Tools for real-world decisions
Practical calculators.
Straight answers.
Useful, transparent calculators for everyday decisions. See the math, get your number, move on.
Right here, right now
Quick math,
right here.
Basic and scientific tools, ready on the page. No search, no download.
Every formula is shown.
Every result is yours.
Start here
The six you’ll reach
for first.
Food & Catering
Recipe Scaling Calculator
Scale a recipe, convert supported weights and volumes between US and metric, and scan a photo to fill in the ingredient list.
Home Improvement
Paint Calculator
Estimate gallons of paint for a room, including doors, windows, and coats.
Finance
Mortgage Calculator
Estimate your monthly mortgage payment, including taxes and insurance.
Events
Wedding Food Calculator
Estimate wedding food quantities and a rough catering budget range.
Food & Catering
BBQ Meat Calculator
Work backward from servings to the raw meat weight you need to buy.
Everyday Life
Tip Calculator
Work out the tip, the total, and what each person owes — with optional rounding.
Free account
Your toolkit, one click from home.
Star the calculators you actually use and they wait for you here — and your last 20 calculations stay saved, ready to reopen with the numbers you used. Free, no card, no spam, nothing to cancel.
The library
Find your
category.
A growing reference shelf for food, home, business, and everyday planning.
No nonsense by design
Tools should get out of the way.
Clear inputs. No jargon, no account walls, no mystery fields.
Visible math. See the formula and the assumptions behind every estimate.
Useful output. Copy it, print it, or share the exact result with someone else.