A calculator for the way you work
The math changes from one job to the next: a contractor turns a room into tiles and a quote, a caterer scales a menu to a guest list, an investor checks how long a balance takes to double. Each page below works through the calculations one kind of work actually does, with the answers Notes Calculator shows and a link that opens each example in the app.
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Students and Teachers
Weighted grades, the score you need on a final, physics with named values, unit conversions, test percentages and class averages.
Calculator for students and teachers -
Freelancers
Fixed-price quotes from hour estimates, tracked time, a tax set-aside, photo storage per shoot and package fees in another currency.
Calculator for freelancers -
Small Businesses and Accountants
Shop owners, accountants and recruiters: markup versus margin, sale prices, VAT out of a gross price, depreciation and placement fees.
Calculator for small businesses and accountants -
Contractors and Tradespeople
Carpenters, painters, tilers, plumbers, electricians, mechanics and welders: areas and waste, stock lengths, voltage drop and marked-up quotes.
Calculator for contractors and tradespeople -
Landscapers and Farmers
Lawns, beds and fields: areas in square feet and acres, mulch volumes, seed by the acre, cost per acre and planting or mowing quotes.
Calculator for landscapers and farmers -
Caterers, Bakers and Event Planners
Recipes scaled to the order, baker's percentages, cost and price per head, drinks for the bar and event budgets with service and tax.
Calculator for caterers, bakers and event planners -
Landlords and Homebuyers
Down payment and loan size, the monthly mortgage payment, the full monthly cost of owning, rental cash flow, yield and rent increases.
Calculator for landlords and homebuyers -
Investors and Traders
Compound growth, monthly contributions, the Rule of 72, position sizes from risk, reward to risk and a running profit and loss.
Calculator for investors and traders -
Trainers, Nutritionists and Nurses
Kilos and pounds, one-rep max estimates, macro splits, daily intake totals, IV flow rates in mL/h and shift hours.
Calculator for trainers, nutritionists and nurses -
Travelers
Budget left per day, tips and bill splits, road trip fuel costs and everyday conversions for kilometers, Celsius and baggage weight.
Calculator for travelers -
Engineers
Named values, built-in pi, SI shorthand such as 50k, stress and electrical power, and results that keep their units.
Calculator for engineers -
Developers
API cost at your traffic, storage across users, hex and binary conversions and SLA downtime budgets, written like pseudocode.
Calculator for developers
Looking for one task rather than a kind of work? See the freelance invoice calculator, the multi currency calculator for travelers and the engineering unit converter, or browse the guides on the blog.
Bring your own numbers.
Notes Calculator is free with one note, in your browser and on macOS, Windows, Linux, iOS and Android. Lifetime adds unlimited notes and sync.
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