calculators tools

Scale ingredient amounts from original to desired servings.

Swap common baking ingredients with measured alternatives.

Roast time, oven temperature, and safe internal temp by meat type.

Food calories vs minutes of exercise and walking distance.

UK units, NHS weekly guide, calories, and rough metabolism time.

Seven questions with a 0–21 total and severity band - not a diagnosis.

16 items across exhaustion, cynicism, inefficacy, and overload (1–5 each).

Sleep efficiency, 0–100 quality score, rough weekly debt, and tips.

Ten-item perceived stress scale–style scoring with reverse items.

Weekly/yearly hours, sleep, productivity, and eye-strain heuristics.

Rough annual CO₂e from home, travel, diet, and shopping - planning only.

Rough panel count, kWh, savings, payback, and grid CO₂ avoided.

Fuel-only TCO sketch, break-even year, and rough CO₂ difference.

Daily and yearly litres from habits plus diet band vs a benchmark.

Money lost, rough kg wasted, and CO₂e from thrown-away food.

Wall area (m²), litres of paint, tin mix, and cost from price per litre.

Area from one or two rectangles; material, tier, underlay, and fitting.

Material + labour ballpark by length, height, material, and gates.

Low/mid/high roof replace band, $/m², and material lifespan note.

Material + labour sketch, $/ft², maintenance band, US state labour factor.

Weekly through 10-year cost of a repeating spend plus fun comparisons.

Plan work, short, and long breaks - same rhythm as Pomodoro (no live timer here).

Convert hourly/daily/weekly/monthly/annual with holidays and rough after-tax.

One-shot meeting cost from headcount, salaries, and duration + recurring scenarios.

Heuristic life expectancy, years left, and top lifestyle factors - wellness only.

Estimated value today, depreciation, and simple year-0–10 curve text.

Cost per mile/km, monthly and annual total from fuel, insurance, service, tax.

Convert US/UK MPG, L/100km, km/L; optional tank range and cost/100.

Illustrative VED bands for petrol/diesel/EV - simplified 2024/25 style.

Overall diameter, circumference, speedo error vs new tyre size.

Cooper 12-min, 1.5-mile, or HR method → VO₂ max and zones.

Epley, Brzycki, Lombardi from weight × reps; %1RM table.

Pace ↔ time for 1K–marathon presets or custom distance.

Race time from pace/100m; time per length in 25m or 50m pool.

W/kg from FTP and weight; category band, 20-min power, Coggan-style zones.

Total sleep, naps, wake windows, sample timetable by age (weeks).

Mid-parental adult height estimate with optional growth percentile note.

DOB + country → school year label, Sept age, oldest/youngest hint.

Weekly/monthly/yearly from type, hours, and broad region band.

Up to four earners vs expenses, savings rate, 50/30/20 check.

Compare total cash cost of leasing vs financing a purchase over the same term.

Compute MPG or L/100 km from distance and fuel used.

Estimate monthly or multi-month parking spend from daily rate and usage.

Estimate gross pay from hourly rate, regular and OT hours, and shift count.

Compute BMI from height and weight with pediatric context notes.

Illustrative mg and optional liquid volume from mg/kg and concentration.

Estimated due date from last menstrual period (Naegele-style).

Check classic ABO/Rh red blood cell donation compatibility.

Cubic yards of mulch from bed area and depth.

Cubic yards of concrete for a rectangular slab.

Tile count for a rectangular floor with square tiles and waste.

Bags needed from lawn size and label coverage.

Rolls needed from wall area and roll coverage.