Skip to content
New · 100+ calculators planned

Calculate anything
in seconds.

Fast, accurate and beautifully designed calculators for students, professionals and everyday use. No clutter, no ads in the way — just tools that work.

Start calculating
  • No sign-up
  • Works offline
  • Privacy-first
  • Free forever
percentage.calc

Live preview · Percentage

% of

Result

170

20% of 850 = 170

Open the full calculator

Popular

The tools people actually reach for.

Browse

Find a calculator by category.

Why OurDailyCalc

Designed for the modern web.

Every detail — from typography to keyboard shortcuts — is engineered to feel like the software developers actually want to use.

Built for speed

Astro-powered, statically generated, zero JavaScript by default. Pages load instantly and stay snappy even on slow connections.

Designed, not assembled

A coherent design system across every tool — typography, spacing, motion. No two calculators look like they came from different websites.

Works everywhere

Mobile, desktop, tablet, low-bandwidth, offline-first. Install as a Progressive Web App or share calculations via permalinks.

Accurate by design

Every formula is documented and sourced. Results are deterministic, transparent, and verifiable on every calculator page.

Keyboard-first

Hit ⌘K from anywhere to search calculators, conversions, and articles. Built like a developer tool, not a 2010 web page.

Yours forever

Save favourites, view recent activity, export results as PNG, PDF or copy text. All data lives on your device, not ours.

Blog

Read up on the math.

Questions, answered.

Everything you need to know about OurDailyCalc.

Are OurDailyCalc calculators free to use?
Yes — every calculator on OurDailyCalc is completely free, with no sign-up required. We support the platform through unobtrusive ads and may offer optional premium features in the future.
How accurate are the results?
All formulas are implemented from authoritative sources (WHO for BMI, standard reducing-balance for EMI, ISO units for conversions). Each calculator page documents its formula and method so you can verify it yourself.
Do you save my calculations?
Calculations stay on your device — they are stored in your browser via localStorage so you can pick up where you left off. Nothing is sent to our servers.
Can I use OurDailyCalc on mobile?
Yes. Every calculator is responsive, touch-optimised and works offline once visited thanks to our Progressive Web App support.
Will more calculators be added?
Absolutely. OurDailyCalc is built to scale to 100+ calculators. New tools ship regularly — see the Coming Soon labels on the Calculators page for what is next.

Stop hunting for calculator websites.

Bookmark OurDailyCalc and you have the math covered — every day, on every device.

Open a calculator