Drug Accountability

Investigational Product (IP) Compliance Calculator

Quick Disclaimers

  • For simple data entry aid for countable drug units (pills, tablets, patches, etc.). Not for liquids measured by volume.
  • Verify all calculations and protocol.
  • NO PHI. Not for medical advice.
  • See 'About' tab for full disclaimers.

Creatinine Clearance (CrCl)

Using the Cockcroft-Gault Formula

Quick Disclaimers

  • For estimating adult creatinine clearance. Not intended for pediatric patients or those with unstable renal function.
  • Verify all calculations. This tool is not a substitute for clinical judgment.
  • NO PHI. Not for medical advice or diagnosis.

Visit Window Calculator

Calculate Date Ranges for Study Visits

Reminder!

Cycles are typically based off the C1D1 date, not the last visit date. However, for infusion drugs or others with minimum requirements between administrations, the next cycle may be based on the last infusion date. Always refer to your study protocol.

Date Calculator

Quickly add days to a start date

Example

If a patient's C1D1 is today and the next cycle begins in 21 days, this calculator will find the C2D1 date. Simply enter today's date and "21" in the days-to-add field.

Unit Converter

Common conversions for clinical research

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About The CRC Toolkit

The CRC Toolkit is a collection of simple, free-to-use web tools designed to assist clinical research coordinators, site staff, and other professionals with common calculations and tasks encountered in clinical trials. The primary goal is to provide quick, accessible, and reliable support for data entry and verification, helping to streamline daily workflows.

All tools are designed to work entirely within your browser. No personally identifiable information (PII) or protected health information (PHI) is ever collected, stored, or transmitted.

For questions or suggestions, please contact us at ask@thecrctoolkit.com.

Important Disclaimers & Terms of Use

  • For Informational & Data Entry Aid Purposes Only: These tools are intended solely for simple data entry assistance and informational purposes within the context of clinical research.
  • Not for Medical Advice: The information and calculations provided should NOT be considered medical advice or used for making clinical decisions. Always consult with qualified healthcare professionals and refer to the study protocol for any medical or treatment-related guidance.
  • No Protected Health Information (PHI): Users must NOT enter any PHI or any other sensitive personal data into these calculators.
  • Independent Verification Required: All calculations and outputs MUST be independently verified by the user against source documentation, study protocols, and applicable Standard Operating Procedures (SOPs).
  • Limitation of Liability: You use our site, services, and tools at your own risk. We take no responsibility for any losses, damages, or problems arising from your use of this toolkit. This includes, but is not limited to: loss of profits, inaccuracies in calculations or content, work stoppage, errors, unauthorized access, loss of data, personal injury, or property damage. While we strive for accuracy and will attempt to fix reported problems, we do not warrant that the service will be error-free or uninterrupted, and we accept no responsibility for any losses caused by reliance on the information provided.
  • Compliance with Regulations and Protocol: Use of these tools does not replace or supersede any regulatory requirements (e.g., FDA, EMA, ICH GCP), institutional policies, or specific study protocol directives.

Resources for Clinical Research Professionals

The following resources provide valuable information on drug accountability, Good Clinical Practice (GCP), and regulatory guidelines relevant to clinical trials.

Key Regulatory Bodies & Guidelines

Professional Organizations

This page is intended to provide starting points for further information. Always prioritize official regulatory documents, study-specific protocols, and your institution's SOPs.

Privacy Policy for The CRC Toolkit

Last Updated: October 17, 2025

Introduction

Welcome to The CRC Toolkit ("we," "us," or "our"). We are committed to protecting your privacy. This Privacy Policy explains how we handle information when you visit and use our website and its tools, including the Drug Accountability Calculator (the "Service").

By using the Service, you agree to the collection and use of information in accordance with this policy.

Information We Do Not Collect

Our Service is designed with your privacy as a priority. We do not require you to create an account, and we do not collect, store, or transmit any personally identifiable information (PII) or Protected Health Information (PHI) that you enter into the calculator fields. All calculations are performed within your browser and the data you enter is not saved by our servers.

Information We Collect Automatically

Like many site operators, we may collect information that your browser sends whenever you visit our Service ("Log Data"). This Log Data is anonymous and may include information such as your computer's Internet Protocol ("IP") address (often anonymized or truncated), browser type, browser version, the pages of our Service that you visit, the time and date of your visit, and other statistics. We also utilize Firebase to count the number of times the calculator is used, but this is an aggregated, anonymous count and is not tied to any individual user.

Google AdSense & Cookies

We use Google AdSense to serve advertisements on our site. Google uses cookies to serve ads based on a user's prior visits to our website or other websites. Google's use of advertising cookies enables it and its partners to serve ads to our users based on their visit to our sites and/or other sites on the Internet. Users may opt out of personalized advertising by visiting Ads Settings.

Links to Other Sites

Our Service contains links to other sites that are not operated by us (e.g., in the Resources tab). If you click on a third-party link, you will be directed to that third party's site. We strongly advise you to review the Privacy Policy of every site you visit. We have no control over and assume no responsibility for the content, privacy policies, or practices of any third-party sites or services.

Changes to This Privacy Policy

We may update our Privacy Policy from time to time. We will notify you of any changes by posting the new Privacy Policy on this page. You are advised to review this Privacy Policy periodically for any changes. Changes to this Privacy Policy are effective when they are posted on this page.

Contact Us

If you have any questions about this Privacy Policy, please contact us at ask@thecrctoolkit.com.