mortgage Payoff CalculatorPayoff · free · instant
- House Affordability CalculatorAffordability · free · instant
- Rent CalculatorRent · free · instant
- Debt-to-Income Ratio CalculatorDTI · free · instant
- Real Estate CalculatorReal Estate · free · instant
- Refinance CalculatorRefinance · free · instant
- Rental Property CalculatorRental · free · instant
- APR CalculatorAPR · free · instant
- FHA Loan CalculatorFHA · free · instant
- VA Mortgage CalculatorVA · free · instant
Fitness & Health
BMI, calories, body fat, pace, heart rate, and training tools.
- BMI CalculatorBMI · free · instant
- Calorie CalculatorCalories · free · instant
- Body Fat CalculatorBody Fat · free · instant
- BMR CalculatorBMR · free · instant
- Ideal Weight CalculatorIdeal Weight · free · instant
- Pace CalculatorPace · free · instant
- Army Body Fat CalculatorArmy BF · free · instant
- Lean Body Mass CalculatorLBM · free · instant
- Healthy Weight CalculatorHealthy Weight · free · instant
Pregnancy
Due dates, ovulation, conception, and pregnancy progress tools.
- Pregnancy CalculatorPregnancy · free · instant
- Pregnancy Weight Gain CalculatorPregnancy Gain · free · instant
- Pregnancy Conception CalculatorConception Date · free · instant
- Due Date CalculatorDue Date · free · instant
- Ovulation CalculatorOvulation · free · instant
- Conception CalculatorConception · free · instant
Nutrition & Body
Macros, TDEE, protein, GFR, BSA, and related estimators.
- Macro CalculatorMacros · free · instant
- Carbohydrate CalculatorCarbs · free · instant
- Protein CalculatorProtein · free · instant
- Fat Intake CalculatorFat Intake · free · instant
- TDEE CalculatorTDEE · free · instant
- GFR CalculatorGFR · free · instant
- Body Type CalculatorBody Type · free · instant
- Body Surface Area CalculatorBSA · free · instant
Calculators
Date, age, and everyday math utilities that answer fast.
Text Tools
Count, transform, and clean writing with free text utilities.
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Private by design
Math runs in your browser. No account wall for core calculators.
US-ready defaults
Imperial units and American English where health tools need them.
From the blog
Diet plans and guides that link back to free calculators.
New U.S. Dietary Guidelines 2025–2030: a simple eating plan Americans can actually follow
Federal nutrition guidance just got a loud “eat real food” reset. Here’s what it means for your plate, protein, and calories — plus free calculators to personalize the plan.
High-protein diet plan for Americans: how much you need and what to eat
U.S. guidance now highlights higher protein targets. Here’s a practical day of eating, grocery list ideas, and a free protein calculator so you’re not guessing grams.
7-day American diet plan for weight loss (realistic, grocery-store food)
A week of U.S.-style meals that still feel like food — breakfasts, lunches, dinners, and snacks — built around a calorie target you can calculate free online.
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