Blog
The numbers behind everyday decisions, with the calculator to try alongside each article.
Oct 19, 2026
How much does YouTube pay per 1,000 views?
What creators really earn per 1,000 views from YouTube ads, by niche and audience, what 1 million views pays, how many views $10,000 a month takes, Shorts, and what 500 subscribers unlock.
Oct 19, 2026
How to calculate age from a date of birth
The formula for age in years, months and days, worked through by hand, the cases where it trips people up (the 31st, February 29), the Excel formula and its known flaw, and how Korean age differs.
Oct 19, 2026
How to count days between two dates, and whether to count the first day
The formula for days between dates, when to add 1 for counting both ends, how deadlines like "within 30 days" are counted in the US and the UK, and a table of common cases from hotel stays to whole years.
Oct 6, 2026 · updated Oct 19, 2026
How much protein do you need by age?
Protein needs per kilogram are highest in toddlers, settle at 0.8 g/kg in adults and rise again after 65. A table of the official values by age, what they mean at your weight, and why experts ask older adults to eat more than the RDA.
Oct 6, 2026 · updated Oct 19, 2026
How much protein per day to lose weight for a woman
While losing weight, aim for 1.8 to 2.4 g of protein per kg of body weight, the same rule as for men. A table by weight from 120 to 250 lb, a sample day with 134 g, and when to use your goal weight instead.
Oct 2, 2026 · updated Oct 19, 2026
15 vs 30-year mortgage: the payment, the interest and the middle path
On a $320,000 loan at this week's US averages, a 15-year mortgage costs $615.69 a month more than a 30-year one and saves $283,283 of interest. Why the gap is that large, how fast each loan builds equity, and what happens if you take the 30-year loan and pay it like a 15-year one.
Oct 2, 2026 · updated Oct 19, 2026
Healthy BMI by age: does the number change as you get older?
For adults, the healthy BMI range is 18.5 to 24.9 at every age, for women and men alike. What changes is how to read it. Research on people over 65 finds no extra risk in the overweight range, children are measured on growth charts, and people of Asian background face higher risk at a lower BMI. A worked example at 5 ft 4 in (163 cm).
Oct 2, 2026 · updated Oct 19, 2026
How much is PMI, and when does it end?
Private mortgage insurance costs about $30 to $70 a month per $100,000 borrowed. On a $400,000 home with 10% down that is $108 to $252 a month, and at a typical rate it lasts close to ten years unless you ask to drop it sooner. The cost by down payment, the three dates it can stop, and how extra payments bring them forward.
Sep 27, 2026 · updated Oct 19, 2026
10K vs 14K vs 18K gold: how much is each worth?
10K is 41.7% gold, 14K is 58.5% and 18K is 75%. What that means in dollars per gram, what a buyer will actually pay for each, and why the price gap in a jewelry shop is far bigger than the gold behind it.
Sep 27, 2026 · updated Oct 19, 2026
60 vs 72 vs 84 month car loan: what the longer term really costs
On $40,000, stretching a 60-month loan to 72 months saves $110 a month and costs $1,613 more interest; 84 months costs $3,260 more, and more again when the rate rises with the term. The numbers side by side, how long each term keeps you underwater, and when a long loan still makes sense.
Sep 27, 2026 · updated Oct 19, 2026
Lean FIRE vs Fat FIRE vs Coast FIRE: the numbers behind each
Lean, regular and fat FIRE differ in one number, what you spend, and Coast and Barista FIRE are not spending levels at all. The target for each, how long it takes at different savings rates, and where the labels come from.
Sep 27, 2026 · updated Oct 19, 2026
TDEE vs BMR: which number to eat around
BMR is what you burn lying still; TDEE is what you burn living your day, and it is your maintenance number. Tables for four people at every activity level, what a BMR of 1,500 works out to, and whether eating below BMR is really off limits.
Sep 27, 2026 · updated Oct 19, 2026
Wheel offset vs backspacing: the difference and a conversion chart
Offset is measured from the wheel's centerline in millimeters, backspacing from the inner lip in inches. How to convert one into the other, a chart for common widths, and what a lower offset or a spacer actually moves.
Sep 25, 2026 · updated Oct 19, 2026
Can you avoid PayPal's 3% fee?
Nothing removes the fee from a business payment, and 3% is the rate of only one route. What each route actually costs on $500 and on $5,000, where micropayment pricing wins, and what to invoice so a round number lands.
Sep 22, 2026 · updated Oct 19, 2026
Is 100 grams of protein a day enough?
It depends on two things, and one of them is not up for debate. A table of what 100 g works out to at every body weight, where it runs short, and whether 200 g is too much — with the studies the targets come from.
Sep 20, 2026 · updated Oct 19, 2026
What interest rate should you expect on an RV loan?
US credit unions published starting rates from 5.74% to 10.24% in September 2026 — a spread wide enough to change the payment by hundreds a month. Here is what every lender published, what actually moves your number, and the term trap underneath it all.
Sep 19, 2026 · updated Oct 19, 2026
How long it takes to lose 20 pounds on a 500-calorie deficit
Twenty weeks, if the arithmetic held — and it does not quite. Here is the table for every deficit from 250 to 1,000 kcal, why the last few pounds take longer than the first, and what 500 calories below maintenance actually means on a plate.
Sep 19, 2026 · updated Oct 19, 2026
How much do you need invested to live on dividends?
The capital behind $1,000, $2,000 or $5,000 a month, at yields from 2% to 7%, and what it takes to build it from a normal salary. With the arithmetic laid out and the catch in the high-yield column explained.
Sep 19, 2026 · updated Oct 19, 2026
The 80/10/10 rule: how much raw food to feed your dog
A feeding chart by weight and life stage, what the 80/10/10 split actually contains, and the two things the ratio does not cover — with the FDA's contamination figures and what vets say about balance.
Sep 14, 2026 · updated Oct 19, 2026
How much chocolate is dangerous for a dog?
The danger depends on three things, the dog's weight, the type of chocolate and the amount, and it can be worked out in a minute. Here are the thresholds, the numbers for common chocolates and what to do next.
