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CalcHub
32 free calculators with dark mode, voice input & PDF export
The only calculator site with dark mode, voice input, compare mode, and offline support. 32 calculators (EMI, SIP, tax, BMI, calorie, scientific & more) with 37-currency auto-detect. Works worldwide. Share calculations via URL. 100% free, no signup.
Hi Product Hunt! 👋
I built CalcHub because existing calculator sites look like they're from 2005 and none of them work well globally.
What makes CalcHub different:
🌙 Dark mode (zero competitors have this)
🎤 Voice input — say "five thousand" to fill fields
📊 32 calculators across Finance, Health, Math, Utility
💱 37 currencies auto-detected from timezone
⚖️ Compare mode — side-by-side scenarios (EMI 15yr vs 30yr)
📥 PDF + CSV export on every calculator
🔗 Shareable URLs with pre-filled values
📴 PWA — works offline, installable on mobile
⌨️ Keyboard shortcuts (Esc=reset, Ctrl+S=share, Ctrl+P=PDF)
📚 Calculation history saved in browser (no signup)
🌍 Works worldwide — auto-detects country/currency
All 32 calculators:
Financial: EMI, SIP, Mortgage, Compound Interest, Income Tax (India/US/UK), GST/VAT, Salary, Currency, Retirement, Loan Eligibility, Savings Goal, Investment, Inflation, CAGR, Break-Even, Profit Margin
Health: BMI, Calorie/TDEE, Pregnancy Due Date, Body Fat, Water Intake, Heart Rate Zones
Math: Percentage, Discount, Scientific Calculator
Utility: Age, Tip, Fuel Cost, Date, Time Zone, GPA, Unit Converter
No signup. No limits. No paywalls. Monetized through ads only.
Would love feedback — which calculator should I build next?
About CalcHub on Product Hunt
“32 free calculators with dark mode, voice input & PDF export”
CalcHub was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #69 on the daily leaderboard. The only calculator site with dark mode, voice input, compare mode, and offline support. 32 calculators (EMI, SIP, tax, BMI, calorie, scientific & more) with 37-currency auto-detect. Works worldwide. Share calculations via URL. 100% free, no signup.
On the analytics side, CalcHub competes within Productivity, Developer Tools and Finance — topics that collectively have 1.2M followers on Product Hunt. The dashboard above tracks how CalcHub performed against the three products that launched closest to it on the same day.
Who hunted CalcHub?
CalcHub was hunted by Atul Verma. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of CalcHub including community comment highlights and product details, visit the product overview.
Atul Verma