Free · Private · Instant
Free online calculators that keep it simple.
Answers as fast as you can type.
Every calculator here runs entirely in your browser — nothing is sent to a server, so results appear as you type and keep working offline once the page has loaded. The collection covers building materials like concrete, gravel and mulch, student grades with the GPA and CGPA calculators, everyday money questions like a tip or a discount, and odds and ends such as the aspect ratio calculator. No sign-up, no ads in your way, and no tracking.
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Design
Aspect Ratio Calculator
Find a ratio from pixel dimensions, or resize without distortion.
Education
Attendance Calculator
How many classes can you still miss?
Health
BMI Calculator
Calculate your Body Mass Index for adults 20+, with a healthy weight range and optional Asian BMI cutoffs.
Education
CGPA Calculator
Average your semesters into one CGPA.
Financial
Compound Interest Calculator
Project how savings or investments grow with compound interest — including monthly contributions and yearly, half-yearly, or quarterly compounding.
Construction
Concrete Calculator
How much concrete for a slab, footing, or column?
Shopping
Discount Calculator
Find the sale price and your real savings — including stacked coupons and sales tax, which flat percent-off math gets wrong.
Education
GPA Calculator
Your grade point average, on the 4.0 scale.
Landscaping
Gravel Calculator
Gravel by the yard, ton, or bag.
Finance
GST Calculator
Add GST to a price, or take it back out.
Landscaping
Mulch Calculator
Mulch by the yard and by the bag.
Home Improvement
Paint Calculator
How many gallons will the room take?
Math
Percentage Calculator
Percentages, four ways.
Games
Pokemon Type Chart
Check any type matchup with the classic battle UI.
Landscaping
Sand Calculator
Sand by the yard, ton, or bag.
Financial
Simple Interest Calculator
Calculate simple interest and total payoff for loans and short-term investments, entering time in years, months, or days.
Financial
Tip Calculator
Work out the tip, total, and per-person split for any bill in real time.
Landscaping
Topsoil Calculator
How much topsoil does your bed need?
Coming soon
More calculators coming soon
We're building out the collection — check back for new tools.