How to Recover from Jet Lag: A Time-Zone Reset Plan
Jet lag eases at roughly one day per time zone crossed. Learn why eastward travel is harder, and follow a light, sleep and meal plan to reset your body clock faster.
Marco Bianchi · 4 min read
Guides & tutorials
Practical guides, how-tos and comparisons to get the most out of our free online tools.
May 15, 2026
How Many Amps Does an Appliance Draw?
Divide the appliance wattage by the supply voltage to get the current in amps — the number that decides breaker size, wire, and what can share a circuit.
Marco Bianchi · 5 min read
May 14, 2026
How Instagram Fonts Actually Work (They Are Not Fonts)
Nothing is styled. Each letter is swapped for a different Unicode character that happens to look bold or cursive — which is why a screen reader reads the result as gibberish and some devices show empty boxes.
Daniel Okonkwo · 7 min read
Pace to Speed Conversion: Min/Mile, MPH and the Formulas
How to convert between running pace in minutes per mile and speed in miles per hour, with the exact formulas.
Aisha Karim · 4 min read
What Is the Maximum Debt-to-Income Ratio for a Mortgage?
Understand the 33% to 43% debt-to-income limits lenders use, how they calculate the ratio, and what to do if yours is too high.
Camille Laurent · 4 min read
May 13, 2026
Impermanent Loss Explained: What Providing Liquidity Really Costs
Impermanent loss is not a fee and it is not temporary: it is the gap between your liquidity position and simply having held the two tokens. Here is the formula, a table of price change against loss, and the fee income you would need to come out ahead.
Camille Laurent · 6 min read
How Etsy Fees Work: The 6.5 Percent Is About a Third of the Bill
The famous transaction fee is one of five layers. On a $40 item with $6 shipping, Etsy's order fees come to $4.62 — and $11.52 if the sale came through Offsite Ads.
Camille Laurent · 8 min read
May 12, 2026
How to Calculate Molar Mass, Including Parentheses and Hydrates
Multiply each atomic weight by its subscript and add. The only three places the arithmetic goes wrong are a subscript after a closing bracket, the hydrate dot, and a capital letter typed as a lowercase one.
Lena Hoffmann · 6 min read
How Much Sodium Per Day Is Safe?
The 2,300 mg FDA limit, the 1,500 mg ideal from the AHA, and why most sodium is hidden in packaged food — plus how to read labels and cut back.
Sofia Nunes · 3 min read
May 11, 2026
What a Deposit Ladder Actually Costs: $141.92 Over Five Years
Split $50,000 into five rungs instead of one five-year deposit and you end year five with $61,573.20 instead of $61,715.12. The whole liquidity option costs $141.92, once, during the ramp — and it is worth $1,049.24 if rates rise a point.
Camille Laurent · 12 min read
How to Estimate Flight Time: Distance, Cruise Speed and Overhead
Estimate a flight's duration by dividing the great-circle distance by cruise speed, then adding taxi, climb and descent overhead. A simple, reliable method.
Marco Bianchi · 4 min read
How Many Servings in a Cake? A Size Guide
How many slices you get from a cake depends on its size, shape and how big you cut the pieces. Learn the servings for round and square pans, and party versus dessert slices.
Marco Bianchi · 4 min read