Calculators
Free, instant calculators for health, finance and everyday math. No signup. Works in your browser.
78 calculators
Health & fitness
BMI Calculator
Calculate your Body Mass Index and see where you fall on the WHO classification scale. No sign-up, no paywall.
Try it →Body Fat Percentage Calculator
Estimate your body fat using the U.S. Navy method or a BMI-based fallback. Free, fast, no sign-up.
Try it →Calorie Deficit Calculator
Find the daily calorie target that matches your weight loss goal, with safe-floor guardrails. Free and instant.
Try it →Daily Water Intake Calculator
Personalized hydration goal based on body weight, activity, climate, and life stage. Free, no sign-up.
Try it →1 Rep Max (1RM) Calculator
Estimate your one-rep max from a sub-max set, with a full %1RM training table. Free, no login.
Try it →Ideal Weight Calculator
Side-by-side estimates from Devine, Robinson, Miller and Hamwi formulas, plus a healthy BMI range. Free.
Try it →Heart Rate Zones Calculator
Calculate your max HR (Tanaka, classic, or Karvonen) and 5 personalized training zones in BPM. Free.
Try it →FFMI Calculator (Fat-Free Mass Index)
Estimate your lean muscle index and see where you stand on the natural-lifter scale.
Try it →Race Time Predictor (Riegel formula)
Use a recent race time to predict your 5K, 10K, half-marathon and marathon — based on the classic Riegel power law.
Try it →Protein Intake Calculator
Find your daily protein target based on goal and bodyweight, with a per-meal breakdown.
Try it →Intermittent Fasting Schedule Calculator
Pick a protocol (16:8, 18:6, OMAD…) and see exactly when to eat and when to fast based on your last meal.
Try it →Sweat Rate Calculator (Athlete Hydration)
Weigh in before and after training to measure your real fluid loss per hour and plan a hydration strategy.
Try it →Wilks, DOTS & IPF GL Calculator
Convert powerlifting totals into Wilks, DOTS and IPF GL coefficient scores so lifters of any weight can be compared.
Try it →Pregnancy Weight Gain Calculator (IOM)
Track recommended pregnancy weight gain by week, based on your pre-pregnancy BMI and the official IOM 2009 ranges.
Try it →Waist-to-Height & Waist-to-Hip Ratio Calculator
Two simple measurements that predict cardiometabolic risk better than BMI alone — get your WHtR, WHR and body shape.
Try it →Period & Ovulation Predictor
Project the next 12 cycles, see ovulation and fertile window dates, and plan ahead — math only, no account.
Try it →TDEE Calculator
Estimate your Total Daily Energy Expenditure — the calories you actually burn each day. Includes cut, maintain and bulk targets.
Try it →Macro Calculator
Split your daily calories into protein, carbs and fat — instantly. Pick your goal and get exact grams to hit each day.
Try it →Pregnancy Due Date Calculator
Find your estimated due date, current gestational age and trimester from your last menstrual period.
Try it →Ovulation Calculator
Estimate your most fertile days based on your last period and cycle length.
Try it →Sleep Cycle Calculator
Find the best time to go to bed — or to wake up — based on 90-minute sleep cycles, so you wake feeling refreshed instead of groggy.
Try it →Running Pace Calculator
Pace, time, distance, and race-time predictions — switch the mode and we'll solve for whatever's missing.
Try it →Money & finance
Loan Calculator
Estimate your monthly payment, total cost, and total interest on any fixed-rate loan.
Try it →Compound Interest Calculator
See how your money grows when interest earns interest. Add monthly contributions to project your wealth over time.
Try it →Mortgage Calculator
Estimate your monthly mortgage payment including principal, interest, taxes, insurance, and HOA. See how rate and term change the total cost of your home loan.
Try it →Tip Calculator
Work out the tip, the total bill, and what each person owes — split a check fairly in seconds.
Try it →Discount Calculator
Find the sale price, the original price, and exactly how much you save — including stacked Black Friday-style "extra X% at checkout" deals.
Try it →Hourly to Salary Calculator
Convert an hourly wage to annual salary — or the other way around — with paid-vacation, weekly, monthly, and daily breakdowns.
Try it →Auto Loan Calculator
Estimate your monthly car payment, total interest, and payoff date — including down payment, trade-in, and sales tax.
Try it →Credit Card Payoff Calculator
See how long it takes to pay off a credit card — or what monthly payment you need to be debt-free by a target date.
Try it →Net Worth Calculator
Add up your assets and liabilities to see your real net worth — privately, in your browser.
Try it →Dollar-Cost Averaging Calculator
Project the future value of regular contributions — see how a steady investing habit compounds over time.
Try it →Profit Margin Calculator
Calculate gross margin, markup, and the price you'd need to charge to hit a target margin.
Try it →Brazil CLT Net Salary Calculator (2026)
Brazil-specific tool. Compute the take-home pay for a CLT employee under the 2026 income-tax reform (full exemption up to R$5,000 gross).
Try it →Brazil CLT Severance Calculator (2026)
Brazil-specific tool. Compute exactly what's owed at the end of a CLT employment relationship.
Try it →Brazil 13th-Salary Calculator (2026)
Brazil-specific bonus. Compute the November and December installments under the 2026 IR reform.
Try it →Brazil INSS Calculator (2026)
Brazil-specific. Compute the social-security contribution for a CLT employee under the progressive 2026 bands.
Try it →Brazil Overtime Calculator (2026)
Brazil-specific. Compute 50% (weekday) and 100% (Sunday/holiday) overtime, plus night-shift bonus and DSR reflex.
Try it →Spain Net Salary Calculator (IRPF 2026)
Estimate your monthly take-home pay after Social Security and IRPF, including autonomous community adjustments.
Try it →US Paycheck Calculator 2026
Estimate your federal, FICA and state tax withholdings to see your real take-home pay per pay period.
Try it →Crypto Profit Calculator
Compute your gain or loss in seconds: buy price, sell price, quantity and exchange fees.
Try it →Mortgage Refinance Break-Even Calculator
Should you refinance? See how many months it takes for the new payment to repay the closing costs.
Try it →How Much House Can I Afford?
Get the maximum home price your income can support using the 28/36 DTI rule with property tax, insurance and HOA.
Try it →Mortgage Amortization Schedule Calculator
See every payment of your loan: principal, interest and remaining balance for all 360 months of a 30-year mortgage.
Try it →50/30/20 Budget Calculator
Split your monthly take-home into needs, wants and savings using Senator Warren’s rule. Adjust the percentages to fit your life.
Try it →Inflation Calculator (US, BR, EU)
Convert any amount of money between any two years using official CPI data — see what $100 in 1980 is worth today.
Try it →Fuel Trip Cost Calculator
Compute how much fuel a trip burns in dollars (or euros, reais), supporting MPG, km/L and L/100km.
Try it →Everyday math
Age Calculator
Calculate your exact age in years, months, and days from any birth date — plus your total months, weeks, days, hours, and minutes alive, and the days until your next birthday.
Try it →Percentage Calculator
Three percentage calculations in one tool: what is X% of Y, X is what percent of Y, and the percent change between two numbers. Instant results, no signup.
Try it →Date Difference Calculator
Find the exact span between any two dates — in years, months, days, weeks, hours, and minutes.
Try it →Rule of Three Calculator
Solve any direct or inverse proportion in seconds — fill in three values and we find the fourth.
Try it →Pet Age Calculator
How old is your dog or cat in human years? Get the modern, size-aware estimate — not the outdated 7× rule.
Try it →Cat Age Calculator
Convert your cat's age into human years using the modern feline aging curve — and see exactly which life stage they're in.
Try it →Dog Age Calculator
How old is your dog in human years? The modern, size-aware formula — small dogs and giant breeds age very differently after year two.
Try it →How Many Days Have I Been Alive?
Your life in days, hours, minutes and seconds — counting up live. Plus heartbeats, breaths, full moons seen, and the next 1,000-day milestone.
Try it →Reading Time Calculator
How long will it take to read this? Paste any text or enter a page count — we'll show minutes, hours, and word count at slow, average or fast WPM.
Try it →Coffee Brew Ratio Calculator
Pick a brew method, set your beans or water, and get the right ratio plus a grind and time guide.
Try it →Caffeine Calculator — When Can I Sleep?
Add what you drank today and see how much caffeine is still in your system — and the time it drops below the sleep-safe threshold.
Try it →Wedding Anniversary Calculator
How long you've been married, when your next anniversary lands, and the traditional gift theme for every year up to 50.
Try it →Final Grade Calculator
What score do you need on the final exam to land your target grade — or what will your course grade be if you ace (or bomb) the final?
Try it →Cups to Grams Converter
Convert cooking measurements between cups, grams, ounces and milliliters using accurate ingredient densities.
Try it →Fuel Consumption Calculator
Work out your real-world MPG, km/L or L/100km, or convert between any of those units instantly.
Try it →Time Card Calculator
Add up daily and weekly work hours, including overnight shifts and breaks. Optional pay total.
Try it →Mulch, Soil & Gravel Calculator
Work out exactly how much mulch, soil or gravel your beds need in cubic yards, cubic meters and bags.
Try it →Concrete Calculator
Estimate concrete volume and bag count for slabs, footings and columns in yards or cubic meters.
Try it →BTU Air Conditioner Sizer
Find the right AC size for your room based on area, ceiling, sun exposure and climate.
Try it →Fraction Calculator
Add, subtract, multiply or divide two fractions and get the simplified result with worked steps.
Try it →Standard Deviation Calculator
Paste numbers and instantly get mean, median, mode, range, sample SD, population SD and variance.
Try it →Days Until Calculator
A live countdown to any future date — Christmas, New Year, your wedding, a holiday, anything.
Try it →Recipe Scaler
Scale any recipe up or down in seconds. Type or paste ingredients and pick a new serving size.
Try it →Oven Temperature Converter
Switch between Fahrenheit, Celsius, fan-assisted Celsius, and British Gas Mark in one tap.
Try it →Days Sober Counter
Track your time, your milestones, and the savings — one day at a time.
Try it →Cost of Smoking Calculator
See what cigarettes cost over a lifetime — and what the same money becomes if you invest it instead.
Try it →Shoe Size Converter
Convert between US, UK, EU, Japanese, and centimetre sizes for men's and women's shoes.
Try it →Chinese Zodiac Sign Calculator
Find your animal, element, and yin/yang from your birth date — using the lunar calendar, not January 1.
Try it →Roast Cooking Time Calculator
Cooking-time and resting-time estimates for turkey, chicken, pork, brisket, ham, and prime rib.
Try it →Jet Lag Recovery Calculator
Estimate recovery days and get a 3-day light, sleep, and meal plan based on your direction of travel.
Try it →Half-Your-Age-Plus-Seven Calculator
The classic social rule for an acceptable dating age range — calculated, with a wink.
Try it →