Krill Kits Blog.
Deep dives on the math behind every Krill Kits tool. Percentage math, mortgage amortization, macros, fasting protocols, word-game dictionaries — one topic at a time, no preamble, no cookies..
Health.
Bodies, food, time.- 16:8 vs 18:6 vs OMAD — picking a fasting protocolANCHOR5 MIN→
Tradeoffs between sustainability, metabolic impact, and real-world adherence.
- BMI vs body fat % — which one actually mattersANCHOR5 MIN→
BMI is a filter; body fat % is the signal. When each is the right tool.
- How to calculate macros for weight lossANCHOR5 MIN→
Protein anchors; fat and carbs fill the gap. A walk-through from TDEE to plate.
- How to scale a recipe without ruining itANCHOR5 MIN→
Spices, leaveners, pan sizes — the non-linear parts of doubling a recipe.
- What Is TDEE — and Why It Matters More Than BMIANCHOR5 MIN→
Your TDEE is the number of calories you burn in a normal day — and a far better guide to losing, maintaining, or gaining weight than BMI.
- Why cups-to-grams matters in bakingANCHOR4 MIN→
A cup of flour isn’t a weight. It’s a range — and that range breaks recipes.
- Baking by weight vs volume — why pros pick weight5 MIN→
Consistency, scaling, and the reason Europeans stare at American recipes.
- Chronological vs biological age — what the difference actually means5 MIN→
One is the calendar, the other is biology. Here’s how to tell them apart.
- How many calories should a 200 lb man eat per day?3 MIN→
A real answer with assumptions spelled out — and why the number changes as you do.
- How to convert any recipe from cups to grams4 MIN→
A density-first process that works without a conversion table in hand.
- How to scale spices when doubling a recipe3 MIN→
A practical rule that beats “just double it” and still tastes right.
- Intermittent fasting for women — what’s different5 MIN→
Hormonal considerations the default protocols don’t address.
- Leap-year birthdays — how to count them consistently3 MIN→
Feb 29 birthdays and the math of "when do I turn one?"
- Macros for muscle gain vs fat loss5 MIN→
Same framework, different numbers. What changes and what stays the same.
- TDEE vs BMR — which should you track?4 MIN→
BMR is what you burn at rest. TDEE is what you actually burn in a day. Here’s which number to use when.
- The 40/30/30 macro split, explained4 MIN→
Where the ratio came from, when it works, and when it’s just a round number.
- What actually breaks a fast4 MIN→
Coffee, tea, bone broth, zero-cal drinks — what the metabolic evidence says.
- When age calculations get weird4 MIN→
Time zones, February 29, months with fewer days — the gotchas that trip most libraries.
- Which ingredients don’t scale linearly4 MIN→
Salt, yeast, vanilla, pepper — the usual suspects, and what to do with them.
- Why BMI misclassifies muscular bodies4 MIN→
The formula doesn’t know what you’re made of — and it shows.
- Why your TDEE changes as you lose weight5 MIN→
Every plateau is TDEE adapting. Here’s the math and what to do about it.
Numbers.
Money, math, decisions.- How mortgage amortization actually worksANCHOR5 MIN→
Why the first payments barely touch principal, and the curve that flips around year 15.
- Rent vs buy — the real math nobody shows youANCHOR6 MIN→
Down payment, opportunity cost, maintenance, and the 5-year horizon.
- What compound interest really is — and why it winsANCHOR5 MIN→
Interest on interest, the quiet superpower of time.
- 15 vs 30 year mortgage — the math and the tradeoffs5 MIN→
Total interest, monthly cash flow, and the case for either.
- Auto loan APR explained — dealer vs bank vs credit union4 MIN→
Where the best rates actually are, and what the dealer’s “offer” includes.
- Cap rate in plain English — what a “good” number is4 MIN→
Typical ranges, what a high number signals, and when it’s hiding something.
- Cap rate vs cash-on-cash return — leverage changes everything5 MIN→
Unlevered vs levered yield, and when to quote which.
- Discount vs markup — why 50% off is not 50% on4 MIN→
The asymmetry that makes clothing pricing feel like a trap.
- Extra principal payments — the highest-return “investment” you have5 MIN→
Add $200/mo and watch the interest column collapse.
- Fuel cost per mile — the number your car’s computer hides3 MIN→
MPG × price → cents per mile. Why fleet managers track it.
- Gross vs net pay — where the difference goes4 MIN→
Federal, state, FICA, benefits. Why 70% of gross is a reasonable default.
- Hourly vs salary — what the math really trades4 MIN→
Overtime, PTO, benefits, and the “$X/hour is really $Y” rule.
- How much to tip — a no-drama guide4 MIN→
US rules of thumb, international norms, and when the “range” actually matters.
- How to calculate percentage change3 MIN→
Old to new, gains and losses — the formula, the mistakes, and a cleaner way to explain it.
- How to read a discount sign without getting fooled3 MIN→
“Up to”, anchor prices, and the MSRP trick.
- Keystone pricing — why retail defaults to 100% markup4 MIN→
The industry shorthand that built American retail, and where it breaks.
- Margin vs markup — the mistake that wrecks pricing4 MIN→
Same profit, two denominators, very different percents.
- Moving for a raise? Adjust for cost of living first5 MIN→
A 25% raise into a 50%-more-expensive city is a pay cut.
- MPG vs L/100km — why one gets it right and one doesn’t4 MIN→
One is a rate of travel. The other is a rate of consumption. Guess which wins.
- Percentage vs percentage points — the difference4 MIN→
Every news article misuses this. Here’s the one-sentence rule.
- Pre-tax vs post-tax tip — what actually matters3 MIN→
One is traditional. One is practical. Both are fine. Here’s the gap.
- Reverse sales tax — find the pre-tax price from a receipt3 MIN→
The division most people do wrong. Here’s the right formula.
- ROI vs CAGR — why annualized returns tell the truth4 MIN→
200% over 10 years is 11.6% a year. The honest number.
- Sales tax vs VAT — two very different systems4 MIN→
Collection points, rate structures, and why Europeans say “all in”.
- Simple vs compound returns — the 3x example4 MIN→
Small differences compound dramatically. An illustration in dollars.
- Splitting the bill fairly when people ordered differently5 MIN→
Even-split, item-split, and weighted-split — pick the right one for the table.
- Starting early beats investing more later5 MIN→
A 25-year-old with $100/mo crushes a 35-year-old with $200/mo. Here’s why.
- The 5-year rule — why short stays usually lose to renting4 MIN→
Transaction costs crush buyers with short horizons. The math, with examples.
- The hidden costs of homeownership most buyers miss5 MIN→
Taxes, insurance, HOA, maintenance, opportunity cost. The “plus” stack.
- The real cost of owning a car — payment is only part of it5 MIN→
Fuel, insurance, maintenance, depreciation. The line items the dealer doesn’t list.
- The rental expenses new landlords always forget5 MIN→
Vacancy, maintenance, management, capex reserves — the line items that kill pro-formas.
- The Rule of 72 — how fast your money doubles3 MIN→
One division, answers to every “how long until” question.
- Three percentage mistakes that cost you money4 MIN→
Tips, discounts, and tax. The math that hurts when you get it wrong.
- Three ways to price from cost — and when to use each5 MIN→
Target margin, target markup, target dollar. Pick one on purpose.
- US sales tax in plain English — state, county, city5 MIN→
Why a zip code change can swing the tax by 5 points.
- What a “healthy” margin looks like by industry4 MIN→
Benchmarks for SaaS, retail, restaurants, and services.
- What counts as a “good” return — benchmarks by asset class5 MIN→
Stocks, bonds, real estate, cash. Long-run numbers and what they imply.
- When stacking discounts actually works (and when it doesn’t)4 MIN→
The order matters. So does the fine print. The quick rule for retail.
- Why 72- and 84-month car loans are a trap5 MIN→
The payment goes down. The total cost goes up. And you’ll probably go underwater.
- Why real-world MPG is always worse than the sticker4 MIN→
Test conditions, your conditions, and the 10–15% gap.
Words.
Letters and meaning.- ENABLE, TWL, SOWPODS — which word list to trustANCHOR5 MIN→
Overlap, legal status, and what tournaments actually use.
- A short history of anagrams — from Greek puzzles to Twitter5 MIN→
Word games existed before writing had rules.
- Best Wordle starter words — the math of an opener4 MIN→
Letter frequency, vowel coverage, and why CRANE / SLATE / SOARE keep showing up.
- Famous anagrams in literature and cryptography4 MIN→
Galileo hid results in them. Nabokov built characters with them.
- Scrabble strategy — when to dump a Q and other rack management5 MIN→
Vowel-consonant balance, bingo bonuses, and why the 2-letter words are gold.
- Unscrambler vs anagram solver — different problems3 MIN→
Same input, different contracts. When to reach for which.
- Why Scrabble letters score what they do4 MIN→
The 1948 frequency analysis behind the tiles in the bag.
Units.
Conversions that matter.- Metric vs imperial — why the US is still the odd one outANCHOR5 MIN→
A brief history and the practical case for SI everywhere else.
- GB vs GiB — settled. Why your "1 TB" drive shows 931 GB5 MIN→
Decimal SI vs binary IEC prefixes, why hard drives "lose" capacity, and what KiB really is.
- The temperature conversion formula you actually remember3 MIN→
One formula, two offsets, and a mnemonic that sticks.
- US vs imperial gallons — a 20% difference hiding in plain sight4 MIN→
3.785L vs 4.546L. Why British MPG numbers look so good.
Text.
Shape, count, format.- Average reading speed — how long will your post take?3 MIN→
225 WPM is the sober median. Skimmers run faster; subject-matter slows us down.
- camelCase vs snake_case vs kebab-case — a short history4 MIN→
How we arrived at three mutually exclusive styles for the same idea.
- Character limits by platform — cheat sheet3 MIN→
X, LinkedIn, Bluesky, email subject, meta tags. All the numbers in one place.
- Meta description length — the Google truncation rule3 MIN→
Why 155–160 chars is the real ceiling in the SERP.
- Naming conventions by language — the dev cheat sheet4 MIN→
What Python, Go, Rust, JS, and SQL each expect. And why they diverge.
- Title case rules — which small words stay lowercase3 MIN→
AP, Chicago, and “just pick one and be consistent”.
Generators.
How things get made.- How QR codes actually work under the hoodANCHOR4 MIN→
A 2D barcode, Reed-Solomon error correction, and the three position markers.
- Password entropy explained — what the bits meanANCHOR4 MIN→
A 60-bit password and a 128-bit password aren’t twice as strong. They’re worlds apart.
- Are password managers worth it? Yes. Here’s why.5 MIN→
One breach shouldn’t take down your life. A password manager is how you prevent it.
- Epoch time in plain English3 MIN→
Seconds since 1970-01-01 UTC. Why, how to read one at a glance, and the 2038 problem.
- Lorem ipsum alternatives for better design reviews3 MIN→
Realistic copy surfaces problems lorem hides.
- Passphrases vs random passwords — which is stronger?4 MIN→
Four words from a dictionary of 7,776 beats most “clever” patterns.
- Pomodoro vs flow — picking the focus method that fits the work5 MIN→
25/5 cycles, deep-work blocks, time boxing — when each helps and when each hurts.
- QR error correction levels — when to use each4 MIN→
L, M, Q, H. Print size and logo-covered codes set the floor.
- The Wi-Fi QR code format nobody told you about3 MIN→
WIFI:T:WPA;S:SSID;P:password;; — the schema every phone supports.
- Time zones that bite — DST and midnight edge cases5 MIN→
The 25-hour day and the 23-hour day nobody budgets for.
- Where lorem ipsum really comes from — a Cicero excerpt4 MIN→
Not gibberish — scrambled Latin from "On the Ends of Good and Evil".
- Why countdown timers convert — the psychology of deadlines4 MIN→
Loss aversion, temporal discounting, and honest urgency vs fake scarcity.
- Why designers use placeholder text — and when not to4 MIN→
Focus on layout, then kill the placeholder before user testing.