Calculo: Equation Calculator

Calculo is a smarter way to calculate.
Instead of punching buttons, you type. Math, notes, and answers — all on one screen, in plain language.
Type 100 USD to EUR and get today's live exchange rate. Type x = 5 and use x in every line that follows. Type 15 kg to lbs and convert instantly. Calculo reads what you write and evaluates it — line by line, as you type.

WHAT YOU CAN DO
Math that reads like writing
Type expressions naturally — 2 + 3, sqrt(144), 2^10 — and see results appear instantly, right beside your text.
Unit conversion — 213 units
Weight, length, temperature, volume, speed, data, duration, angles, and more. Just write 5 miles to km or 98.6°F to celsius.
Real-time currency conversion
180+ currencies with live rates. Convert with symbols, names, or ISO codes — $500 to ¥, 420 EUR to GBP, or 100 rubles to usd.
Variables
Store values and reference them by name. Write tax = 0.2, then price + price * tax — Calculo handles the rest.
Templates
Build reusable calculation sheets with editable inputs and live outputs. Tap Play, fill in the numbers, get the answer. Perfect for recurring tasks: VAT, mortgage, tip splits, unit costs.
Graphs
Visualize arrays as line graphs directly on the canvas. Define a range, write an expression, see the curve.
Organized notes
Create multiple notes, organize them into folders, and search across everything. Your calculation history lives where you left it.

FREE — NO REGISTRATION REQUIRED
Download and start calculating immediately. No account needed.

Notepad calculator with inline results
Unit conversion — 213 units
Real-time currency conversion — 180+ currencies
Variables and natural language input
A single saved note

PREMIUM — UNLOCK EVERYTHING

Unlimited notes — no cap, ever
Templates — build and run reusable calculation sheets
iCloud sync — seamlessly across iPhone, iPad, and Mac
Face ID lock — protect sensitive notes with biometric security
Custom color themes — personalize syntax highlighting to your taste

Try Premium free for 7 days. Cancel anytime.

WORKS ON
iPhone · iPad · Mac
Home screen widget included.

Subscription info
Premium is available as a monthly or annual subscription. Payment is charged to your Apple ID at confirmation. Your subscription renews automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel anytime in your Account Settings. Any unused portion of a free trial is forfeited upon purchase.
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