Quick answers for everyday questions
✅ Free · 📱 Works on phones · 🚫 No sign-up
Press the buttons — just like a pocket calculator.
💡 Tip: you can type on your keyboard too. Press Enter for equals.
Each color is a time zone. The badges show the time there right now!
🗺️ States are colored by their main time zone — a few states are split down the middle. Fun fact: Arizona skips daylight saving time, so in summer its clocks match California's!
Pick a city and see its clock right now.
Your clock: --:-- ·
See what time it will be for them.
Slide the sliders — the answer updates by itself!
Every month, for the whole loan.
🎉 Your down payment covers the whole price — no loan needed!
💡 This is just the loan part. Real house payments also include things like taxes and insurance.
Start with a day and a time, then jump forward or back.
Great for figuring out shifts, trips, or sleep!
Slide to pick a time — you can even adjust it while it's running!
🔗 Shortcut that starts this timer by itself:
cherrycalc.com/?timer=5
Save it as a bookmark or desktop shortcut!
How long does it take? Press start and find out.
Focus for a while, then take a little break. After 4 focus rounds you earn a long break!
Type the bill, pick a tip, split it — the answer updates by itself!
Tip, grand total, and each person's share.
💡 Tip is figured on the bill before tax. When splitting, rounding may make the shares add up to a penny more or less than the total.
Like "what is 20% of 80?" — handy for discounts and tips.
Like "15 is what percent of 60?"
Went up or went down — and by what percent?
💡 Percent change compares the new number to the old one. Going from 100 to 150 is a 50% increase; going back from 150 to 100 is only a 33% decrease.
Joining partway through the month? Pay only for the days you'll actually use.
💡 Most subscriptions renew on the 1st. If yours renews on another day, change this.
Just for the rest of this billing period.
💡 We charge from your start date up to the next renewal. The math uses the real length of the billing month, so it's exact.
They already paid. They're stopping partway through. This works out how much goes back.
💡 “Up to” is the next renewal day — the first day they were not paid up for. Pick 1 month or 1 year and it fills itself in.
For the days they paid for but won't get to use.
💡 The day they stop counts as used, so the refund starts the day after. Same daily rate as the prorate side — pay for a day, use a day.
Inches, feet, miles, meters — change one into another.
Ounces, pounds, grams, kilograms — great for recipes and packages.
Fahrenheit, Celsius and Kelvin — for weather, ovens and science class.
💡 Temperature is the odd one out: you can't just multiply. Water freezes at 32°F, 0°C and 273.15 K — all the same coldness, three different number lines.
Pick the units you know best, then type your numbers.
💡 Switching units changes your numbers over for you — nothing gets lost.
One number that compares your weight to your height.
💡 BMI is just a rough guide, not medical advice. It only knows your height and weight — not your muscle, bones or age — so a very athletic person can score "overweight" and still be perfectly healthy. Ask a doctor about your own body. (Grown-up numbers: healthy is 18.5–24.9, over is 25–29.9, obese is 30+. Kids and teens use different charts.)
Pick the day you were born and see exactly how old you are.
💡 Change the second box to see how old you were — or will be — on any other day.
Down to the exact day.
💡 You were born on February 29 — that day only comes around every 4 years! In the years that skip it, we count your birthday as March 1.
Money you already have, plus a bit more each month.
💡 Adding interest every month grows a little faster, because the interest starts earning interest too.
Your money at the end, and where it came from.
💡 This is only an estimate. Real savings accounts change their interest rate whenever they like, some charge fees, and taxes can take a slice of what you earn — so treat this as a friendly guess, not a promise.
Type the price and the discount — the answer shows up by itself!
💡 Stores take the discount off first, then add the tax to the smaller price — so a sale saves you a little tax money too.
The final price, and how much you're saving.
💡 Some stores round the sale price to a friendlier number, and tax rules change from place to place — so the register might be a few cents off from this.
Type how far you're going — the gas cost shows up by itself!
💡 Not sure how far your car goes on a gallon? It's usually printed on the window sticker, or in the little book in the glovebox.
The whole trip, and everyone's share.
💡 This is a friendly guess. Hills, traffic, roof racks and a heavy load all drink extra gas, and the price on the sign changes from town to town — so bring a few dollars more than this.
Type what you got and what it was out of — your grade shows up by itself.
💡 Leave a row empty and it's skipped — so it's fine to have a few spares waiting.
Every letter, and how close the next one is.
💡 This counts every point the same, which is how most classes work. If your teacher says tests are worth more than homework, ask them how they weigh it — the real grade can be a little different.
Pick the letter you got and how many credits the class is worth.
💡 Not sure about credits? Most single-period classes are 1 credit. Half-year classes are often 0.5.
On the usual 4.0 scale.
💡 A class worth more credits pulls your GPA harder than a small one — that's why this multiplies each grade by its credits before averaging. Some schools give extra points for honors or AP classes; this one doesn't.
Type your numbers — everything else works itself out!
💡 Tick this if the hours past 40 are paid at time-and-a-half. Under 40 hours a week it changes nothing.
Before anything is taken out of it.
If about 22% is held out of every check:
⚠️ This take-home number is a rough guess, not tax advice. What actually lands in your account depends on your state, your W-4, health insurance, retirement and more — a real pay stub is the only way to know.
💡 "A month" is the year cut into 12 equal pieces. If you're paid every two weeks you really get 26 checks a year, so two months each year have three paydays in them — a nice surprise.
Four numbers, and it tells you if you're really making money.
💡 Only count what goes up when you sell one more — parts, supplies, the hours you pay someone, the card fee. Rent belongs in the bills box below.
Everything updates as you type.
⚠️ This is what's left before taxes — put some of it aside. And if you pay yourself out of the business, add your own pay to the "bills you pay anyway" box so you can see what's really left over.