Instacalc.com

Is a pocket calc too simple? Excel too much? Enter instacalc, the calc/spreadsheet sweet spot.
Here's what users have to say:
“I bleepin' love this site and I use it all the time. I especially love the simple variables and conversions.”
“For quick ad-hoc calculations I like instacalc.com because: It's quick to write. It's free. It's less prone to mistakes and easier to check than Excel.”
“An astonishing mixture between a simple calculator and a spreadsheet application.”
Instacalc lets you...
* Crunch numbers while seeing results in real-time
* Use natural language (250k + 25%)
* Use variables (profit = sales - cost)
* Use excel-style functions (SUM, AVG, PMT...)
* Use scientific and programming commands (trig, hex/bin, logical operators, if/else...)
* Share a calc permalink with anyone (no login)
* Use units (meters/feet, etc.) and currency, along with custom units
* Dozens of more features (see below)
If you login (free), the app syncs with the main instacalc.com website. Welcome to your new, favorite calculator.
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Here's a few more details on features:
- Flexible Arithmetic: Easily manage calculations from "2 + 2 - 3" to complex expressions like "(3 * 5) / 2".
- Instant Roots and Powers: Compute roots and powers in a snap, from "sqrt(9)" for square roots to "5^2" for exponents.
- Master Percentages: Effortlessly calculate percentages, whether it's "5%", finding "17% of 200", or calculating "20 + 50%".
- Modulo Operations: Solve "5 mod 3" quickly, perfect for programming and mathematical proofs.
- Number Shortcuts: Speed through large numbers with shortcuts like "3.3k" or "200 million".
- Scientific Notation Made Simple: Work with large values using entries like "1.234e3" or as simple as "1e-3".
- Dynamic Variables & Rows: Create and manipulate variables "x = 9", and perform calculations across rows to streamline data analysis.
- Comprehensive Unit Conversions: Convert "15 feet into inches" or complex rates like "15 miles/hour into feet/second".
- Time and Date Wizardry: Calculate durations like "3 days in minutes" or perform timezone conversions "8pm PST in EST".
- Advanced Financial Calculations: From loan payments using "PMT(rate, nper, pv)" to calculating the internal rate of return with "IRR(values)".
- Statistical Tools: Analyze data using functions for variance "var(r1:r3)" or standard deviation "stddev(r1:r3)".
- Trigonometry and Logarithms on the Go: Solve "sin(30)" or "log(2)" for both educational and professional uses.
- Programming Made Easy: Tackle binary operations "bin(a = 3) and bin(a and b)", logical comparisons "2 * 2 > 3", and conditional statements.
- Real-Time Financial Insights: Convert currencies "15 USD in EUR" and check real-time stock prices with "STOCK(AAPL)".
Use Instacalc today and transform the way you handle calculations, whether for work, study, or daily life!