1001 Pro Calculators and Tools

OneAppCompany Limited

In-app purchases

About this app

1001 Pro Calculators and Tools. Privacy first: no ads, even on the free 250 calculators. Works offline.
From Take-home Pay, Monthly Budgets and Mortgage Comparison to BMI, income tax, loan EMI, VAT, unit converter, concrete, macros and GPA. Feet and inches, conduit fill, duct sizing, superheat. Price a job and send the quote from your phone.
Most calculator apps give you fifty tools and bury them in adverts. This one gives you 1001 and shows none.
▸ TRADE TOOLS — BOUGHT ONCE, KEPT FOR GOOD
The instrument for a trade, in that trade's own notation. One purchase opens all ten tool sets — nothing to renew, a year of Pro included.
• Construction calculator: feet and inches, stairs, roofs, layout, take-off
• Plumbing calculator: pipe, offsets, flow, pressure, drainage
• Electrical calculator: cable, conduit fill, voltage drop, motors
• HVAC calculator: ducts, airflow, superheat, subcooling
• Machining, Welding, Automotive, Landscaping, Painting and Reference. 133 solvers.
Every solver cites what governs the work and who may lawfully do it.
▸ PROJECT MAKER — QUOTES, INVOICES, ESTIMATES
Quote a job in five minutes. Quotation, estimate or invoice on your letterhead, with customer details, your own job reference and dates. Itemised table: description, quantity, rate, amount. Totals split materials from labour, tax at its rate. Terms and a signature block.
Photograph the work, from camera or library, onto the document. Send as a PDF, or an image straight into WhatsApp, email or a message.
▸ TIME-SHEET — HOURS TO TAKE-HOME PAY
Any period — a day, a week, a fortnight, a full month. Hours per day, paid and unpaid breaks. Gross pay, tax, pension, other deductions, net pay. Pension by salary sacrifice, before or after tax. Tax code or flat rate.
Exports as a signable timesheet PDF: dated grid, ruled total, pay summary, signature lines.
▸ SIDE-BY-SIDE COMPARISONS
Two options, two columns, one answer. Mortgage Deals Comparison · Compare Two Loan Offers · Compare Two Job Offers · Renting or Buying · Interest-Only vs Repayment
▸ GRAPHS & CHARTS
Sweep any input and watch the answer move — payment against interest rate, 4% to 7%. Mortgage balance across the term. Amortisation schedules as PDFs.
▸ THREE CALCULATOR KEYPADS
Basic · Scientific · Fraction — whole numbers and fractions kept exact, never turned into a decimal and back. Memory keys, and a history you tap to reuse an answer.
▸ BUDGET PLANNER
Money in, money out, what is left. A budget statement as a PDF or CSV.
▸ EXPORT
Any calculator result as a PDF page or CSV row — every input and output, checkable later.
▸ EVERYDAY
Monthly Mortgage Payment · Compound Interest · Zakat · Daily Calorie Needs (TDEE) · Macronutrient Split · Percentage of a Number · Age Calculator · Tip & Bill Split · Shoe Size · Paint Coverage · Tile Quantity · length, weight, temperature and volume converters
▸ BUILT PROPERLY
No adverts, free or Pro. Fully offline. Exact arithmetic, not rounded floating point, tested against published worked examples, with the working shown. Nothing you type is sent anywhere.
▸ TWO WAYS TO PAY, AND NEITHER IS A TRAP
Pro, yearly — all 1001 calculators, unlimited saved calculations and bookmarks, project maker, budget planner, unlimited PDF and CSV export. Starts with a free week through Google Play.
Trade Tools, once — every trade tool kept for good, a year of Pro included.
250 calculators stay free for good across all 28 categories — no account, no sign-in.
▸ WHO IT IS FOR
Builders, plumbers, electricians and HVAC engineers — the tool for the trade, then quote the job in the same app. Farmers costing inputs, land and livestock. Contractors and shift workers on the timesheet calculator. Landlords on the mortgage ones. Students, nurses, drivers and cooks on the other thousand.
Arithmetic, not advice. Rates and tax bands vary by country and change. Nothing here is a certificate or a sign-off. Check anything you act on with the body that sets it.

What’s new

Welcome to 1001 Pro Calculators and Tools.

• 1,001 calculators across 28 categories, 250 of them free, each showing its working.
• Worksheets for real work: Project Maker for quotes, Budget Planner and Timesheet.
• Trade Tools for every trade, in one purchase.
• Try everything free for 7 days.
• Works fully offline. No signal or Wi-Fi needed.
• No adverts and no account. Your figures never leave your phone.

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