Free Online Calculators
Professional calculators for health, fitness, finance, and more. Get instant, accurate results on any device.
Health & Fitness
BMI Calculator
Free BMI calculator to check your body mass index instantly. Get personalized health recommendations based on your height and weight. Accurate & easy to use.
BMI Calculator for Women
Calculate adult BMI from height and weight in metric or imperial units. See standard BMI categories with practical guidance for women, age, pregnancy, and muscle mass.
BMI Calculator for Men
Accurate BMI calculator specifically designed for men. Calculate your body mass index with male-specific interpretations and health recommendations.
Teen BMI Calculator
Free BMI calculator specifically designed for teenagers. Calculate body mass index with age-appropriate percentiles and get personalized health recommendations for teens.
Athlete Body Composition Calculator
Comprehensive body composition calculator specifically designed for athletes. Calculate BMI, muscle mass, optimal weight ranges, and get performance-oriented…
BMI Calculator for Muscular Men
Calculate standard BMI for a muscular or athletic build. Learn why BMI can overstate body fat and when waist or body-fat measurements add useful context.
BMR Calculator
Free BMR calculator to estimate your basal metabolic rate instantly. Get personalized calorie recommendations based on your age, gender, weight, and height using…
BMR Calculator for Women
Estimate women's BMR with Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle. Compare resting calories with activity-adjusted daily needs.
BMR Calculator for Men
Estimate men's BMR with Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle. Compare resting calories with activity-adjusted daily needs.
Katch-McArdle Calculator
Calculate your BMR using the Katch-McArdle formula that considers body fat percentage. The most accurate method for athletes and those with known body composition.
Mifflin-St Jeor Calculator
Calculate your BMR using the Mifflin-St Jeor equation - the most accurate formula for basal metabolic rate. Get precise calorie estimates for weight management.
Harris-Benedict Calculator
Calculate your BMR using the original Harris-Benedict equation from 1919. Discover the historical formula that started metabolic rate calculations.
TDEE Calculator
Calculate your Total Daily Energy Expenditure (TDEE) with precision. Get personalized calorie recommendations for weight loss, gain, or maintenance based on your…
TDEE Calculator for Men
Calculate your Total Daily Energy Expenditure (TDEE) specifically for men. Get personalized calorie recommendations for weight loss, muscle gain, or maintenance based…
TDEE Calculator for Women
Estimate daily calories for women from BMR and activity level. Compare Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle and set a goal.
Daily Calorie Calculator
Calculate your daily calorie needs based on age, gender, activity level and weight goals. Get personalized nutrition recommendations and macro breakdowns.
Calorie Deficit Calculator
Free calorie deficit calculator to determine your daily calorie needs for weight loss. Get personalized recommendations based on your BMR, TDEE, and weight loss goals.…
Calorie Surplus Calculator
Free calorie surplus calculator to determine your daily calorie needs for healthy weight gain and muscle building. Get personalized bulking recommendations based on…
Weight Gain Calculator
Add a selected 0–500 kcal daily surplus to your current TDEE and view a clearly labeled static planning-rate equivalent for adults.
Macro Calculator
Calculate your optimal protein, carbs, and fat intake based on your goals. Free macronutrient calculator with personalized meal planning and recommendations.
Protein Calculator
Evidence-based protein calculator to determine your optimal daily protein intake. Personalized recommendations based on age, activity level, and health goals.
Body Fat Calculator
Free body fat calculator using Navy method and YMCA formula. Calculate your body fat percentage instantly with waist, neck, and hip measurements. Accurate & easy to use.
Navy Body Fat Calculator
Accurate Navy body fat calculator using the official US Navy formula. Calculate your body fat percentage with waist, neck, and hip measurements. Military-grade accuracy.
Waist-to-Hip Ratio Calculator
Calculate waist-to-hip ratio from same-unit measurements and compare it with clearly labeled sex-specific WHO population thresholds.
Lean Body Mass Calculator
Calculate lean body mass and fat mass from body weight and a measured body-fat percentage. Distinct from skeletal muscle mass estimates.
Ideal Weight Calculator
Calculate your ideal weight using multiple medical formulas. Get personalized recommendations based on height, gender, age, and body frame. Accurate & evidence-based.
Weight Loss Calculator
Free weight loss calculator with safe timeline planning. Calculate calories, target weight, and realistic timelines based on medical research. Healthy approach only.
Muscle Gain Calculator
Free muscle gain calculator to analyze your muscle-building potential using FFMI. Get personalized training and nutrition recommendations based on your genetic…
Muscle Mass Calculator
Calculate your muscle mass using proven medical formulas. Get personalized training and nutrition recommendations based on your muscle mass analysis. Accurate &…
Water Intake Calculator
Free water intake calculator to determine your optimal daily water consumption. Get personalized hydration recommendations based on your weight, activity, and climate.
Keto Macro Calculator
Calculate ketogenic diet macronutrients with medical safety warnings. Get personalized keto ratios with proper health supervision requirements.
Period Calculator
Project up to 12 future period start dates from the first day of your last period and your own average cycle length.
Heart Rate Zone Calculator
Calculate personalized heart rate training zones using the scientifically-validated Karvonen method. Optimize your workouts with accurate HR zones for fat burn…
Exercise Calculator
Estimate gross exercise energy expenditure from MET value, duration, and body mass with metric or imperial inputs and transparent assumptions.
Activity Tracker
Total up to three weekly activities as minutes and MET-minutes using your entered frequency, duration, and sourced MET assumptions.
Training Load Calculator
Calculate a single session-load record from session RPE multiplied by duration. No injury-risk, fatigue, or readiness prediction.
Step Counter
Convert steps and your measured stride length to kilometers or miles. Add duration for pace; no guessed calorie estimate.
Strength Training Calculator
Estimate gross resistance-training energy expenditure from a sourced Compendium MET intensity, body mass, and session duration.
Exercise Progression Calculator
Project your own starting load, repetitions, increment interval, weekly frequency, and plan length into a transparent week-by-week schedule.
Workout Split Calculator
Create a transparent 2–6 day weekly muscle-group rotation from your chosen training frequency and first workout day.
Pregnancy Weight Calculator
View educational singleton pregnancy weight-gain reference ranges by pre-pregnancy BMI and gestational week using CDC/IOM guidance.
Ovulation Calculator
Estimate an ovulation date and fertile window from your last period and average cycle length using an explicit 14-day luteal-phase assumption.
Finance
Mortgage Calculator
Estimate a fixed-rate home mortgage payment with optional monthly property tax, insurance and HOA assumptions. Uses no live rates or lender offers.
Loan Calculator
Estimate payments and total interest for a fixed-rate, fully amortizing loan using your own amount, rate and term. No live rates or approval estimates.
Home Equity Loan Calculator
Estimate home equity at an entered combined LTV and model a fixed-rate home equity loan payment without implying approval or eligibility.
Compound Interest Calculator
Calculate compound growth from principal, recurring contributions, timing, term, rate and compounding frequency using assumptions you enter.
Investment Calculator
Project investment growth, compare contributions with assumed gains, and optionally estimate inflation-adjusted value. No return is promised.
HELOC Calculator
Estimate HELOC interest-only draw payments and later repayment payments using an explicit constant-rate, fixed-draw scenario.
Refinancing Calculator
Compare an existing fixed-rate loan with a proposed refinance using remaining balance, closing costs, payment difference and simple break-even.
Student Loan Repayment Calculator
Estimate fixed-rate student loan payments, total interest and payoff time with an optional recurring extra payment.
Dividend Reinvestment Calculator
Model dividend reinvestment with a constant share price, constant yield, payout frequency and reinvestment percentage. Taxes and fees excluded.
Amortization Schedule Calculator
Generate a payment-by-payment principal, interest and remaining-balance schedule for a fixed-rate loan, including a cent-adjusted final payment.
Annuity Payout Calculator
Estimate a fixed payout from present value, term, rate and frequency. Compare ordinary and annuity-due timing; this is not an insurance quote.
Debt Snowball Calculator
Order debts by balance and simulate monthly minimums plus a fixed extra budget, with payoff order, interest and schedule.
Education
GPA Calculator
Calculate semester or cumulative GPA on 4.0, 4.3, 4.5, weighted 5.0, or percentage scales. Add course credits, letter grades, Honors, AP, or IB.
Grade Calculator
Comprehensive grade calculator for current grades, GPA calculation, and grade predictions. Supports multiple grading systems including US, UK, and international scales.
Final Grade Calculator
Calculate the exact final exam score needed to reach a target course grade. See whether the goal is mathematically reachable from your current grade.
ECTS Calculator
Estimate ECTS credits from total learning workload and a selected hours-per-credit value. See the unrounded result and transparent rounding.
Credit Transfer Calculator
Estimate target-system credits from relative annual study loads and a planning eligibility percentage. Institutional evaluation is always required.
APA Reference Calculator (7th ed.)
Format APA references and in-text citations for books, journal articles, web pages, reports, videos, datasets, and more. Free, fast, and accurate APA 7th generator.
MLA Reference Calculator (9th ed.)
Create MLA 9 Works Cited entries for books, journal and newspaper articles, web pages, and videos with source-specific punctuation.
Date & Time
Date Calculator
Add or subtract whole days, weeks, months or years from a date. Uses calendar-aware month-end and leap-year rules without DST drift.
Age Calculator
Calculate exact age on any date in years, months and days, plus total elapsed days. Handles leap years with clear calendar-based rules.
Working Days Calculator
Count Monday–Friday working days between dates, with inclusive or exclusive-end rules and an optional custom holiday list.
Days Between Dates Calculator
Count calendar days between two dates with explicit exclusive-end or inclusive semantics. Leap-year and DST-safe date-only calculation.
Everyday
Percentage Increase Calculator
Calculate percentage increase or decrease from an original value to a new value. Shows signed numeric change and uses the original magnitude as the base.
Tip Calculator
Calculate a tip, total bill, and per-person share in any currency. Uses transparent cent rounding and supports groups from 1 to 1,000 people.
Discount Calculator
Calculate the final sale price and amount saved from a percentage discount. Currency-neutral results use transparent two-decimal rounding.
Dropshipping Profit Calculator
Calculate dropshipping profit after product, shipping, platform, payment, advertising, refund, and chargeback costs.
Inventory Turnover Calculator
Calculate inventory turnover and days inventory from cost of goods sold and average beginning and ending inventory.
Shipping Cost Calculator
Add freight, packaging, handling, insurance, and surcharges to calculate total shipping cost and cost per unit.
Unit Converter
Convert length, mass, temperature, and explicitly labeled US liquid volume units using documented exact factors and absolute-zero validation.
Business & Marketing
CPC ROI Calculator
Estimate paid campaign ROI, profit, ROAS, ad spend, and conversions from clicks, average CPC, conversion rate, revenue, and variable costs.
Affiliate Commission Calculator
Calculate affiliate commission from eligible sales, reversals, a percentage rate, and a fixed bonus. See net sales and effective payout rate.
CPM Calculator
Calculate CPM and cost per impression from campaign cost and delivered impressions. Supports common currencies and zero-cost earned inventory.
PPC Budget Planner
Estimate a PPC campaign budget from target clicks, average CPC, percentage management fees, and fixed campaign costs.
AI & Digital
Token Cost Calculator
Calculate the cost of one AI token workload from your input and output token counts and your own per-million-token rates.
AI Model Training Cost Calculator
Estimate an AI training run from accelerator count, hours, your hourly rate, storage, and other explicit project costs.
LLM API Cost Calculator
Project a monthly LLM API budget from request volume, average input and output tokens, your rates, and fixed platform costs.
AI Video Generation Cost Calculator
Plan AI video costs from clips, unit or credit pricing, duration, expected retries, upscaling, and post-production costs.
Small Business & SaaS
SaaS Pricing Calculator
Estimate a monthly SaaS price floor that satisfies entered gross-margin and simple CAC-payback targets.
Profit Margin Calculator
Calculate gross profit, gross margin percentage, and markup from revenue and cost of goods sold without confusing margin with markup.
Break-Even Point Calculator
Calculate break-even sales units and revenue from fixed costs, selling price, and variable cost per unit.
Customer Lifetime Value Calculator
Estimate contribution-margin customer lifetime value with constant retention and discount rates, then compare CLV with acquisition cost.
Employee Cost Calculator
Estimate annual, monthly, and hourly employer cost from salary plus user-entered payroll, benefits, and overhead assumptions.
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