About CostWise Calculator
A small independent project about money, habits, and the quiet decisions that shape both.
Why CostWise exists
Most of us don't overspend on big things. We overspend on the small ones — the second food delivery this week, the subscription nobody remembers signing up for.
The weekend that somehow cost $180. The "small treat" that quietly became a routine. These tiny choices add up faster than any budgeting app can keep up with.
CostWise started from one frustration: personal-finance advice is either too vague to act on, or too heavy to bother with. We wanted something in between — small, honest tools that answer one real question at a time.
What makes CostWise different
Built for everyday people who want clarity — not another spreadsheet or sales funnel.
Real-Life Calculators
Built around everyday decisions — not textbook finance scenarios.
Honest Comparisons
Designed to show real costs, not marketing promises or sales pitches.
No Signups Required
Use every tool instantly — no account, no email, no friction.
Simple Explanations
Clear numbers and plain words. Zero finance jargon.
What we cover
Everything on the site is built around modern, real-life money situations — the kind of spending that rarely shows up in traditional finance guides.
Browse the full list of categories on the homepage.
Who builds these calculators, and how
CostWise Calculator is an independently owned and self-funded site. It is not affiliated with any energy supplier, car manufacturer, bank, insurer, gym, salon, or subscription service, and no company pays to appear in, or be favoured by, any calculator on this site.
Every tool is built the same way. We start from a question people actually ask, write the arithmetic out in plain English on the page itself, and anchor the default values to published data — the U.S. Energy Information Administration for electricity prices, the Bureau of Labor Statistics for wages and household spending, the EPA and Department of Energy for vehicle figures, and so on. Every calculator lists its own formula, its assumptions, the source of each default, and the situations where it will give you a misleading answer.
Nothing is presented as a forecast. These are estimates built from stated assumptions, and we would rather tell you where a tool breaks down than pretend it does not.
Pages are updated when the underlying data, the method, or the explanation changes. The date shown on each calculator is the real date its content last changed — not a rolling timestamp designed to look fresh.
Built with you in mind
No tracking your inputs. No upsells. No hidden agenda.
Your numbers stay yours
Every calculation happens right in your browser. We never see what you type.
No paywalls
Every tool is free to use. Ads quietly keep the lights on, nothing more.
Built for real life
Designed around the small decisions that quietly shape your monthly spending.
A note on advice
Our tools give you estimates, not personalized financial advice. They're great for perspective and gut-checks. For the bigger stuff — buying a home, paying down serious debt, planning retirement — please talk to someone qualified.
Explore the calculators
Pick a question that's been on your mind — and get an honest answer in seconds.
Browse all toolsSpotted something off? Get in touch.