Free, transparent calculator tools for real people
Oregon Calc is operated by Weird City Enterprises LLC, a small business based in Gresham, Oregon. We build free online calculator tools for renters, truckers, contractors, small business owners, and anyone who needs quick and accurate financial, legal, or construction estimates.
We started Oregon Calc because we were frustrated by the calculator sites already out there. Most were loaded with pop-ups, required email sign-ups, or hid their formulas behind vague explanations. We wanted tools that were fast to load, transparent about the math, and completely free to use with no strings attached.
Every calculator on Oregon Calc follows three principles. First, transparency: we show you the exact formula and step-by-step breakdown for every calculation, so you never have to wonder where a number came from. Second, accuracy: we source our data from official government publications, current tax brackets, and applicable state statutes, and we update our tools whenever rates or laws change. Third, simplicity: our tools run entirely in your browser with no downloads, accounts, or hidden fees.
We currently offer calculators for Oregon pro-rated rent, Washington pro-rated rent, trucking fuel cost per mile, Oregon small claims court, concrete estimation for contractors, Oregon take-home pay, Washington take-home pay, self-employment quarterly taxes, IFTA fuel tax, and LLC formation costs by state. We add new tools regularly based on what our users ask for.
Oregon Calc is a free service supported by Google AdSense advertising and affiliate links. When you see an affiliate recommendation on one of our pages, it means we may earn a small commission if you click through and make a purchase. These partnerships never influence our calculations, formulas, or recommendations. The math is the math, and we keep it separate from how we pay the bills.
We are committed to keeping all of our tools free. If you find our calculators helpful, the best way to support us is to share them with someone who could use them or bookmark the site for your next calculation.
While we work hard to keep our calculators accurate and up to date, they provide estimates only. Tax laws change, court fees are adjusted, and material costs fluctuate. Our tools are not a substitute for professional legal, tax, or financial advice. Always verify important calculations with the relevant official sources, and consult a qualified professional for decisions that affect your finances or legal standing.
If you believe any of our calculators contains an error, please contact us immediately. We take accuracy reports seriously and will investigate and correct any confirmed issues as quickly as possible.
Tax Calculators: Federal tax brackets from the IRS (Revenue Procedure 2025-11). Oregon tax rates from the Oregon Department of Revenue. Washington state does not levy an income tax; WA Cares Fund rates from the Washington Employment Security Department.
Legal Calculators: Oregon small claims court fees and rules from the Oregon Judicial Department. Landlord-tenant rules from Oregon Revised Statutes Chapter 90 and Washington RCW 59.18.
Construction Calculators: Concrete volume formulas follow standard engineering calculations. Waste factors based on industry standards from the Portland Cement Association.