Profit margin
See exactly what percentage you earn on each order.
Business
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15 tools·7 categories·Updated daily
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Break-even point
How many units you must sell to cover fixed costs.
Business
Discount
The price after a discount, and what you actually save.
Sales
VAT
Split tax out of a price, or add it on top.
Tax
Commission
Affiliate commission or marketplace fees as a share of revenue.
Sales
Return on investment
Measure the ROI of a spend — an ad budget, for example.
Marketing
Percentage
Everyday percentages: increase, decrease, and ratio between two numbers.
Utilities
Markup
Turn cost price and target markup into a list price.
Business
Profit
Revenue minus costs — what you actually keep.
Business
Loan
The repayment due each period on a business loan.
Finance
Compound interest
How a balance grows when interest is reinvested.
Finance
Savings
How much to set aside each month to hit a goal.
Finance
Salary
Convert between hourly, monthly and yearly pay.
People
Time card
Add up hours worked in a period to calculate pay.
People
Percentage change
How much this month rose or fell against the last.
Utilities
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Sales
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Tax
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Marketing
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Utilities
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Finance
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People
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- Utilities
Percentage change
How much this month rose or fell against the last.
- People
Time card
Add up hours worked in a period to calculate pay.
- People
Salary
Convert between hourly, monthly and yearly pay.
- Finance
Savings
How much to set aside each month to hit a goal.
- Finance
Compound interest
How a balance grows when interest is reinvested.
- Finance
Loan
The repayment due each period on a business loan.
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Frequently asked questions
Quick answers to common questions, gathered in one place.
What is Kolo and how does it work?
Kolo gathers the small calculators that sellers and small business owners reach for every day: profit margin, break-even, tax, commission. Each one runs straight in your browser with nothing to install.
How do I submit my own tool?
Tool submissions are not open yet. For now the catalogue is picked and checked by the team, so every tool works on the spot instead of being one more list of links.
How is the catalogue reviewed?
Every tool is tried by hand before it is added: it has to work, it has to give correct results, and it has to belong in a seller’s real workflow. Tools that fail any of those do not make the list.
Do I need an account to use it?
No. Every tool is open to everyone with no sign-in. An account is only needed if you want to save tools, build collections, or use the wallet payment feature.