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  Temperature in Celsius (°C) Temperature in Fahrenheit (°F) 25 °C = 77 °F 298.15 K · comfortable warm day Formula: °F = (°C × 9/5) + 32  |  °C = (°F − 32) × 5/9 Common temperatures — tap a row to load it Celsius Fahrenheit What it means −40 °C −40 °F The one point where both scales agree 0 °C 32 °F Water freezes 20 °C 68 °F Room temperature 25 °C 77 °F Comfortable warm day 37 °C 98.6 °F Normal body temperature 100 °C 212 °F Water boils The conversion runs entirely in your browser — nothing you type is uploaded or stored. This free Celsius to Fahrenheit converter turns any temperature in degrees Celsius into degrees Fahrenheit instantly — and back again. It is the conversion people look up most often when they travel, cook from a recipe written abroad, read a weather forecast for the United States, or check a fever reading: most of the world uses Celsius, while the United States still reports weather, oven temperatures and body temperature in Fa...

What time should you go to bed? I need to wake up at Calculate my bedtimes I want to sleep now Based on 90-minute sleep cycles and about 15 minutes to fall asleep. A general guide for healthy adults - not medical advice. Sleep cycles vary from person to person (roughly 80-120 minutes).   Most people count backwards from their alarm in whole hours - 8 hours before 7 AM is 11 PM - and then wonder why they still wake up groggy. Sleep does not work in whole hours; it works in cycles of about 90 minutes, moving from light sleep to deep sleep and back again. Waking up in the middle of a deep-sleep phase feels far worse than waking up with slightly less total sleep at the end of a cycle. This free Sleep Calculator works the other way round: pick your wake-up time and it gives you the bedtimes that land on complete 90-minute cycles, allowing about 15 minutes to fall asleep first. A worked example: to wake at 7:00 AM, six full cycles (9 hours of sleep) means going to bed at 9:...

Cost per thousand impressions - all three directions What do you want to work out? CPM from cost and impressions Impressions from budget and CPM Cost from CPM and impressions Total cost / budget ($) Impressions CPM rate ($) Calculate CPM = cost per 1,000 impressions. The same maths works in any currency - the $ sign is just the convention. CPM - cost per mille, Latin for "per thousand" - is the standard price unit of online advertising: what 1,000 ad impressions cost. This free CPM Calculator works in all three directions. Give it a campaign's cost and impressions and it tells you the CPM you actually paid. Give it a budget and a CPM rate and it tells you how many impressions that budget buys. Or give it a CPM and a target number of impressions and it tells you what the campaign will cost. That makes it useful for planning a buy, checking a media quote, or sanity-checking a report from an ad platform. The reference example: spend $500 and receive 100...

Estimate your ovulation day and fertile window First day of your last period Usual cycle length (days) Calculate my dates Important: this is an estimate for general information only. It is not medical advice and it is NOT a method of contraception - never rely on calendar estimates to avoid pregnancy. This free Ovulation Calculator estimates the key dates of your cycle from two inputs: the first day of your last period and your usual cycle length. It works on the standard calendar method used by most cycle trackers - your next period is expected one cycle length after your last one started, and ovulation is estimated at 14 days before that next period, because the second half of the cycle (the luteal phase) is about 14 days for most people. Your fertile window is shown as the five days before ovulation plus the day after, reflecting how long sperm can survive and how long the egg lives. Please use these dates as a rough guide, nothing more. Real cycles vary - sometimes ...

How much water should you drink each day? Your body weight kg lb Activity level Sedentary - desk work, little exercise Moderate - light exercise a few times a week Active - hard training or physical work most days Your climate today Normal Hot - you sweat a lot Calculate my water target A general guide for healthy adults - not medical advice. Needs vary with health, medication, pregnancy and weather; when in doubt, ask a clinician. Forget the one-size-fits-all "eight glasses a day" slogan - how much water you need depends mostly on your size. This free Water Intake Calculator starts with the widely used guide of 35 ml of water per kilogram of body weight, then adjusts it for how active you are (sedentary, moderate or active) and adds 500 ml on hot days when you lose more through sweat. You get your daily target three ways: in millilitres, in litres, and in familiar 250 ml glasses, so you can actually plan your day around it. A worked example: a 70 kg...

Two names, one fun percentage First name Second name Calculate love % For entertainment only - the result comes from the letters in the two names, not from anything real about either person. See the explanation below. This Love Calculator takes two names and gives you a compatibility percentage with a playful verdict - purely for fun. Enter your name and your crush's, your partner's, or any famous couple, and click the button. Unlike random score generators, this one is deterministic: the percentage is calculated from the letters of the two names with a fixed formula, so the same pair of names always produces exactly the same result, in either order. That makes it perfect for settling arguments, sharing a screenshot with friends, or checking whether "you two" score the same today as yesterday (you will). Now the honest part, in big clear letters: this calculator is for entertainment only. The score comes from a maths trick on the spelling of two names. ...

What will my salary be after the raise? Current annual salary Raise (%) Hours worked per week Calculate my raise I know the new salary — what raise is that? Current annual salary New annual salary What percent is that? This free Pay Raise Calculator turns a raise percentage into real money. When your manager says "we're giving you five percent", the natural next question — what does that actually make my salary? — takes annoying mental arithmetic, and most people get the monthly figure wrong. Enter your current annual salary and the raise percentage, and this calculator gives you the raise amount, your new salary, and the before-and-after monthly and hourly figures, so you can judge the offer properly. A second calculator works the other way: if you have been told the new salary figure, it tells you what percentage raise it really is. Putting the monthly number next to the annual one matters, because annual figures flatter. A $3,000 raise on a $60,00...

Salary to hourly rate Pay amount Amount is paid Per hour Per day Per week Per month Per year Hours worked per week Convert salary This free Salary to Hourly Calculator answers a deceptively simple question: what is my salary per hour? Employers quote pay as an annual figure, but hourly thinking is how people actually compare jobs, judge overtime, value their time and check whether a side gig is worth it. Enter your yearly salary and the hours you work in a typical week, and the calculator works backwards to your true hourly rate, with the daily, weekly and monthly equivalents alongside for a complete picture. The hours-per-week setting is the part most rough estimates get wrong. The popular shortcut — divide the salary by 2,080 — quietly assumes a forty-hour week. If you actually work forty-five or fifty hours, your real hourly rate is noticeably lower than the shortcut suggests, and if you work thirty-five, it is higher. Setting your honest hours exposes that ins...

Army body fat — 2023 one-site tape test Sex Male Female Age group 17–20 21–27 28–39 40 and over Units Inches + pounds Centimetres + kg Weight (lb) Abdomen at navel (in) Check my body fat This Army Body Fat Calculator uses the US Army's current one-site tape test — the method introduced in June 2023 under Army Directive 2023-11 and carried in ALARACT 087/2025 — not the retired neck-and-waist formula most older calculators still run. The current test needs only two numbers: your body weight and your abdominal circumference measured at the navel. The calculator applies the official equation for your sex, rounds to the nearest whole percent the way the Army does, and checks the result against the AR 600-9 maximum for your age group, with a clear pass or over-standard verdict. Measure the way the Army does: abdomen at the level of the navel (belly button), tape horizontal on bare skin, arms at your sides, at the end of a normal breath out — do not suck in. Officially...

Your calorie deficit targets Sex Male Female Age (years) Weight (kg) Height (cm) Activity level Sedentary (little or no exercise) Light (exercise 1–3 days/week) Moderate (exercise 3–5 days/week) Active (exercise 6–7 days/week) Very active (hard daily training or physical job) Calculate my deficit This free Calorie Deficit Calculator starts from the only number that matters for weight loss — your maintenance calories — and turns it into a daily eating target. It first estimates your BMR and TDEE with the Mifflin-St Jeor equation, the formula studies generally find most accurate, then subtracts a deficit at three sensible paces: a mild 250-calorie deficit for about a quarter kilo a week, the standard 500-calorie deficit for about half a kilo a week, and a larger 750-calorie deficit for those with more to lose. Your deficit targets are highlighted first, because "how much should I eat to lose weight?" is the question this page exists to answer. A calorie...

Remove GST from a price Price including GST (₹) GST rate (%) Common GST slabs: 5%, 12%, 18%, 28%. The rate is preset to 18%, the standard slab. Remove GST Add GST to a price Price before GST (₹) GST rate (%) Add GST This free Reverse GST Calculator works backwards: you enter a price that already includes GST, and it tells you the original price before tax and exactly how much of what you paid was GST. That backwards question — "remove GST from this price" — is what shopkeepers, freelancers, accountants and online sellers actually face every day, when an MRP, a bill total or a marketplace payout is GST-inclusive and the books need the taxable value and the tax amount as separate figures. The important thing is the method, because the obvious method is wrong. You cannot find the pre-GST price by subtracting 18% from the total: GST was charged on the smaller base price, so 18% of the bigger inclusive price is too much. The correct calculation divides the in...

How old is your dog in human years? Dog's age - years Plus months Adult size of your dog Small - up to 20 lb (9 kg), e.g. Chihuahua, Toy Poodle Medium - 21 to 50 lb (10-23 kg), e.g. Beagle, Border Collie Large - 51 to 90 lb (24-41 kg), e.g. Labrador, German Shepherd Giant - over 90 lb (41 kg), e.g. Great Dane, Mastiff Calculate human years Both methods below are estimates. Dogs age at very different speeds depending on breed, size, health and lifestyle - your vet knows your individual dog. This free Dog Age Calculator converts your dog's age into human years using the modern, size-based method vets actually use - not the old "multiply by seven" myth. Enter your dog's age in years and months, pick its adult size, and you get a human-years estimate from the standard veterinary chart: the first year of a dog's life counts for about 15 human years, the second year adds about 9 more, and every year after that adds roughly 5 for small and medium...