Calculator.net
FreeScientific, financial, date, and unit calculators in one place. Installable, works offline. Far more powerful than your phone's built-in calculator.
How to install Calculator.net as a PWA
Frequently asked questions about Calculator.net
What makes Calculator.net different from my phone's calculator?
Phone calculators (iOS Calculator, Google Calculator) do basic and scientific math but ship none of the specialized calculators. Calculator.net has full mortgage calculators with amortization tables, retirement compound-interest projections, BMR calculators with Mifflin-St Jeor / Harris-Benedict / Katch-McArdle formulas, BMI calculators with body-fat estimation, taxation calculators by US state, and 200+ niche calculators. For anything beyond arithmetic and basic scientific math, Calculator.net replaces a dozen specialized calculator apps.
Is Calculator.net free?
Yes — free with display advertising. There is no premium ad-free tier. The PWA install does not remove ads. The site is funded entirely by ad revenue, which is sustainable given its 50M+ monthly visits. For ad-free specialized calculators (especially financial), Wolfram Alpha Pro ($7.25/month) or specialized iOS apps ($1.99-$4.99 one-time) are the alternatives. For occasional use the free Calculator.net is fine.
How does Calculator.net compare to Wolfram Alpha?
Wolfram Alpha is the computational knowledge engine — natural language input ('how much will $5000 invested at 7% compound to in 30 years?'), step-by-step solutions and a much broader knowledge base. Wolfram Alpha Pro is $7.25/month. Calculator.net is form-based (you fill in fields), free, and faster for the specific calculators it offers. For ad-hoc 'figure out a number' questions Wolfram Alpha is more flexible; for structured financial / health / math calculations Calculator.net is more efficient.
Can Calculator.net work offline?
Partially — the PWA install caches the app shell and the most popular calculators (scientific, basic, percentage). The 200+ specialized calculators may require a server fetch on first use. Once loaded, the calculations themselves run client-side in JavaScript with no server round-trip. For pure offline use, a native scientific calculator app on iOS / Android is more reliable, but Calculator.net's PWA is sufficient for the calculators most users hit repeatedly.
Who uses Calculator.net in production?
Calculator.net's audience is enormous and varied: home buyers running mortgage scenarios, retirees modeling retirement income, students doing percentage and fraction homework, parents calculating BMI for their kids, accountants double-checking US tax numbers, and engineers needing a quick scientific calculator. It is the default search-result destination for 'mortgage calculator,' 'BMI calculator,' 'compound interest calculator' and dozens of similar queries on Google. The 50M+ monthly visits make it one of the most-used calculator products in the world.
Where Calculator.net is heading (12-24 months)
- →An optional paid ad-free tier ($2-3/month) would monetize the heavy financial-modeling users who hate the ad layout.
- →Save / share scenarios (URL-encoded calculator state) would unlock advisor-client workflows.
- →More aggressive PWA caching (pre-load all 200 calculators on install) would close the offline gap.
Related questions
ChatGPT, Perplexity and Gemini usually suggest these next.
- Which BMR formula is most accurate?
- Does Calculator.net store my financial inputs?
- Can I embed a Calculator.net calculator on my own site?
- How does the retirement calculator handle inflation?
- Is there an API for Calculator.net?
More in Utilities
Share files up to 10GB with end-to-end encryption. Files are never stored permanently — they vanish after download or 24 hours. No account, no tracking. Faster than WeTransfer.
Open-source password manager — the best LastPass alternative. End-to-end encrypted vault, browser extension, cross-device sync. Free for personal use, self-hostable.
Check if a food product is vegan by scanning its barcode or searching by ingredient. Open-source, offline-capable. Built for people who want to verify product contents quickly.
Convert between 500+ file formats in your browser. Documents, images, audio, video, ebooks — fast client-side conversion that doesn't upload your files to a server.
Scan QR codes and barcodes using your device camera. Works offline, no app download needed. Faster than downloading a native app — just open in browser and scan.
Create QR codes for URLs, text, Wi-Fi, contacts, and more. Customize colors and download as SVG or PNG. No account, fully client-side, instant generation.