The logic behind
every decision.
221 free calculators for small businesses, freelancers, growers and curious minds alike. From freight and payroll to irrigation and game economies — all free, all instant, nothing to sign up for.
Browse All 221 Tools →How it works
No account. No confusing wizard. Just enter your values and get the answer.
Pick a Tool
Browse 221 calculators across 10 categories. Use the grid below or jump straight to a specific domain.
Enter Your Numbers
Plug in your inputs — rates, amounts, time periods, margins. Every field is labeled with what goes in and why.
Get Your Answer
Results update in real time. No submit button. Copy the output, bookmark the tool, or explore related calculators.
Not another AI-generated tool pile.
CoreLogic started with a simple frustration: why do the numbers you need for everyday work live in spreadsheets, expensive software, or buried behind paywalls?
So we built them ourselves — 221 calculators grounded in published formulas, each one checked against a second reference before it goes live, and each one showing you the calculation instead of hiding it in a black box.
Whether you are pricing a shipment, sizing an irrigation system, working out a take-home estimate or modelling a game economy, the logic should be solid — and you should be able to see where it comes from.
CoreLogic is an independent reference site written and maintained by Nathan Cole. Our calculators are for general information only and are not professional, financial, tax or legal advice — see our Disclaimer.
Small Business & Freelance
Freelancers, contractors and shop owners working out margin, hourly rates, break-even units, freight and landed cost.
Tax & Take-Home Pay
Employees and self-employed filers estimating take-home pay, VAT and tax brackets. Educational estimates only — not tax advice.
Farmers & Growers
Growers calculating irrigation requirements, orchard density, livestock gestation, soil amendments and greenhouse conditions.
Game & Economy Builders
Players and designers working out inflation rates, raid damage, token earning curves and arbitrage spreads.
Real problems. Real tools.
Every calculator is tied to an actual use case, not just a formula pasted into HTML.
Business & Trade
Margin, average selling price, break-even units, freight class, LCL shipping cost, DDP landed cost, Amazon FBA freight.
Finance & Tax
VAT, tax brackets, self-employment tax, gross-to-net salary, simple interest, commission, insurance deductibles.
Agriculture & Environment
Irrigation requirement, row spacing, soil pH, pasture carrying capacity, orchard density, carbon levy impact.
Education & Math
GPA and cumulative GPA, class rank, percentile, test scores, logarithms, exponents, geometry.
Lifestyle & Everyday
Cooking conversion, dough hydration, egg timer, laundry detergent, walking distance, light bulb savings.
Gaming & Virtual Economy
Game economy inflation, dragon raid damage, in-game arbitrage, guild ranking points, season duration.
48 Featured Tools
A selection from our full library of 221 calculators.